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Journal articles on the topic 'Aluminum crystals'

Author: Grafiati

Published: 4 June 2021

Last updated: 31 January 2023

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1

Chen, Ting Yi, Wen Lu, Wei Liu, Ya Dian Xie, and Ye Qi Fu. "Preparation of Purity Al₂O₃for LED Sapphire Materials by Ammonium Aluminum Sulfate and its Performance." Advanced Materials Research 1053 (October 2014): 50–55. http://dx.doi.org/10.4028/www.scientific.net/amr.1053.50.

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The preparation of aluminium sulfate adopting the sulfuric acid heating method with Al (OH)3 as raw material, and join the β complexing agent in aluminium sulfate solution to remove impurities; ammonium aluminum sulfat is prepared by the reaction of the ammonium solution and aluminum sulfate, and purify ammonium aluminum sulfate to get high purity ammonium aluminum sulfate crystals containing crystal water. Purify the crystallization of ammonium aluminum sulfate with containing water treated at 1250 °C for 3 h. Then the high purity alumina was prepared. Break the high purity alumina to press,

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2

Shiran, N. "Defects related luminescence in yttrium-aluminum garnet crystals." Functional materials 23, no. 2 (2016): 191–96. http://dx.doi.org/10.15407/fm23.02.191.

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3

Kuroda, K., H. Matsuhata, and H. Saka. "CBED Analysis of YBa2Cu3-xAlxOy single Crystals." Proceedings, annual meeting, Electron Microscopy Society of America 48, no. 2 (1990): 512–13. http://dx.doi.org/10.1017/s0424820100136167.

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Single crystals of YBa2Cu30y were grown from melting mixture of yttria, barium carbonate and copper oxide contained in alumina crucibles. Crystals grew as platelets with the (001) broad surface. The use of alumina crucibles for crystal growth resulted in incorporation of aluminum to varying extents in crystals of composition YBa2Cu3-xAlx0y, x=0-0.23. Microstructural and microchemical characterization of single crystals were carried out by transmission electron microscopy along with electron dispersive x-ray analysis. Convergent beam electron diffraction (CBED) technique was used to determine c

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4

Feng, Yan, Rongxin Guo та Zhiwei Lin. "Effect of Aluminum Sulfate and Succinic Acid on the Growth Law of α-Calcium Sulfate Hemihydrate under Microwave Irradiation". Advances in Materials Science and Engineering 2021 (12 квітня 2021): 1–13. http://dx.doi.org/10.1155/2021/6630638.

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The existing α-hemihydrate gypsum preparation process has low production efficiency and high energy consumption. In this paper, α-type hemihydrate gypsum was prepared by microwave irradiation using phosphogypsum as the raw material, calcium chloride solution as the reaction medium, and succinic acid and aluminum sulfate as crystal-transforming agents. Both aluminum sulfate and succinic acid were studied to determine the mechanism influencing the effect on the growth of α-type hemihydrate gypsum crystals. This study found that, without added succinic acid or aluminum ions, the crystal transform

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5

Filippov, Pavel, and Ursula Koch. "Nanoindentation of Aluminum Single Crystals: Experimental Study on Influencing Factors." Materials 12, no. 22 (2019): 3688. http://dx.doi.org/10.3390/ma12223688.

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Results from nanoindentation of aluminum single crystals deliver valuable information as model systems for understanding technical aluminum alloys. The effect of the crystal orientation and the azimuthal indenter orientation on indentation hardness and modulus was studied by Vickers indentation (max. load 10 mN) on single crystal surfaces with (100), (110), and (111) orientations. The average indentation hardness varied, depending on the crystallographic orientation, by 1.8%. The anisotropy of the elastic modulus (1.1% of the average modulus) is lowered (indentation averaging effect). This is

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6

Hens, Philip, Ulrike Künecke, and Peter J. Wellmann. "Aluminum P-Type Doping of Bulk SiC Single Crystals by Tri-Methyl-Aluminum." Materials Science Forum 600-603 (September 2008): 19–22. http://dx.doi.org/10.4028/www.scientific.net/msf.600-603.19.

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We present p-type doping of bulk SiC crystals by the modified physical vapor transport (M-PVT) technique using TMA (Tri-Methyl-Aluminum). Using TMA as a dopant precursor allows a quite well defined crystal growth process control. The issue of improvement of conductivity (reduction of substrate resistivity) by reduction of unintentional acceptor compensation by nitrogen is addressed. It is shown that a decrease of compensation from approx. 3%...10% to approx. 0.5%...2.5% leads to a charge carrier mobility and, hence, conductivity increase of about factor two.

