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Artykuły w czasopismach na temat „Diamond”

Autor: Grafiati

Data publikacji: 4 czerwca 2021

Data aktualizacji: 25 lipca 2025

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1

Lin, Guan Fu, Ming Yi Tsai, and Chiu Yuan Chen. "Development of a Combined Diamond Impregnated Lapping Plate." Key Engineering Materials 739 (June 2017): 157–63. http://dx.doi.org/10.4028/www.scientific.net/kem.739.157.

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This paper presents a combined diamond-impregnated lapping plate for single crystal silicon carbide (SiC) to improve the material removal rate due to SiC having very low material removal rate. Three different dimaond shapes were prepared: (1) "sharp," a sharp-edged diamod; (2) "blocky," a high quality crystalline diamond; (3) "oxidized diamond". The diamonds were manufactured by using high temperature heating method in a furnace to induce diamond oxidation resulting in improvement of Ra and sharpness of the diamonds. Three combined diamond-impregnated lapping plates were fabricated using the a

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2

Muhammad Basysyar, Fadhil, and Gifthera Dwilestari. "COMPARISON OF MACHINE LEARNING ALGORITHMS FOR PREDICTING DIAMOND PRICES BASED ON EXPLORATORY DATA ANALYSIS." International Journal of Engineering Applied Sciences and Technology 7, no. 5 (2022): 71–79. http://dx.doi.org/10.33564/ijeast.2022.v07i05.012.

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Diamonds are a unique commodity whose socially generated notions significantly influence perceived value. To study how a diamond's physical attributes might predict its price, a massive dataset of loose diamonds scraped from an online diamond store is subjected to data mining, which reveals that diamond weight, color, and clarity are the most influential determinants of diamond pricing. Therefore, submit a proposal for an Exploratory Data Analysis that includes a component that analyses various parts of news articles using LASSO Regression, ElasticNet Regression, and Random Forest Regression.

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3

Liu, Fu-Kang, Ying Guo, Bei Zhao, and Xiang Li. "The Color Origin and Evaluation of Natural Colored Diamonds." Science of Advanced Materials 14, no. 2 (2022): 243–56. http://dx.doi.org/10.1166/sam.2022.4210.

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Diamond is widely concerned and loved by people due to its rarity, beauty and beautiful implication in love. Color is very important in colored diamonds’ evaluation, and diamonds are extremely colorful. Scholars have done some researches on the color origin of colored diamonds, but the types of diamonds studied are not comprehensive, and the influence of these color origins on diamonds’ color evaluation has not been systematically clarified. Therefore, this paper focuses on the color of diamonds, arranges a large number of documents, and systematically summarizes and discusses the color and ev

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Borodulin, Zakhar I., Lyudmila A. Vasilyeva, Konstantin I. Smorodin, and Mikhail A. Shulepov. "Electroluminescence of nitrogen-vacancy and nickel color centers in a diamond." Tekhnologii bezopasnosti zhiznedeyatelnosti, no. 8 (2024): 52–58. https://doi.org/10.17223/29491665/8/7.

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A diamond is necessary for quantum technologies due to its unique properties and a variety of color centers. A diamond is a radiation-resistant chemically inert wideband semiconductor with the highest thermal conductivity. A diamond’s color centers can be active centers of lasers, quantum sensors, single photon emitters and qubits. In 2020, an optically pumped NV diamond laser was shown for the first time. In 2022, a quantum diamond magnetometer was demonstrated for the first time at N2V° color centers. To improve these devices, it is necessary to use electrical excitation. Electrical excitati

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5

Xu, Jingru. "Prediction on the Prices of Laboratory-Grown Diamonds based on Multiple Linear Regression Model." Highlights in Business, Economics and Management 35 (June 16, 2024): 101–7. http://dx.doi.org/10.54097/8yaq7c77.

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Diamond as emotional investment, in recent years, the market price of it is going through rising and falling, and drastic fluctuating, more is the decline in price. The diamond industry has also been challenged, there is happening oversupply and weak demand in diamond market. The impact of lab-grown diamonds on natural diamonds has also changed the price of diamonds across the diamond industry. However, the market of diamond is still at the forefront of the jewelry industry. In order to ensure that consumers have more understanding of diamond choices, this paper adopts multiple linear regressi

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6

Polushin, Nikolay Ivanovich, Alexander Ivanovich Laptev, Mariya Stanislavovna Shitareva, et al. "The use of spectroscopy methods for structural analysis of CVD diamond films, polycrystalline and single-crystal diamonds." MATEC Web of Conferences 336 (2021): 01013. http://dx.doi.org/10.1051/matecconf/202133601013.

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For the work results correct interpretation, it is important to study initial materials that scientists have to deal with. Currently, there are a large number of different diamond substrates. Comparison of materials among themselves allows you to determine which material you are dealing with. In this work, the methods of infrared (IR) spectrometry, Raman spectroscopy and spectrophotometry are used to study four types of diamond materials: diamond polycrystalline CVD-films; natural single-crystal diamonds; synthetic polycrystalline HPHT-diamonds (such as DSPC – diamond synthetic polycrystal by

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7

Seo, Jin Kyo, Jeong Hwan Lee, and Jong Wan Park. "Comparison of Natural Type Ia Diamond and CVD Diamond Films by Photoluminescence." Solid State Phenomena 124-126 (June 2007): 467–70. http://dx.doi.org/10.4028/www.scientific.net/ssp.124-126.467.

