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Artículos de revistas sobre el tema "CALCIUM BISMUTH"

Autor: Grafiati

Publicado: 16 de septiembre de 2023

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1

Ryabov, A. V. "New Medium-Carbon Free-Machining Steels Containing Bismuth and Calcium." Materials Science Forum 843 (February 2016): 101–5. http://dx.doi.org/10.4028/www.scientific.net/msf.843.101.

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The paper describes the properties of two new medium-carbon free-machining alloy structural steels. These steels are environmentally friendly since lead in them is replaced with much less harmful elements bismuth and calcium. Bismuth and calcium are rather uniformly distributed in the ingot, though there are two zones of bismuth heterogeneity in the bottom and in the head part of the ingot. Mechanical properties of steels are at the same level as for steels without bismuth and calcium. Non-metallic inclusion content is typical for structural steels melted in open electric arc furnaces with bas

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2

Ryabov, A. V., Aleksandr A. Dyakonov, and M. G. Vakhitov. "A New Free-Machining Steel Containing Bismuth and Calcium." Materials Science Forum 857 (May 2016): 251–55. http://dx.doi.org/10.4028/www.scientific.net/msf.857.251.

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The paper presents a new environmentally friendly lead-free free-machining structural steel AVTs19KhGN containing bismuth and calcium. The following quality characteristics of the new steel (in as-cast and forged condition) are determined: mechanical properties; austenite grain size; amount of non-metallic inclusions; surface quality. In forged rods (square 20 mm) a tendency towards an increase of bismuth content is observed from bottom to top of the ingot. Calcium distribution along the billet is uniform. Surface quality of billets in heats following the test heats is comparable to that of an

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3

Luo, Feng Chao, Jin Liang He, Jun Hu, and Yuan Hua Lin. "Influence of Slight Bismuth Additive on the Properties of Calcium Copper Titanate Ceramic." Advanced Materials Research 105-106 (April 2010): 274–77. http://dx.doi.org/10.4028/www.scientific.net/amr.105-106.274.

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The CaCu3Ti4O12 samples with slight amount of doped bismuth were prepared and tested in this research. No second phase with bismuth was found in the doped samples. It was inferred that the bismuth ions has entered the lattice and take the place of the calcium ions. The grain size was diminished with the increase of the bismuth content. The bismuth atoms can inhibit the grains from growing large, and it could be used to modify the microstructure of CaCu3Ti4O12 ceramic. The reduction of the grain size resulted in the decrease of the relative dielectric constant, according to the “internal barrie

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4

Pei, Z., A. van Dijken, A. Vink, and G. Blasse. "Luminescence of calcium bismuth vanadate (CaBiVO5)." Journal of Alloys and Compounds 204, no. 1-2 (1994): 243–46. http://dx.doi.org/10.1016/0925-8388(94)90098-1.

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5

Ryabov, A. V. "Environmental Aspects of Lead-Free Free-Machining Steels Production." Materials Science Forum 843 (February 2016): 231–35. http://dx.doi.org/10.4028/www.scientific.net/msf.843.231.

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The paper presents the results of comparative studies of working area air pollution during the production of three alloy steels containing bismuth and calcium as machinability-enhancing additives: AVTs40Kh13 (0.4 %C + 13 %Cr + Bi + Ca), AVTs14Kh17N2 (0.14 %C + 17 %Cr + 2 %Ni + Bi + Ca) and AVTs19KhGN (0.19 %C + 0.9 %Mn + 0.9 %Cr + 0.9 %Ni + Bi + Ca). Experimental studies were performed in industrial conditions at Zlatoust Electrometallurgical Plant, Ltd. According to the technology developed and used at the enterprise, bismuth was introduced in the form of shot to the steel stream during casti

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6

Ryabov, A. V. "Comparative Characteristics of Free-Machining Steels of Cr-Mo Type." Solid State Phenomena 299 (January 2020): 670–75. http://dx.doi.org/10.4028/www.scientific.net/ssp.299.670.