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7

Pawlak, Dorota A., Masahiko Ito, Lukasz Dobrzycki, et al. "Structure and spectroscopic properties of (AA′)(BB′)O3 mixed-perovskite crystals." Journal of Materials Research 20, no. 12 (2005): 3329–37. http://dx.doi.org/10.1557/jmr.2005.0412.

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Five different mixed-perovskite (AA′)(BB′)O3 single crystals were grown, where A = La, Nd; A′ = Sr; B = Al, Ga; and B′ = Ta, Nb. The as-grown crystals were yellowish/brownish. After annealing in air, the coloration was more intense. Annealing in a reducing atmosphere decreased coloration. The crystals were investigated by transmission spectroscopy, electron spectroscopy for chemical analysis (ESCA), and single-crystal x-ray diffraction. Additional broad absorption bands in the transmission spectra were observed for the as-grown samples. They are in line with the changes of the shape of O(1s) E

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8

Ding, Wan Wu, Wen Jun Zhao, and Tian Dong Xia. "The Formation Mechanism of Equiaxed Crystals in Pure Aluminum Solidification Structure under the Al-Ti-C Master Alloy." Advanced Materials Research 668 (March 2013): 865–69. http://dx.doi.org/10.4028/www.scientific.net/amr.668.865.

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The influence of different solidified velocities on the structure of pure aluminum during the process of refinement by Al-5Ti-0.6C master alloy was studied and the impact mechanism was discussed. The results show that at the same solidified velocity, with the increase of the amount of Al-5Ti-0.6C master alloy, in the solidified structure of pure aluminum, columnar crystals will gradually decrease, while equiaxed crystals will gradually increase. But in the case when the level of addition is the same, the faster the solidified velocity, the greater the number of equiaxed crystals will be in the

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9

Sharma, Sonali, Mithra N. Hegde, and Sindhu Ramesh. "Anticariogenic Sanative Effect of Aluminum Gallium Arsenide Crystals on Hydroxyapatite Crystals." Crystals 12, no. 12 (2022): 1841. http://dx.doi.org/10.3390/cryst12121841.

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Dental caries is a progressive disease with varying phases of demineralization and remineralization, and the scope of reversing the carious lesion is increased if it is diagnosed before there is surface cavitation. Preventive management strategies are directed towards making the enamel more resistant towards acid dissolution. The caries preventive protocol has always been fluoride-centric. Repeated application of fluoride gives rise to acquired fluoride resistance strains of Streptococci mutans which can be transient or permanent. The need of the hour is an effective remineralizing protocol wh

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10

Свербиль, П. П., В. С. Горелик, Dongxue Bi, Guang Tao Fei, Shao Hui Xu та Xu Dong Gao. "Угловые зависимости спектров пропускания фотонно-кристаллических пленок на основе оксида алюминия". Журнал технической физики 127, № 10 (2019): 548. http://dx.doi.org/10.21883/os.2019.10.48355.176-19.

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AbstractThe angular dependences of the transmission of a one-dimensional photonic crystal based on porous anodic aluminum oxide are studied in the wavelength range of 320–1200 nm. The possibility of using porous one-dimensional photonic crystals based on aluminum oxide as selective narrowband optical filters and mirrors is studied.

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11

Häßner, Manuel, Denis A. Vinnik, and Rainer Niewa. "Thermal History Dependent Al Distribution in Aluminum Substituted Strontium Hexaferrite." Materials 13, no. 4 (2020): 858. http://dx.doi.org/10.3390/ma13040858.

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Single crystals of aluminum substituted strontium hexaferrite SrFe12–xAlxO19 were grown from sodium oxide based flux. The substitution level aimed for was x = 1.2. Annealing experiments performed on single crystals show that the Al distribution on the five iron sites of the hexaferrite structure depends on the annealing time at 900 °C. Single crystal X-ray diffractometry shows that annealing a crystal after the initial synthesis has an impact on the Al content on the octahedrally and tetrahedrally coordinated sites. Furthermore, it was found that heating in a corundum crucible increases the ov

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12

Romanova, Varvara, Ruslan Balokhonov, Olga Zinovieva, Dmitry Lychagin, Evgeniya Emelianova, and Ekaterina Dymnich. "Mechanical Aspects of Nonhomogeneous Deformation of Aluminum Single Crystals under Compression along [100] and [110] Directions." Metals 12, no. 3 (2022): 397. http://dx.doi.org/10.3390/met12030397.