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The crystal defects in diamonds are diverse. In other words, there are almost no perfect diamonds without impurities or dislocations. Most natural diamonds contain a considerable amount of nitrogen impurity in aggregated forms. CVD diamond films also included many crystal defects. We investigated the distribution of luminescence center of natural type Ia diamonds and CVD diamond films by various photoluminescence excitation source. Photoluminescence (PL) spectroscopy is a useful technique to provide information on defects of diamond with high sensitivity.

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8

Jaskie, James E. "Diamond-Based Field-Emission Displays." MRS Bulletin 21, no. 3 (1996): 59–64. http://dx.doi.org/10.1557/s0883769400036149.

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Diamond has existed in the natural state for thousands of years. It was mainly used as a jewel for its optical brilliance and for its hardness. In the 1950s methods were developed to fabricate synthetic diamonds commercially. This greatly increased diamond's industrial use, mostly for grinding and lapping applications. Diamond is a crystalline form of carbon, a group-IV element in the periodic table. Silicon and germanium are also Group-IV elements and also have the same crystalline lattice structure as diamond. Hence there has been theoretical interest in diamond's electronic properties since

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9

Dr.A.Shaji, George. "Sustainable Sparkle: The Emergence and Impact of Lab-Grown Diamonds in India's Diamond Capital." Partners Universal Innovative Research Publication (PUIRP) 02, no. 02 (2024): 1–16. https://doi.org/10.5281/zenodo.10928216.

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Diamond cutting and polishing have historically been conducted in Surat, India, which processes the majority of raw diamonds mined around the globe. Nevertheless, conventional diamond mining is rife with environmental and ethical concerns. Lab-grown diamonds present a sustainable alternative to deep-seated diamond mining by simulating natural conditions to produce the precious stones above ground in a span of six weeks. The emergence of lab-grown diamonds in Surat and its potential repercussions are examined in this article. The paper describes the technological process by which lab-grown diam

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10

Karpovich, Z. A., E. I. Zhimulev, and A. I. Chepurov. "Growth Diamond on an Impact Lonsdaleite-bearing Diamond from the Popigai Astrobleme." Bulletin of Irkutsk State University. Series Earth Sciences 38 (2021): 41–53. http://dx.doi.org/10.26516/2073-3402.2021.38.41.

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The Popigai astrobleme contains huge reserves of diamonds with unusual properties. In impact diamonds from the Popigai astrobleme, the cubic phase and lonsdaleite are intergrown. In order to study the relationship of lonsdaleite-bearing impact diamonds with diamond, an experimental study of the features of diamond growth on lonsdaleite-bearing fragments was carried out. The experiments were carried out on a high-pressure apparatus of the “BARS” type at 5.5 GPa and 1450 ° C in the Fe-Ni-C system (nickel 36 wt.%). Impact Popigai diamonds were used as seed crystals. As a result of the study, it w

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11

Segl, Jakob, and Christian Edtmaier. "Influence of the Diamond Surface Termination on the Thermal Conductivity of Al/Diamond- and Ag/Diamond MMCs." Materials Science Forum 825-826 (July 2015): 142–49. http://dx.doi.org/10.4028/www.scientific.net/msf.825-826.142.

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MMCs consisting of diamonds and highly conductive metal matrices have been produced via gas pressure assisted liquid metal infiltration and their thermal properties have been investigated. Special attention was paid towards the diamond surface termination and its influence on the diamond-metal-interface and the resulting heat transport across this interface. Altering the diamond terminating surface layer can lead to a rather drastic increase in the thermal conductivity, rendering MMCs with pretreated diamonds double the thermal conductivity of the ones with as-received diamonds. The evolution

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12

Valerii, Lavrinenko, Solod Volodymyr, Ilnytska Halina, Smokvyna Volodymyr, and Kashynskiy Ivan. "RESEARCH OF THERMAL INFLUENCE ON THE CHANGE OF THE SURFACE LAYER OF DIAMONDS AND ASSOCIATED TOOL MATERIALS (REVIEW)." Collection of scholarly papers of Dniprovsk State Technical University (Technical Sciences) 2, no. 43 (2023): 39–55. http://dx.doi.org/10.31319/2519-2884.43.2023.4.

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Attention is drawn to the fact that the issues of effective processing of such fragile, difficult-to-process materials as mono- and polycrystalline diamonds are currently being discussed in the literature, including CVD diamond films, sapphire, etc. For the most part, such processing is faced with the issues of thermal impact on the surface of the tool material, taking into account the defects of the diamonds that undergo processing, directed impact on the surface of such diamonds, heat and modification of the surface of diamonds and accompanying tool materials. In this review, attention

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13

Levin, М., and I. Sheveleva. "Institutional Aspects of the International Diamond Market’s Organization and Functioning." Voprosy Ekonomiki, no. 10 (October 20, 2009): 62–79. http://dx.doi.org/10.32609/0042-8736-2009-10-62-79.