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The work investigates the properties of lead-free free-machining steel grade A30KhMAR, containing BN inclusions, in comparison with the base Cr-Mo steel 30KhM, lead-bearing AS30KhM, lead-calcium-bearing ASTs30KhM, calcium-bearing ATs30KhM, bismuth-calcium-bearing AVTs30KhM and tin-bearing AО30KhM. Effect of bismuth, calcium, lead, tin and boron nitride inclusions on steel susceptibility to temper brittleness and cold brittleness is studied. Contamination of steels with non-metallic inclusions is estimated. End-quench hardenability curves of the test steel A30KhMAR are obtained. Free-machining

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7

Trokiner, A., L. Le Noc, A. Yakubovskii, K. N. Mykhalyov, and S. V. Verkhovskii. "43Ca NMR Study of Bismuth-Based High-Tc Superconductors." Zeitschrift für Naturforschung A 49, no. 1-2 (1994): 373–78. http://dx.doi.org/10.1515/zna-1994-1-255.

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Abstract As a first step of a study of the electronic properties of CuO2 planes by probing calcium nuclei in the bismuth-based high-Tc materials we report here the structural assignment of Ca NMR lines measured in 43Ca-enriched samples of n = 2 ((Bi,Pb)2Sr2CaCu2O8+x) and n = 3 ((Bi,Pb)2Sr2-Ca2Cu3O10+x) bismuth compounds. Powdered samples were investigated as well as oriented pow ders, achieved by uniaxial alignment of the grains in a 7T magnetic field. For the main calcium site (Ca between two CuO2 planes), we could determine the quadrupolar as well as the shift tensors. The results indicate

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8

Szalbot, Diana, Małgorzata Adamczyk, Beata Wodecka-Duś, Jolanta Dzik, Michał Rerak, and Kamil Feliksik. "Influence of calcium doping on microstructure, dielectric and electric properties of BaBi2Nb2O9 ceramics." Processing and Application of Ceramics 12, no. 2 (2018): 171–79. http://dx.doi.org/10.2298/pac1802171s.

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Barium bismuth niobiate (BaBi2Nb2O9) ceramics modified by calcium were prepared by solid state synthesis and two-step sintering process. An impact of calcium substitution on the A site of perovskite block is presented. The investigations are focused on dielectric as well as electric aspects of the modification. The presented results reveal that the concentration of a space charge is not preserved, what is surprising due to the homovalent nature of the dopant and no reason for creating additional lattice defects and charges connected. However, not only the valence of ions, but also the calcium-

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9

Mubeen, M., and M. Anis-ur-Rehman. "Cerium Doped Bismuth Based High T_c Superconductor: Synthesis and Study of Superconducting Properties." Key Engineering Materials 510-511 (May 2012): 75–79. http://dx.doi.org/10.4028/www.scientific.net/kem.510-511.75.

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High-Tcsuperconductivity has been an emerging field for researchers since its discovery. Bismith based superconductors commonly called BSCCO have great importance among the superconducting family. It is divided into three phases among them 2223 phase is highly studied in order to investigate its superconducting properties by substitution of different elements. We have studied the substitution of cerium (Ce) on calcium site of bismuth based Bi (Pb)Sr (Ba)-2223 high-Tcsuperconductor. The nominal compositions of Bi1.6Pb0.4Sr1.6Ba0.4(Ca1-xCex)2Cu3Oxceramic superconductor were prepared by wet chemi

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10

Konkol, Izabela, Jan Cebula, Jolanta Bohdziewicz, et al. "Mineral Deposit Formation in Gas Engines During Combustion of Biogas from Landfills and Municipal WWTP." Ecological Chemistry and Engineering S 27, no. 3 (2020): 347–56. http://dx.doi.org/10.2478/eces-2020-0022.

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AbstractThe biogas produced in municipal wastewater-treatment plants (WWTP) should be cleaned before it can be used as a fuel in internal combustion engines. Efficient running of such engines is possible only subject to using high quality biogas and lubricating oil. Otherwise, biogas impurities in course of complex chemical reactions may form deposits on various engine parts as well as seriously contaminate the lubricating oil. In this paper, mineral deposits containing high concentration of bismuth, silicon, sulphur, calcium and zinc are studied. Silicon deposits demonstrating strong friction

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11

Berry, A. D., R. T. Holm, M. Fatemi, and D. K. Gaskill. "OMCVD of thin films from metal diketonates and triphenylbismuth." Journal of Materials Research 5, no. 6 (1990): 1169–75. http://dx.doi.org/10.1557/jmr.1990.1169.