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The deformation behavior of aluminum single crystals subjected to compression along the [100] and [110] directions is numerically examined in terms of crystal plasticity. A constitutive model taking into account slip geometry in face-centered cubic crystals is developed using experimental data for the single-crystal samples with lateral sides coplanar to certain crystal planes. Two sets of calculations are performed using ABAQUS/Explicit to examine the features of plastic strain evolution in perfectly plastic and strain-hardened crystals. Special attention is given to the discussion of mechani

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13

Dravid, V. P., J. A. Sutliff, A. D. Weslwood, M. R. Nolts, and C. E. Lyman. "Centrosymmetric and nonsymmorphic aluminum oxynitride spinel." Proceedings, annual meeting, Electron Microscopy Society of America 47 (August 6, 1989): 512–13. http://dx.doi.org/10.1017/s0424820100154536.

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There is considerable controversy concerning the point and space group of crystals based on the spinel structure. The debated question is whether the space group of spinel crystals is or . has noncentrosymmetric point group and is symmorphic; has centrosymmetric point group and is nonsymmorphic. One characteristic of the space group that distinguishes it from is that reflections hkl such that h+k, k+l, h+l ≠ 4n, for example {200}, are kinematically forbidden.MgAl2O4 spinel was studied by Steeds and Evans whose observations of {200} reflections in {001} ZAPs lead them to conclude that the space

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14

Lu, Zheng Qian, Yi Pu Qu, Mussaab I. Niass, Muhammad Nawaz Sharif, Yu Huai Liu, and Fang Wang. "Effect of Growth Chamber Structure on the Growth of Aluminum Nitride Crystals." Materials Science Forum 954 (May 2019): 3–8. http://dx.doi.org/10.4028/www.scientific.net/msf.954.3.

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AlN crystals are one of the representative III-V group semiconductor materials. AlN has good electric field characteristics, thermal conductivity and thermal stability. Owing to its wide direct band gap of 6.2eV [1], it can achieve a luminescent wavelength of 210 nanometers in deep ultraviolet, which is an ideal material for UV and deep UV LED devices. But preparation of AlN crystals with PVT for growing conditions demanding, 0.3-0.5 atm of high purity nitrogen atmosphere of growth and the growth of 2100-2400 K temperature [2, 3]. In this paper, two kinds of growth chamber structures are desig

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15

Woo, S. H., Min Ku Lee, and Chang Kyu Rhee. "Synthesis of Aluminum Monohydroxide Nanofiber by Electrolysis of Aluminum Plates." Materials Science Forum 534-536 (January 2007): 129–32. http://dx.doi.org/10.4028/www.scientific.net/msf.534-536.129.

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Aluminum hydroxides were synthesized by a simple electrolytic reaction of aluminum plates. The aluminum monohydroxide, boehmite(AlO(OH)), was predominantly formed by the application of an electrical potential above 30V, while the mixture of the bayerite(Al(OH)3) and boehmite(AlO(OH)) phases were formed below 20V. The boehmite has a clear fibrous structure which is controlled on a nanometer scale. On the contrary, the bayerite consists of the typical hourglass or semi-hourglass shaped coarse crystals as a result of an aggregation of the various crystals stacked together. The specific surface ar

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16

Fukuda, Yukihide, Keiichiro Oh-ishi, Minoru Furukawa, Zenji Horita, and Terence G. Langdon. "Influence of crystal orientation on ECAP of aluminum single crystals." Materials Science and Engineering: A 420, no. 1-2 (2006): 79–86. http://dx.doi.org/10.1016/j.msea.2006.01.086.

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17

Mostovshchikov, Andrei V., Alexander P. Ilyin, and Irina K. Zabrodina. "Morphology of Aluminum Nanopowder Combustion Products in a Magnetic Field in Air." Key Engineering Materials 685 (February 2016): 516–20. http://dx.doi.org/10.4028/www.scientific.net/kem.685.516.

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The microstructure of aluminum nanopowder combustion crystalline products in air and the influence of a constant magnetic field (with induction of 0.3 T) on their structures have been studied. It was revealed that in the combustion products of free-poured aluminum nanopowder two-level whiskers are present. Hexagonal single crystals are formed by combustion in air in a homogeneous magnetic field, and in case of inhomogeneous magnetic field (with induction of 0.3 T) faceted elongated crystals of micron size are generated. The crystallites of such structure are formed due to the mass transfer of

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18

Hayashi, Tomohiro, Hidemoto Shiga, Masayoshi Sadakata, Tatsuya Okubo, and Masahiro Yoshimura. "Hydrothermal growth of millimeter-sized aluminosilicate sodalite single crystals in noble metal capsules." Journal of Materials Research 13, no. 4 (1998): 891–95. http://dx.doi.org/10.1557/jmr.1998.0120.