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The article analyzes the institutional and structural heterogeneity of international diamond market. Two market levels are considered: diamond primary supply (by mining companies) and the level of rough diamonds resales and polished diamonds manufacturing. It is shown that on the primary diamond market level the oligopoly structure has been established, and the secondary rough diamond market level is competitive. On the primary market level contractual commitments are enforced by "block booking sales"; on the level of rough diamonds resales and polished diamonds manufacturing — by social and e

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14

KVASNYTSYA, V. M. "The Size and Shape of Diamond Crystals of Different Origin." Mineralogical Journal 44, no. 1 (2022): 32–40. http://dx.doi.org/10.15407/mineraljournal.44.01.032.

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The size and shape of diamond crystals of different origin are analyzed. Diamonds with a size of less than about 0.5 mm are classified as microcrystals. Diamonds found in meteorites typically show non-faceted anhedral crystals of various sizes. Only the Canyon Diablo iron meteorite has cubic microcrystals of unclear crystallogenesis. Nano, micro- and macro-sized crystals of diamond in meteorites are usually aggregate in nature. The release of diamond polyhedra in meteorites is limited by the too small size of its crystals in chondrites and by its solid-phase transformation from very fine-grain

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15

Zhang, Qunli, Yiyun Chen, Bo Li, Changyi Wang, Lijuan Wu, and Jianhua Yao. "Tribological Behavior of Ti-Coated Diamond/Copper Composite Coating Fabricated via Supersonic Laser Deposition." Lubricants 11, no. 5 (2023): 216. http://dx.doi.org/10.3390/lubricants11050216.

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Diamond/copper composite coating is promising for wear-resistant applications, owing to the extreme hardness of the diamond reinforcement. Ti-coated diamond/copper composite coatings with various laser powers were successfully fabricated employing the novel manufacturing technology of supersonic laser deposition (SLD). Ti-coated diamond, which was able to enhance the wettability between diamond and copper, was prepared at the optimal parameters via salt bath. Nano-spherical titanium carbides were uniformly distributed on the diamond’s surface to generate a favorable interface bonding with a co

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16

Liu, Fukang, Ying Guo, Shaojie Lv, and Guange Chen. "Application of the Entropy Method and Color Difference Formula to the Evaluation of Round Brilliant Cut Diamond Scintillation." Mathematics 8, no. 9 (2020): 1489. http://dx.doi.org/10.3390/math8091489.

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A modeling approach combining the entropy method and color difference formula is proposed in order to quantitatively evaluate diamond scintillation. The images of 66 diamonds were captured from 0° to 105° rotation at 15° intervals. The color difference of corresponding pixels in adjacent rotation angle images was calculated using a MatLab r2014a program, which indicated the diamond’s color change due to its scintillation. A threshold (10) was determined to divide the color difference into seven color difference intervals, the percentage of which indicated the color-change area. The color diffe

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17

Gurney, J. J., and R. O. Moore. "GEOCHEMICAL CORRELATIONS BETWEEN KIMBERLITIC INDICATOR MINERALS AND DIAMONDS ON THE KALAHARI CRATON." Russian Geology and Geophysics 35, no. 2 (1994): 9–18. https://doi.org/10.2113/rgg.1994.35.2.9.

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Geochemical correlations between kimberlitic indicator minerals and diamonds have been established on the basis that diamonds in kimberlite are derived from disaggregated xenoliths of peridotite and eclogite. Garnet and chromite macrocrysts liberated from diamond harzburgite are in general more abundant than diamond itself and can be used as pathfinders to predict the presence of diamond. These garnets and chromites can be recognized by their compositions which are similar to some inclusions in diamonds. Chrome poor garnet macrocrysts liberated from potentially diamond-bearing (Group I) eclogi

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18

Li, Hongdong, Shaoheng Cheng, Jia Li, and Jie Song. "A Review on the Low-Dimensional and Hybridized Nanostructured Diamond Films." Journal of Nanomaterials 2015 (2015): 1–15. http://dx.doi.org/10.1155/2015/692562.

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In the last decade, besides the breakthrough of high-rate growth of chemical vapor deposited single-crystal diamonds, numerous nanostructured diamond films have been rapidly developed in the research fields of the diamond-based sciences and industrial applications. The low-dimensional diamonds of two-dimensional atomic-thick nanofilms and nanostructural diamond on the surface of bulk diamond films have been theoretically and experimentally investigated. In addition, the diamond-related hybrid nanostructures of n-type oxide/p-type diamond and n-type nitride/p-type diamond, having high performan

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Xia, Yue, Yunxiang Lu, Guoyong Yang, et al. "Application of Nano-Crystalline Diamond in Tribology." Materials 16, no. 7 (2023): 2710. http://dx.doi.org/10.3390/ma16072710.