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Films containing the metals copper, yttrium, calcium, strontium, barium, and bismuth were grown by organometallic chemical vapor deposition (OMCVD). Depositions were carried out at atmospheric pressure in an oxygen-rich environment using metal beta-diketonates and triphenylbismuth. The films were characterized by Auger electron spectroscopy, Nomarski and scanning electron microscopy, and x-ray diffraction. The results show that films containing yttrium consisted of Y2O3 with a small amount of carbidic carbon, those with copper and bismuth were mixtures of oxides with no detectable carbon, and

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12

Sim, M. H., J. M. Xue, and J. Wang. "Layer Structured Calcium Bismuth Titanate by Mechanical Activation." Journal of Metastable and Nanocrystalline Materials 23 (January 2005): 47–50. http://dx.doi.org/10.4028/www.scientific.net/jmnm.23.47.

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Nanocrystalline calcium bismuth titanate (CaBi4Ti4O15), which exhibits a layer structure, has been successfully synthesized by mechanical activation of constituent oxides of CaO, Bi2O3 and TiO2 in a nitrogen atmosphere at room temperature. The phase-forming calcination at elevated temperatures that is always required is skipped. CaBi4Ti4O15 derived from mechanical activation consists of nanocrystallites, which occur as aggregates of ~50 nm in sizes. It demonstrates an improved sinterability and was sintered to a density of 93.4% theoretical density at 1175oC for 2 hours. Ferroelectric properti

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13

Hamdi, Besma, Jean-Michel Savariault, Hafed El Feki, and Abdelhamid Ben Salah. "Lead bismuth calcium sodium phosphate: Pb4.6Bi0.4Ca2.6Na2.4(PO4)6." Acta Crystallographica Section C Crystal Structure Communications 60, no. 1 (2003): i1—i2. http://dx.doi.org/10.1107/s0108270103024971.

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14

Sim, M. H., J. M. Xue, and J. Wang. "Layer structured calcium bismuth titanate by mechanical activation." Materials Letters 58, no. 14 (2004): 2032–36. http://dx.doi.org/10.1016/j.matlet.2003.12.031.

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15

PEI, Z., A. VAN DIJKEN, A. VINK, and G. BLASSE. "ChemInform Abstract: Luminescence of Calcium Bismuth Vanadate (CaBiVO5)." ChemInform 25, no. 25 (2010): no. http://dx.doi.org/10.1002/chin.199425015.

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16

Simon, M., F. Mersch, C. Kuper, et al. "Refractive Indices of Photorefractive Bismuth Titanate, Barium-Calcium Titanate, Bismuth Germanium Oxide, and Lead Germanate." physica status solidi (a) 159, no. 2 (1997): 559–62. http://dx.doi.org/10.1002/1521-396x(199702)159:2<559::aid-pssa559>3.0.co;2-0.

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17

Kumar, Vinay, Nafa Singh, Ravi Kumar, and S. P. Lochab. "Synthesis and characterization of bismuth doped calcium sulfide nanocrystallites." Journal of Physics: Condensed Matter 18, no. 22 (2006): 5029–36. http://dx.doi.org/10.1088/0953-8984/18/22/003.

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18

Hancock, P., and R. Harris. "Solubility of Calcium–Magnesium–Bismuth Intermetallic in Molten Lead." Canadian Metallurgical Quarterly 30, no. 4 (1991): 275–76. http://dx.doi.org/10.1179/cmq.1991.30.4.275.

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19

Hallstedt, Bengt, Daniel Risold, and Ludwig J. Gauckler. "Thermodynamic Assessment of the Bismuth-Calcium-Oxygen Oxide System." Journal of the American Ceramic Society 80, no. 10 (2005): 2629–36. http://dx.doi.org/10.1111/j.1151-2916.1997.tb03165.x.