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Aluminosilicate sodalite Na8[SiAlO4]6Cl2 single crystals are synthesized by hydrothermal processing at 873–973 K and 100–150 MPa in noble metal capsules to avoid contamination. The starting material is aluminosilicate gel, and spontaneous nucleation followed by its growth takes place. The largest size of the single crystals obtained is 1 mm across. Longer aging and heating result in larger single crystals. It is also found that the aluminum source in the synthesis gel and the element used in the noble metal capsules influence the single crystal growth. Judging from x-ray diffraction (XRD) (pow

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19

Ray, Atish K., and Bradley J. Diak. "Classification of Textures and Microstructure Stability in Rolled F.C.C. Metals with Grain Interactions." Materials Science Forum 702-703 (December 2011): 253–60. http://dx.doi.org/10.4028/www.scientific.net/msf.702-703.253.

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A novel experimental investigation of both high and medium stacking fault energy bi-crystals of aluminum and copper, respectively, show that orientation, grain interaction and material are all key factors in the stability of some ideal rolling texture components. Ideal {110} or {112} orientations obtained from high purity aluminum or copper single crystals were embedded within a {110} crystal orientation of the same material and reduced 60 percent by channel die compression at room temperature. Spatial misorientations developed inside the deformation bands were analyzed using SEM-based EBSD. T

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20

Eto, Kazuma, Tomohisa Kato, Satoru Takagi, et al. "Growth Study of p-Type 4H-SiC with Using Aluminum and Nitrogen Co-Doping by 2-Zone Heating Sublimation Method." Materials Science Forum 821-823 (June 2015): 47–50. http://dx.doi.org/10.4028/www.scientific.net/msf.821-823.47.

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p-type SiC crystals doped with aluminum and nitrogen were grown by the sublimation method. We found that Al and N co-doping is effective for stabilized growth of p-type 4H-SiC polytype. We studied the relationship of polytype of grown crystals and the condition of Al and N feeding during the crystal growth. p-type 4H-SiC withp~1 x 1018cm-3are stably-obtained with this method.

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21

Honma, Tsuyoshi, Takayuki Komatsu, and Yasuhiko Benino. "Patterning of c-axis-oriented Ba2TiX2O8 (X = Si, Ge) crystal lines in glass by laser irradiation and their second-order optical nonlinearities." Journal of Materials Research 23, no. 4 (2008): 885–88. http://dx.doi.org/10.1557/jmr.2008.0135.

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Crystal lines consisting of nonlinear optical fresnoite-type Ba2TiX2O8 (X = Si, Ge) crystals are patterned on the surface of CuO (1 mol%)-doped 33.3BaO–16.7TiO2–50SiO2 or –50GeO2 glasses by continuous-wave (cw) neodymium:yttrium aluminum garnet (Nd:YAG) laser (wavelength 1064 nm) irradiation. It is confirmed from polarized micro-Raman scattering spectra that the c axis of Ba2TiX2O8 crystals in the lines are oriented along the laser-scanning direction (i.e., parallel to the lines). The azimuthal dependences of second-harmonic (SH) intensities for the crystal lines indicate unique fringe pattern

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22

Emelianova, Evgeniya, Varvara Romanova, Olga Zinovieva, Ruslan Balokhonov, Aleksandr Zinoviev, and Maksim Sergeev. "A Micromechanical Model of Additively Manufactured Aluminum Alloys." EPJ Web of Conferences 221 (2019): 01016. http://dx.doi.org/10.1051/epjconf/201922101016.

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A micromechanical model is developed to predict the deformation behavior of additively manufactured aluminum alloys. Three-dimensional models of grain structures typical for different microregions of the melt pool are generated by the step-by-step packing method. A crystal plasticity-based constitutive model accounting for the elastic-plastic anisotropy of face-centered cubic crystals is employed to simulate the microscale deformation in an additively manufactured aluminum alloy under loading. The grain shape and texture effects on the plastic strain localization patterns are analyzed.

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23

Gu, Z., L. Du, J. H. Edgar, et al. "Sublimation growth of aluminum nitride crystals." Journal of Crystal Growth 297, no. 1 (2006): 105–10. http://dx.doi.org/10.1016/j.jcrysgro.2006.09.038.

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24

Helava, H., S. J. Davis, G. D. Huminic, et al. "Growth of bulk aluminum nitride crystals." physica status solidi (c) 4, no. 7 (2007): 2281–84. http://dx.doi.org/10.1002/pssc.200674897.

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25

Lee, Hee Jun, Hee Tae Lee, Hee Won Shin, et al. "Effect of Various Crucibles for High Quality AIN Crystal Growth on SiC Seed by PVT Method." Materials Science Forum 821-823 (June 2015): 1007–10. http://dx.doi.org/10.4028/www.scientific.net/msf.821-823.1007.