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Nano-crystalline diamond has been extensively researched and applied in the fields of tribology, optics, quantum information and biomedicine. In virtue of its hardness, the highest in natural materials, diamond outperforms the other materials in terms of wear resistance. Compared to traditional single-crystalline and poly-crystalline diamonds, nano-crystalline diamond consists of disordered grains and thus possesses good toughness and self-sharpening. These merits render nano-crystalline diamonds to have great potential in tribology. Moreover, the re-nucleation of nano-crystalline diamond duri

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Shi, Zitao, Qilong Yuan, Yuezhong Wang, et al. "Optical Properties of Bulk Single-Crystal Diamonds at 80–1200 K by Vibrational Spectroscopic Methods." Materials 14, no. 23 (2021): 7435. http://dx.doi.org/10.3390/ma14237435.

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Bulk diamonds show great potential for optical applications such as for use in infrared (IR) windows and temperature sensors. The development of optical-grade bulk diamond synthesis techniques has facilitated its extreme applications. Here, two kinds of bulk single-crystal diamonds, a high-pressure and high-temperature (HPHT) diamond and a chemical vapor deposition (CVD) diamond, were evaluated by Raman spectroscopy and Fourier Transform Infra-Red (FTIR) spectroscopy at a range of temperatures from 80 to 1200 K. The results showed that there was no obvious difference between the HPHT diamond a

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Neubauer, Erich, G. Kladler, C. Eisenmenger-Sittner, et al. "Interface Design in Copper-Diamond Composite by Using PVD and CVD Coated Diamonds." Advanced Materials Research 59 (December 2008): 214–19. http://dx.doi.org/10.4028/www.scientific.net/amr.59.214.

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One of the key problems in copper-diamond composites is the interface between the metal matrix and the diamond reinforcement. In order to take advantage of the high thermal conductive diamond filler in a composite the design of the interface is crucial. One approach to minimize the thermal contact resistance between metal and diamond reinforcement is to coat the diamonds with functional layers, e.g. Mo or W. For coating of diamonds PVD and CVD have been used followed by characterization of coating thickness by different methods. The coated diamonds were used for composite manufacturing and the

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Litvin, Yu A. "Physicogeochemical Mechanisms of the Genesis of Matryoshka-Type Diamonds on the Basis of the Mantle-Carbonatite Theory." Геохимия 68, no. 3 (2023): 255–70. http://dx.doi.org/10.31857/s001675252303007x.

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A physicochemical analysis of the genesis of a unique Matryoshka-type diamond from the Nyurbinskaya kimberlite pipe of the Nakyn kimberlite field, Yakutia, Russia, was performed. The specimen consists of a host diamond with a cavity containing a loose diamond inclusion; two through holes with a width of 0.1–0.4 mm emerge from the cavity. The analysis is based on the mantle-carbonatite theory of the genesis of diamonds and associated phases developed on the basis of consistent results of a physicochemical experiment and an analytical study of paragenetic inclusions in natural diamonds from kimb

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Zhang, T., Fang Hong Sun, Bin Shen, and Z. M. Zhang. "Fabrication and Characterization of High Quality Micro Diamonds by Hot Filament CVD." Advanced Materials Research 325 (August 2011): 582–87. http://dx.doi.org/10.4028/www.scientific.net/amr.325.582.

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The high quality micro diamonds with the euhedral diamond faces are fabricated by hot filament chemical vapor deposition technique (HFCVD). The high pressure and high temperature (HPHT) single crystal diamonds in size of 1 μm are used as seeds. In order to disperse the diamond seeds uniformly on a silicon wafer, the photoresist solution with diamond seeds are performed on the silicon wafer by a spin coater machine. The high substrate temperature and low acetone concentration are employed for decreasing the nucleation rate and accelerating the growth rate. The morphology and quality of the micr

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Khachatryan, Galina, and Nataliya Anashkina. "Ratio of structural impurity distribution in diamond crystals and kimberlite pipe diamond potentiak (case study of Arkhangelsk region and Yakutia)." Ores and metals, no. 3 (November 3, 2021): 114–30. http://dx.doi.org/10.47765/0869-5997-2021-10023.

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IR spectroscopy was used to compare diamonds from 12 pipes, Arkhangelsk region. Based on positive correlation between average N and H values in diamonds from various deposits, it was found that crystals from low-grade diamond pipes are relatively enriched in hydrogen compared with diamonds from Lomonosov and Grib deposits. In terms of structural impurity distribution, Arkhangelsk deposit diamonds differ from Yakutian diamonds; it could be due to various composition of compared diamonds’ source matter and thermodynamic conditions of their growth. It is shown that hydrogen is a negative factor o

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Jotanovic, Vera, and Rita Laura D’Ecclesia. "Do Diamond Stocks Shine Brighter than Diamonds?" Journal of Risk and Financial Management 12, no. 2 (2019): 79. http://dx.doi.org/10.3390/jrfm12020079.

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This paper addresses two practical investment questions: Is investing in the diamond equity market a more feasible and liquid alternative to investing in diamonds? Additionally, is diamond equity affected by polished diamond prices? We assemble an original database of diamond mining stock prices traded on main stock exchanges in order to assess their relationship with diamond prices. Our results show that the market of diamond-mining stocks does not represent a valid investment alternative to the diamond commodity. Diamond equity returns are not driven by diamond price dynamics but rather by l

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Gao, Chao, Jun Tang Yuan, Hao Jin, and Zhong Quan Song. "Wear Characteristics of Impregnated Diamond Bit in Drilling Armor Ceramic." Advanced Materials Research 179-180 (January 2011): 1150–55. http://dx.doi.org/10.4028/www.scientific.net/amr.179-180.1150.

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This paper describes the wear characteristics of impregnated diamond bits when drilling in Al2O3 armor ceramic. With different bits being developed, drilling experiments and scanning electron microscope (SEM) examinations were conducted, and the results show that diamond wear types consist of complete crystal shape, micro fragmentation, whole fragmentation, wearing flat and falling off of diamond; abrasive wear, impact abrasion and erosion exist in the wear of diamond and bond; diamond grain size and concentration have their optimal value under fixed machining conditions; diamonds of high qual

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Varlamova, Liubov A., Sergey V. Erohin, and Pavel B. Sorokin. "The Role of Structural Defects in the Growth of Two-Dimensional Diamond from Graphene." Nanomaterials 12, no. 22 (2022): 3983. http://dx.doi.org/10.3390/nano12223983.

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The presented work is devoted to the study of the formation of the thinnest diamond film (diamane). We investigate the initial stages of diamond nucleation in imperfect bilayer graphene exposed by the deposition of H atoms (chemically induced phase transition). We show that defects serve as nucleation centers, their hydrogenation is energy favorable and depends on the defect type. Hydrogenation of vacancies facilitates the binding of graphene layers, but the impact wanes already at the second coordination sphere. Defects influence of 5|7 is lower but promotes diamondization. The grain boundary

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Yacoot, A., and M. Moore. "X-ray topography of natural tetrahedral diamonds." Mineralogical Magazine 57, no. 387 (1993): 223–30. http://dx.doi.org/10.1180/minmag.1993.057.387.04.

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AbstractThe symmetry of diamond is still sometimes questioned. Most people agree that diamond belongs to the space group Fdm and therefore to point group . Some however, on account of the existence of a few natural tetrahedral diamonds, have assigned diamond to the point group 3m. We report here on an X-ray topographic investigation, using both conventional and synchrotron sources, of eleven natural tetrahedral diamonds. Two large specimens (from the Alpheus Williams' collection) were studied and found to consist of two portions, unequal in size, that were twinned on a (111) plane. Another dia

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Zhan, You Ji, Yuan Li, Hui Huang, and Xi Peng Xu. "Wear of Brazed Diamond Wheel in Grinding of Cemented Carbide." Key Engineering Materials 416 (September 2009): 198–204. http://dx.doi.org/10.4028/www.scientific.net/kem.416.198.

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Grinding forces, protrusion height, grinding temperatures and wear of diamond grits have been studied in grinding cemented carbide YG8 with a single-layer vacuum brazed diamond wheel. The experiment results indicate that the primary wear progression of diamond grits in the whole grinding process follows the mode of whole diamonds, flat diamonds when grinding of the cemented carbide. The worn mechanism of the failure of diamond grits was discussed and possible solutions are recommended. The proportions of diamond conditions and the mean protrusion height of grains are more closely related to gr

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Tillmann, Wolfgang, and Artur Martin Osmanda. "Production of Diamond Tools by Brazing." Materials Science Forum 502 (December 2005): 425–30. http://dx.doi.org/10.4028/www.scientific.net/msf.502.425.

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Diamond tools are increasingly gaining importance as cutting materials for various construction materials. The quality of synthetic diamonds, monocrystalline as well as polycrystalline or CVD-diamonds has been significantly improved over the last years. Integrating these cutting materials requires adequate joining technologies that produce sound joints without exposing the temperature sensitive diamond to too elevated temperatures. The paper highlights current developments in the joining of synthetic diamonds to steel. Owing to their covalent atomic bonding diamonds cannot easily be wetted and

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OuYang, Zhe. "Research on the Diamond Price Prediction based on Linear Regression, Decision Tree and Random Forest." Highlights in Business, Economics and Management 24 (January 22, 2024): 248–57. http://dx.doi.org/10.54097/13ccwv59.

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Diamonds are the symbol of the pure and indestructible love and the luxury that people have always sought after. However, because people know less about diamonds, they often only rely on the introduction of salespeople and jewelers in diamond trading. Therefore, it is difficult for consumers to buy diamonds of equal value and price. To solve this problem, this paper uses Multiple Linear Regression model, Decision Tree Regression model and Random Forest Regression model to predict diamond prices based on various diamond evaluation metrics in data set, so that consumers can intuitively learn abo

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Zhang, Xuliang, Youhong Sun, Qingnan Meng, Jinhao Wu, and Linkai He. "Enhancement of Oxidation Resistance via Chromium Boron Carbide on Diamond Particles." Coatings 11, no. 2 (2021): 162. http://dx.doi.org/10.3390/coatings11020162.