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Aluminum nitride (AlN) bulk crystals, approximately 50.8mm in diameter and up to 5mm thickness, were grown by a physical vapor transport (PVT) method in a tantalum crucible. To investigate the effect of crucible materials, various crucible materials, a graphite and TaC-coated graphite and tantalum crucible were used for the AlN growth. XRD pattern of AlN crystal grown on SiC seed in the Ta-crucible exhibited only (00l) peaks, indicating that AlN single crystal was successfully grown on SiC seed. The interface structure between AlN and SiC crystals was observed by a high resolution TEM.

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26

CLAYTON, J. D. "SHOCK COMPRESSION OF METAL CRYSTALS: A COMPARISON OF EULERIAN AND LAGRANGIAN ELASTIC-PLASTIC THEORIES." International Journal of Applied Mechanics 06, no. 05 (2014): 1450048. http://dx.doi.org/10.1142/s1758825114500483.

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An unconventional nonlinear elastic theory is advocated for solids undergoing large compression as may occur in shock loading. This theory incorporates an Eulerian strain measure, in locally unstressed material coordinates. Analytical predictions of this theory and conventional Lagrangian theory for elastic shock stress in anisotropic single crystals of aluminum, copper and magnesium are compared. Eulerian solutions demonstrate greater accuracy compared to atomic simulation (aluminum) and faster convergence with increasing order of elastic constants entering the internal energy. A thermomechan

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27

Huynh, Nam N., Cheng Lu, Liang Ying Si, and Kiet Tieu. "An Orientation-Dependent Failure Criterion for FCC Crystals." Key Engineering Materials 385-387 (July 2008): 801–4. http://dx.doi.org/10.4028/www.scientific.net/kem.385-387.801.

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The crystalline orientation significantly affects the fracture behavior of crystals. However, the orientation-dependent failure criterion is still lacking up to now. In this paper the failure criteria for different crystalline planes of aluminum have been developed. The critical normal stresses to separate two parallel crystallographic planes have been calculated based on Morse potential. The critical stresses on four different planes ({100}, {111}, {110} and {120}) were obtained. It has been found that plane {120} had the minimum critical normal stress. The developed failure criteria have bee

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28

Lu, Chang Liang, Fang You Hu, Xu Ren Huang, et al. "Microstructure and Fatigue Properties of Aero Aluminum Alloy Repaired by Laser Melt Casting." Advanced Materials Research 314-316 (August 2011): 1871–75. http://dx.doi.org/10.4028/www.scientific.net/amr.314-316.1871.

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The paper presents a study of renovation of aerial aluminum alloy (LY12CZ) by laser melt casting with Al matrix composite powder. The microstructure of the melt casting zone was investigated, and the fatigue contrast test was carried out between the repaired specimens and the undamaged specimens. It is found that the melt casting zone consists of equiaxed crystals and columnar crystals. The equiaxed crystals distribute in the deposited layer and the crystal size is about 3~4μm. The columnar crystals whose axial direction size comes to 30μm~40μm exist near the interface with its crystallographi

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Itoh, Kohei, W. L. Hansen, E. E. Haller, et al. "High purity isotopically enriched 70Ge and 74Ge single crystals: Isotope separation, growth, and properties." Journal of Materials Research 8, no. 6 (1993): 1341–47. http://dx.doi.org/10.1557/jmr.1993.1341.

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70Ge and 74Ge isotopes were successfully separated from natural Ge and zone purified. Several highly enriched, high purity 70Ge and 74Ge single crystals were grown by the vertical Bridgman method. The growth system was designed for reliable growth of low dislocation density, high purity Ge single crystals of very small weight (∼4 g). A 70Ge and a 74Ge crystal were selected for complete characterization. In spite of the large surface to volume ratio of these ingots, both 70Ge and 74Ge crystals contain low electrically active chemical net-impurity concentrations of ∼2 × 1012 cm−3, which is two o

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Nimthong, Ruthairat, Matthias Zeller, Patimaporn Sungnoi, Sumpun Wongnawa, and Chaveng Pakawatchai. "Alexdrandrite Effects and Pseudosymmetry in Aluminum Oxalates." Acta Crystallographica Section A Foundations and Advances 70, a1 (2014): C1017. http://dx.doi.org/10.1107/s2053273314089827.