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To improve the oxidation resistance of diamond, chromium boron carbide (Cr–B–C) coatings were synthesized through high temperature solid state synthesis and molten salt method on diamond particles in this paper. After holding the raw material at 900 °C for 2 h, the diamond surface was completely and uniformly covered by Cr–B–C coatings. Oxidation resistance of the diamond coated Cr–B–C was determined by the thermogravimetric analysis (TGA). The results revealed that the Cr–B–C coatings held the diamonds for 100%-mass in air atmosphere until 1151 °C, which was much better than the uncoated diam

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Pokhilenko, Lyudmila, Nikolay Pokhilenko, Vladimir Malkovets, and Taisia Alifirova. "The Earliest Generation of Diamond: The First Find of a Diamond Inclusion in Kimberlitic Olivine." Minerals 13, no. 1 (2022): 36. http://dx.doi.org/10.3390/min13010036.

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Today, it is known that the majority of diamonds are crystallized mostly from a metasomatic agent close in the main characteristics to carbonatite melts acting upon mantle rocks, and therefore, diamonds are located in the interstitial space of these rocks. So far, diamond has never been found included in other kimberlitic or xenolithic minerals. We have found a diamond inclusion inside the kimberlitic olivine grain, which is the first find of its kind. The diamond crystal is to have been captured by the growing olivine at quite high temperatures (more than 1400 °C) early in the history of the

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Liao, Yunn Shiuan, and C. T. Yang. "Investigation of the Wear of the Pad Conditioner in Chemical Mechanical Polishing Process." Advanced Materials Research 76-78 (June 2009): 195–200. http://dx.doi.org/10.4028/www.scientific.net/amr.76-78.195.

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The pad surface will become grazed because of the accumulated debris in the chemical mechanical polishing (CMP) process. It results in the reduction of the wafer removal rate, and a pad conditioner or diamond disk must be frequently employed to refresh the pad surface. The wear behavior of a diamond with respect to its location, original relative protruded height and protruded shape on a diamond disk was investigated in this thesis. It was found from experimental data that the diamonds which were located outside, originally protruded more highly and with crest lines oriented upward wore faster

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Chen, Yongqian, Shanghua Zhang, Jialin Liu, et al. "Numerical Simulation of Temperature Characteristics and Graphitization Mechanism of Diamond in Laser Powder Bed Fusion." Materials 16, no. 18 (2023): 6338. http://dx.doi.org/10.3390/ma16186338.

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Thermal damage to diamonds is a major limitation in laser powder bed fusion (LPBF) processing of metal matrix diamond composites. In this paper, a numerical simulation model was established to describe the thermal effect of the Diamond-CuSn10 composite on the LPBF process. The simulation results show that the temperature of the diamond presents a double-peak structure, and the double-peak temperature curve shape can be modulated by modifying the laser scanning offset and the size of the diamond powder. And it suggests that the heat of the diamond mainly comes from the transfer of the molten po

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36

Chepurov, Anatoly, Sergey Goryainov, Sergey Gromilov, et al. "HPHT-Treated Impact Diamonds from the Popigai Crater (Siberian Craton): XRD and Raman Spectroscopy Evidence." Minerals 13, no. 2 (2023): 154. http://dx.doi.org/10.3390/min13020154.

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Phase change and graphitization of diamonds from the Popigai impact crater (Krasnoyarsk Territory, Siberian platform, Russia) exposed to high-pressure high-temperature (HPHT) conditions of 5.5 GPa and 2000–2200 °C are studied by Raman spectroscopy and X-ray diffractometry (XRD). Light-color diamonds of type 1, free from inclusions, with 0 to 10 % lonsdaleite, are more resistant to HPHT effects than dark diamonds of type 2 rich in lonsdaleite and graphite. The lonsdaleite/diamond ratios in lonsdaleite-bearing impact diamonds become smaller upon annealing, possibly because lonsdaleite transforms

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37

Craven, J. A., B. Harte, D. Fisher, and D. J. Schulze. "Diffusion in diamond. I. Carbon isotope mapping of natural diamond." Mineralogical Magazine 73, no. 2 (2009): 193–200. http://dx.doi.org/10.1180/minmag.2009.073.2.193.

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AbstractRecent advances in ion microprobe instrumentation and techniques have enabled the mapping of C isotope ratios across the whole of a polished plate of a natural diamond from Guaniamo, Venezuela. The resultant map of C isotope variation closely matches the cathodoluminescence image of the growth structure of the diamond and, therefore, indicates an extremely limited scale of diffusion of C atoms sincethetimeof diamond formation. This result is compatible with thelimite d mobility of N atoms shown by theIaAB aggregation stateof thediamond. Inclusions in thediamond aree clogitic, in common

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Wang, Xiao-Xia, Yang-Yang Wang, Xiaodong Yao, et al. "Inclusions, Nitrogen Occurrence Modes, and C-N Isotopic Compositions of Diamonds as Indicators for Exploring the Genesis Mechanism of Diamond: A Review." Minerals 15, no. 7 (2025): 728. https://doi.org/10.3390/min15070728.

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Diamond, a crucial carbon phase in the deep Earth, forms under ultrahigh-pressure (UHP, P > 4 GPa) conditions and serves as an important indicator mineral for the UHP environment. Based on their host rocks, diamonds are classified into mantle-derived diamonds, UHP metamorphic diamonds, impact diamonds, etc. While carbon constitutes the primary component of diamonds, nitrogen represents one of the most significant impurity elements. The study of the occurrence mode of nitrogen and the C-N isotope composition is essential for exploring the formation mechanism of diamond. Nitrogen primarily ex

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Ekgasit, Sanong, and Pimthong Thongnopkun. "Transflectance Spectra of Faceted Diamonds Acquired by Infrared Microscopy." Applied Spectroscopy 59, no. 9 (2005): 1160–65. http://dx.doi.org/10.1366/0003702055012555.

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A novel transflectance technique using an infrared microscope was employed for spectral acquisition of loose and mounted faceted diamonds. The observed transflectance spectrum shows the same spectral features as those of the well-accepted diffuse reflectance spectrum. Unlike the diffuse reflectance spectrum, the transflectance spectrum was not affected by the diamond arrangements. The technique can be employed for direct spectra acquisition of mounted diamonds without taking the diamonds out of the jewelry bodies. Moreover, an individual diamond on a complex jewelry setting can be selectively

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40

Zinchuk, Nikolay, and Leonid Bardukhinov. "Diamond study features in forecasting and prospecting (Siberian platform)." Ores and metals, no. 3 (November 3, 2021): 59–75. http://dx.doi.org/10.47765/0869-5997-2021-100018.

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Based on the completed research and data summary on diamonds specific features (an example from the Siberian platform), conclusions were made that indications exist at all levels of their location: from kimberlite-related provinces, subprovinces, fields, diatremes to ore shoots. Population of diamond varieties in kimberlite rocks forms parasteric, rather than paragenetic, associations related to their coexistence in kimberlites. Morphological criteria of kimberlite diamond potential were defined depending on rounded diamonds content in them. Significant differences in kimberlites diamond poten

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Zinchuk, Nikolay, and Leonid Bardukhinov. "Diamond study features in forecasting and prospecting (Siberian platform)." Ores and metals, no. 3 (November 3, 2021): 59–75. http://dx.doi.org/10.47765/0869-5997-2021-10018.

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Based on the completed research and data summary on diamonds specific features (an example from the Siberian platform), conclusions were made that indications exist at all levels of their location: from kimberlite-related provinces, subprovinces, fields, diatremes to ore shoots. Population of diamond varieties in kimberlite rocks forms parasteric, rather than paragenetic, associations related to their coexistence in kimberlites. Morphological criteria of kimberlite diamond potential were defined depending on rounded diamonds content in them. Significant differences in kimberlites diamond poten

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Zinchenko, V. N., A. S. Ivanov, and I. V. Ashchepkov. "Diamond-associated minerals of the Zarnitsa pipe: A method for predicting CLIPPIR diamonds in weakly diamondiferous kimberlites." Regional Geology and Metallogeny, no. 99 (September 21, 2024): 44–67. https://doi.org/10.52349/0869-7892_2024_99_44-67.

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The article considers the geochemistry of diamond-associated minerals of the Karowe (Botswana) and Zarnitsa (Russia) weakly diamondiferous pipes – deposits containing high-quality and costly giant CLIPPIR diamonds. There is applied a predictive method for geochemical analogy to the diamond-associated minerals compositions of such pipes, according to a probabilistic geostatistics-based approach (cluster analysis). The methods of 5Е diagrams for four diamond-associated minerals – pyropes, picroilmenites, chromites and chrome diopsides, and 4E diagrams for pyropes can predict large and giant “nat

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Hua, Li. "Nano-Crystalline Diamond Development and Application." Advanced Materials Research 476-478 (February 2012): 1500–1503. http://dx.doi.org/10.4028/www.scientific.net/amr.476-478.1500.

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diamonds have superior performance unmatched by other materials. The nano-crystalline diamond (nano-crystalline diamond powder and nano-crystalline diamond films) is a new construction material and functional material with diamond excellent properties and nano material characteristics. Such dual bizarre characteristics determine its wide application. The application developed predicts its sound prospects, which, however, requires researchers to conduct studies and development.

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Bulgakova, Vladislava, Pavel Chizhov, Alexander Ushakov, et al. "Optical Pump–Terahertz Probe Diagnostics of the Carrier Dynamics in Diamonds." Materials 17, no. 1 (2023): 119. http://dx.doi.org/10.3390/ma17010119.

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Diamond is a promising material for terahertz applications. In this work, we use a non-invasive optical pump–terahertz probe method to experimentally study the photoinduced carrier dynamics in doped diamond monocrystals and a new diamond-silicon composite. The chemical vapor deposited diamond substrate with embedded silicon microparticles showed two photoinduced carrier lifetimes (short lifetime on the order of 4 ps and long lifetime on the order of 200 ps). The short lifetime is several times less than in boron-doped diamonds and nitrogen-doped diamonds which were grown using a high temperatu

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Xiang, Dong, Li Qun Jia, and Ke Gao Liu. "Structure and Performance of Chemical Duplex Plating Ti Metal Layer on Diamond Surface by Hydrothermal Method." Advanced Materials Research 936 (June 2014): 1676–80. http://dx.doi.org/10.4028/www.scientific.net/amr.936.1676.