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Three chromium doped potassium aluminum oxalates, (K3[Al0.95Cr0.05(C2O4)3]·3H2O) "Blue", (K2/3Na7/3[Al0.95Cr0.05(C2O4)3]·4H2O) "RedCubic", and (K18{Na[Al0.964Cr0.036(C2O4)3]6}Cl·18H2O) "Red-Hexagonal" were prepared from aqueous solutions of K3[Cr(C2O4)3]·3H2O, K3[Al(C2O4)3]·3H2O and NaCl, and their solid state and solution properties were rationalized from their crystal structures, analysis data and solid state and solution UV-vis spectra. Crystals of "RedCubic" are characterized by a metrically cubic I-centered unit cell, but do have actual tetragonal symmetry derived by ordering of sodium an

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Bilski, Paweł, Anna Mrozik, Wojciech Gieszczyk, Sergiy Nizhankovskiy, and Yuriy Zorenko. "Infrared Stimulated Luminescence of Ce3+ Doped YAG Crystals." Materials 15, no. 23 (2022): 8288. http://dx.doi.org/10.3390/ma15238288.

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In this study, the infrared optically stimulated luminescence (IRSL) of single crystals of Ce3+ doped yttrium aluminum garnet (YAG) was investigated for the first time. It was found that infrared stimulation of these crystals, following previous exposure to beta radiation, produces a strong luminescence signal. The highest luminescence efficiency was exhibited by the YAG crystal with 0.1% of Ce. With this crystal, it was possible to measure as low doses as 0.1 mGy. Moreover, IRSL is mainly related to the TL peak at a relatively high temperature of c.a. 175 °C, which leads to quite good stabili

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Lu, Ming Fang, Shu Hao Chuang, and Hsing Juin Lee. "Effects of Submerged Heater on the Vertical Bridgman Crystal Growth." Advanced Materials Research 189-193 (February 2011): 4022–27. http://dx.doi.org/10.4028/www.scientific.net/amr.189-193.4022.

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This study used numerical simulation to investigate the growth conditions of yttrium aluminum garnet (YAG) single crystals by the vertical Bridgman method, and discusses the process performed with or without the installation of a submerged heater (SH). The maximum flow velocity of the melted material surrounding the melt/crystal interface can be decreased, and the deflection of the melt/crystal interface can be changed under various furnace temperature gradients and distances. The minimum of the maximized flow rate indicates that the natural convection can be decreased and controlled. In this

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Gu, Z., J. H. Edgar, B. Raghothamachar, et al. "Sublimation growth of aluminum nitride on silicon carbide substrate with aluminum nitride–silicon carbide alloy transition layer." Journal of Materials Research 22, no. 3 (2007): 675–80. http://dx.doi.org/10.1557/jmr.2007.0077.

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The advantages of depositing AlN–SiC alloy transition layers on SiC substrates before the seeded growth of bulk AlN crystals were examined. The presence of AlN–SiC alloy layers helped to suppress the SiC decomposition by providing vapor sources of silicon and carbon. In addition, cracks in the final AlN crystals decreased from ∼5 × 106/mm2 for those grown directly on SiC substrates to less than 1 × 106/mm2 for those grown on AlN–SiC alloy layers because of the intermediate lattice constants and thermal expansion coefficient of AlN–SiC. X-ray diffraction confirmed the formation of pure single-c

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Liu, W. H., Xin Ming Zhang, Jian Guo Tang, and Yu Xuan Du. "3D FEM Simulation of Void Growth in Aluminum Single Crystals." Materials Science Forum 546-549 (May 2007): 893–98. http://dx.doi.org/10.4028/www.scientific.net/msf.546-549.893.

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Void growth in aluminum single crystals is simulated using the finite element method, to illustrate the effect of grain orientation on void growth, a rate dependent crystal plasticity constitutive theory is implemented as a user-defined plasticity subroutine. A three-dimension unit cell including a sphere void was employed using three-dimensional 12 active slip systems. The computed results for several grain orientations are compared, which have shown that crystallographic orientation has significant influence on growth behavior of void. And the void growth direction and shape significantly de

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Wajda, Wojciech, and Henryk Paul. "Near Grain Boundary Behavior of Aluminum Bicrystals Deformed in Plane Strain Conditions." Solid State Phenomena 186 (March 2012): 108–11. http://dx.doi.org/10.4028/www.scientific.net/ssp.186.108.

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The paper describes the mechanism of deformation at 77 K of pure aluminum bicrystals of different grain orientations. The following orientations were selected: {100}/{110} (cube/Goss) and - {100}/{100} (cube/shear) to represent the unstable vs. stable and the unstable vs. unstable behaviours, respectively. The bicrystalline samples were deformed in the plane strain conditions with the use of a channel-die immersed inside a reservoir with liquid nitrogen. The low temperature deformation increases the tendency to form plain strain inhomogeneities of the deformation in the grains with an unstable

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Davis, B. W., P. J. Moran, and P. M. Natishan. "Metastable pitting behavior of aluminum single crystals." Corrosion Science 42, no. 12 (2000): 2187–92. http://dx.doi.org/10.1016/s0010-938x(00)00032-9.

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Shelykh, A. I., V. N. Gurin, and S. P. Nikanorov. "Refractive index of Al3C2B48 aluminum borocarbide crystals." Technical Physics Letters 34, no. 7 (2008): 552–53. http://dx.doi.org/10.1134/s1063785008070043.

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Monteleone, Giuseppe. "Microabrasion of Skin with Aluminum Oxide Crystals." International Journal of Cosmetic Surgery and Aesthetic Dermatology 2, no. 3 (2000): 181–82. http://dx.doi.org/10.1089/153082000750062858.

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Butler, John F., and Hsun Hu. "Channel die compression of aluminum single crystals." Materials Science and Engineering: A 114 (July 1989): L29—L33. http://dx.doi.org/10.1016/0921-5093(89)90875-7.

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Chen, Wen-Hao, Zuo-Yan Qin, Xu-Yong Tian, et al. "The Physical Vapor Transport Method for Bulk AlN Crystal Growth." Molecules 24, no. 8 (2019): 1562. http://dx.doi.org/10.3390/molecules24081562.

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In this report, the development of physical vapor transport (PVT) methods for bulk aluminum nitride (AlN) crystal growth is reviewed. Three modified PVT methods with different features including selected growth at a conical zone, freestanding growth on a perforated sheet, and nucleation control with an inverse temperature gradient are discussed and compared in terms of the size and quality of the bulk AlN crystals they can produce as well as the process complexity. The PVT method with an inverse temperature gradient is able to significantly reduce the nucleation rate and realize the dominant g

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Zeng, Qiang, Lijuan Wang, and Wugui Jiang. "Molecular Dynamics Simulations of the Tensile Mechanical Responses of Selective Laser-Melted Aluminum with Different Crystalline Forms." Crystals 11, no. 11 (2021): 1388. http://dx.doi.org/10.3390/cryst11111388.

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The mechanical deformation of cellular structures in the selective laser melting (SLM) of aluminum was investigated by performing a series of molecular dynamics (MD) simulations of uniaxial tension tests. The effects of crystalline form, temperature, and grain orientation of columnar grains on the mechanical properties of SLM aluminum were examined. The MD results showed that the tensile strength of SLM aluminum with columnar grains at different temperatures was lower than that of single-crystal aluminum, but greater than that of aluminum with equiaxed grains. The tensile strength and Young’s

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Zhuo, Shi Yi, Xi Liu, Pao Gao, Wei Huang, Cheng Feng Yan, and Er Wei Shi. "Fluorescent P-Type 4H-SiC Grown by PVT Method." Materials Science Forum 858 (May 2016): 326–30. http://dx.doi.org/10.4028/www.scientific.net/msf.858.326.

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Fluorescent SiC, which contains donor and acceptor impurities with optimum concentrations, can work as a phosphor for visible light emission by donor-acceptor-pair (DAP) recombination. In this work, 3 inch N-B-Al co-doped fluorescent 4H-SiC crystals are prepared by PVT method. The p-type fluorescent 4H-SiC with low aluminum doping concentration can show intensive yellow-green fluorescence at room temperature. N-B DAP peak wavelength shifts from 578nm to 525nm and weak N-Al DAP emission occurred 403/420 nm quenches, when the temperature increases from 4K to 298K. The aluminum doping induces hig

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Franco Júnior, A., and D. J. Shanafield. "Thermal conductivity of polycrystalline aluminum nitride (AlN) ceramics." Cerâmica 50, no. 315 (2004): 247–53. http://dx.doi.org/10.1590/s0366-69132004000300012.

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In general, polycrystalline ceramics exhibit lower thermal conductivities than their associated single crystals. For instance, at 300K, the theoretical thermal conductivity of single crystal aluminum nitride (AlN) is 319 W/m-K, whereas, the values measured for polycrystalline AlN ceramics range from 17 W/m-K to 285 W/m-K. This variation is not unusual for polycrystalline ceramics. The variability is strongly dependent upon the purity of the starting materials and the details of sintering process. The process is important since it influences the microstructure and thus influences the conduction

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Chong, Saehwa, Brian J. Riley, Zayne J. Nelson, and Samuel N. Perry. "Crystal structures and comparisons of huntite aluminum borates REAl3(BO3)4 (RE = Tb, Dy and Ho)." Acta Crystallographica Section E Crystallographic Communications 76, no. 3 (2020): 339–43. http://dx.doi.org/10.1107/s2056989020001802.