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As a surface of diamond has a higher interfacial energy and worse binding force, the diamond shed from matrix easily. For solving this, the microstructures and properties of the metallic coating on diamond surface were studied. The different temperatures, such as 110, 120, and 130 °C for 6 h, were used for coating diamond in the high-pressure reactor respectively. The structure and performance of the metallic coating on diamond surface were tested by Scanning Electron Microscopy (SEM), X-ray Diffraction (XRD) and diamond compressive strength instrument. The results showed that a continuous and

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Alqahtani, Abdulaziz S., Abdulaziz A. AlHelal, Abdullah S. Alayad, et al. "Assessment of Diamond Rotary Instruments Advertised for Cutting 3Y-TZP Restorations. A Scanning Electron Microscope Analysis." Journal of Biomaterials and Tissue Engineering 13, no. 3 (2023): 493–97. http://dx.doi.org/10.1166/jbt.2023.3274.

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Aim: To examine the cutting efficiency and amount of material removed from crown-cutting diamond burs from a different manufacturer on zirconia using an electric handpiece. Material and Methods: The performance of super coarse diamond bur round-end from five different manufacturers that were commercially advertised as zirconium crown cutters were assessed. The five manufacturers and their respective diamond bur models tested were super coarse Group 1: Dimond bur, Group 2: Zirconia Diamond Bur, Round End Cylinder, Meisinger, Group 3: 4ZR Zirconia Cutter Diamond Crown Removal Bur, Group 4: Brass

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Salikhov, Ravil, Konstantin Garanin, Alexander Tolstov, et al. "Geology and mineral composition of Zarya kimberlite pipe, western Yakutia." Domestic geology, no. 6 (January 22, 2021): 48–67. http://dx.doi.org/10.47765/0869-7175-2020-10030.

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The geological and tectonic settings of new primary low-grade diamond deposit, the Zarya pipe (Alakit-Markhinsky kimberlite field, Yakutian diamond province, Western Yakutia, Russia), are discussed. Data on the geological structure of the diatreme, mineral composition and kimberlite diamond content is presented. The factors determining the vertical and lateral heterogeneity of the mineral-indicative characteristics of kimberlites, diamond assemblage minerals, and diamonds are considered. It is concluded that diamond quality and grades increase with depth.

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CHEN, CHANGLE, and QIANWANG CHEN. "RECENT DEVELOPMENT IN DIAMOND SYNTHESIS." International Journal of Modern Physics B 22, no. 04 (2008): 309–26. http://dx.doi.org/10.1142/s0217979208038685.

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The high pressure-high temperature (HPHT) method led to wide applications of artificial diamonds in industry. Low temperature coating of diamonds has been studied for some time, and chemical vapor deposition has been developed. In this contribution, we will focus on the most recent developments in diamond synthesis, and especially the important progress upon hydrothermal synthesis and the reduction of carbide (HSRC), which has attracted more and more attention due to its great commercial potential. Especially, we will discuss the synthesis of colorless, large diamond crystals from the reductio

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Yang, Jun De, Wen Li Lin, and Yuan Wang. "Research on the Design of Diamond Size in Diamond Drill Bits and Diamond Saw Blades." Applied Mechanics and Materials 148-149 (December 2011): 1548–53. http://dx.doi.org/10.4028/www.scientific.net/amm.148-149.1548.

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In this paper, it is assumed that diamond’s cross-section is hexagonal, which is similar to the actual condition. At first the diamond cutting depth of diamond drill bits and diamond saw blades has been calculated and analyzed. A variety of diamond size and diamond exposure difference has also been calculated and analyzed. It is shown that the cutting depth of single diamond was generally below 0.02mm and the difference on diamond exposure between coarse and fine diamond must be less than diamond cutting depth to achieve efficient rock breaking. Some diamond size design methods are acquired vi

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Edtmaier, Christian, Ernst Bauer, Zeze Serge Tako, and Jakob Segl. "Thermal Conductivity Behaviour of Al/Diamond and Ag/Diamond Composites in the Temperature Range 4 K < T < 293 K." Materials Science Forum 825-826 (July 2015): 197–204. http://dx.doi.org/10.4028/www.scientific.net/msf.825-826.197.

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Two different systems, the non-reactive Ag–diamond and the reactive Al–diamond system, were assessed by their thermal conductivity behaviour, both were fabricated by gas pressure assisted infiltration of densely packed diamond bulks with aluminium or silver and different Si-concentration and diamonds of varying particle sizes. The effect of Si-concentration on the interface thermal conductance h between Al, Ag and diamonds was investigated in dependence of temperature by measuring thermal conductivity of composites with different sized diamond particles in the temperature range from 4 K up to

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