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Three huntite-type aluminoborates of stoichiometry REAl3(BO3)4 (RE = Tb, Dy and Ho), namely, terbium/dysprosium/holmium trialuminium tetrakis(borate), were synthesized by slow cooling within a K2Mo3O10 flux with spontaneous crystallization. The crystal structures were determined using single-crystal X-ray diffraction (SC-XRD) data. The synthesized borates are isostructural to the huntite [CaMg3(CO3)4] structure and crystallized within the trigonal R32 space group. The structural parameters were compared to literature data of other huntite REAl3(BO3)4 crystals within the R32 space group. All th

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Лебедев, А. А., И. П. Никитина, Н. В. Середова та ін. "Исследование влияния структурных дефектов на спектры фотолюминесценции в n-3C-SiC". Письма в журнал технической физики 45, № 11 (2019): 28. http://dx.doi.org/10.21883/pjtf.2019.11.47820.17755.

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AbstractPhotoluminescence (PL) spectra have been studied in 3 C -SiC/4 H -SiC heterostructures and 3 C ‑SiC single crystals. It was shown that epitaxial 3 C -SiC layers grown on 4 H -SiC substrates have a markedly poorer crystal perfection than do 3 C -SiC single crystals. It was found that doping with aluminum gives rise to a characteristic PL both in epitaxial layers and in 3 C -SiC single crystals. At the same time, the electron irradiation of epitaxial layers does not give rise to defect-related PL, in contrast to what is observed for single crystals. An assumption is made that the twin bo

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YAMAGUCHI, Tomiko, Mitsuaki KATOH, Kazumasa NISHIO, and Naohisa SAWAI. "Growth Feature of Crystals in Aluminum and Aluminum Alloy Welded with Laser." QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY 18, no. 3 (2000): 459–67. http://dx.doi.org/10.2207/qjjws.18.459.

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Gu, Z., J. H. Edgar, Balaji Raghothamachar, Michael Dudley, Dejin Zhuang, and Zlatko Sitar. "The Effect of Aluminum Nitride-Silicon Carbide Alloy Buffer Layers on the Sublimation Growth of Aluminum Nitride on SiC (0001) Substrates." Materials Science Forum 527-529 (October 2006): 1497–500. http://dx.doi.org/10.4028/www.scientific.net/msf.527-529.1497.

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The benefits of depositing AlN-SiC alloy transition layers on SiC substrates before the seeded growth of bulk AlN crystals were determined. The presence of the AlN-SiC alloy layer helped to suppress the SiC decomposition by providing vapor sources of silicon and carbon. It enabled a higher growth temperature, and hence a higher growth rate. In addition, cracks in the final AlN crystals can be decreased because of the intermediate lattice constants and thermal expansion coefficient of AlN-SiC alloy. AlN-SiC alloys were first grown on off-axis SiC substrates by the sublimation-recondensation met

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Pan, Yun Feng, Wan Ming Huang, Ya Qing Jiang, and Qiang Song. "Effect of Aluminum Insertion Material on the Properties of AAC." Key Engineering Materials 703 (August 2016): 406–10. http://dx.doi.org/10.4028/www.scientific.net/kem.703.406.

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Study on the compressive strength, shrinkage and effect of aluminum insertion materials on the hydration products of Autoclaved Aerated Concrete (AAC). The types and properties of hydration products are studied by X-Ray Diffraction Analysis (XRD), Differential Thermal Analysis (DTA), Scanning Electron Microscope analysis (SEM) and so on. The results showed that the strength and the shrinkage resistance capability of the product could be improved effectively. Al3+successfully doped into C-S-H gel and tobermorite crystals, then replaced si4+of tobermorite and formed the system of C-A-S-H. Toberm

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Alankar, Alankar, and David P. Field. "Modeling of Deformation Microstructure - Strain Hardening and Crystallographic Reorientation of Crystallites in a Columnar Polycrystal." Materials Science Forum 702-703 (December 2011): 196–99. http://dx.doi.org/10.4028/www.scientific.net/msf.702-703.196.

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In this work microstructure evolution in a columnar polycrystal of pure aluminum is studied using a microstructure sensitive crystal plasticity finite element model (CPFEM). In the model, based upon the kinematics of crystal deformation and dislocation interaction laws, dislocation generation and annihilation are modeled. Dislocation densities evolve in the form of closed loops and are tracked as state variables, leading to spatially inhomogeneous dislocation densities that show patterning in the dislocation structures. The hardening law is based on the strength of junctions between dislocatio

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Pagis, Céline, Ana Rita Morgado Prates, Nicolas Bats, Alain Tuel, and David Farrusseng. "High-silica hollow Y zeolite by selective desilication of dealuminated NaY crystals in the presence of protective Al species." CrystEngComm 20, no. 11 (2018): 1564–72. http://dx.doi.org/10.1039/c8ce00121a.

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