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20

Egorysheva, A. V., V. D. Volodin, and V. M. Skorikov. "Calcium bismuth borates in the CaO-Bi2O3-B2O3 system." Inorganic Materials 44, no. 1 (2008): 70–75. http://dx.doi.org/10.1134/s0020168508010123.

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21

Sousa, P. M., M. D. Carvalho, M. E. Melo Jorge, F. M. Costa, M. M. Cruz, and M. Godinho. "Bismuth for calcium substitution in Ca4Mn3O10: preparation and study." Solid State Sciences 5, no. 7 (2003): 943–49. http://dx.doi.org/10.1016/s1293-2558(03)00028-1.

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22

Vstavskaya, E. Yu, A. Yu Zuev, and V. A. Cherepanov. "The phase diagram of the bismuth-calcium oxide system." Materials Research Bulletin 29, no. 12 (1994): 1233–38. http://dx.doi.org/10.1016/0025-5408(94)90146-5.

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23

Mikhaylovskaya, Zoya A., Elena S. Buyanova, Sofia A. Petrova, et al. "Structure and microwave dielectric properties of Bi- and Ge-doped calcium molybdate." Chimica Techno Acta 9, no. 4 (2022): 20229411. http://dx.doi.org/10.15826/chimtech.2022.9.4.11.

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The powders of Ca1–2xBi2xMo1–xGexO4 solid solutions weresynthesized by the conventional solid state method and investigated by X–ray powder diffraction and Raman spectroscopy. The Ca1–2xBi2xMo1–xGexO4 compositions crystallize in scheelite structure (sp. gr. I41/a) at 0 x 0.4, but traces of bismuth germanates are detected by scanning electron microscopy. The x = 0.5 composition contains several phases with BiVO4- type structures. Raman spectroscopy detected the deformation of [BO4]2– polyhedra and changes in B–O bond length (B = Mo, Ge). The energy gaps were calculated from the diffuse scatteri

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24

CAPOEN, E., G. NOWOGROCKI, R. CHATER, et al. "Oxygen permeation in bismuth-based materials. Part II: Characterisation of oxygen transfer in bismuth erbium oxide and bismuth calcium oxide ceramic." Solid State Ionics 177, no. 5-6 (2006): 489–92. http://dx.doi.org/10.1016/j.ssi.2005.12.034.

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25

Shtarev, Dmitry Sergeevich, and Anna Vladimirovna Shtareva. "Photocatalytic Degradation of the Diesel Fuel by Using the Calcium Bismuthate - Bismuth Oxide Photocatalyst Composition." Applied Mechanics and Materials 377 (August 2013): 204–8. http://dx.doi.org/10.4028/www.scientific.net/amm.377.204.

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This paper provides new data on the visible light catalytic degradation of aqueous solution of diesel fuel on the calcium bismuthate - bismuth oxide catalyst compositions. It also investigated the toxicity of the catalyst composition and the products of the catalytic decomposition of diesel fuel.

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26

Sayyed, Mohammed I., Gandham Lakshminarayana, Mustafa R. Kaçal, and Ferdi Akman. "Radiation protective characteristics of some selected tungstates." Radiochimica Acta 107, no. 4 (2019): 349–57. http://dx.doi.org/10.1515/ract-2018-3062.

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Abstract The mass attenuation coefficients (μ/ρ) of calcium tungstate, ammonium tungsten oxide, bismuth tungsten oxide, lithium tungstate, cadmium tungstate, magnesium tungstate, strontium tungsten oxide and sodium dodecatungstophosphate hydrate were measured at 14 photon energies in the energy range of 81–1333 keV using 22Na, 54Mn, 57Co, 60Co, 133Ba and 137Cs radioactive sources. The measured μ/ρ values were compared with those obtained from WinXCOM program and the differences between the experimental and theoretical values were very small. The bismuth tungsten oxide has the highest μ/ρ among

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27

Liang, Yunhao, Xu Zhou, Yang Fu, et al. "Crystallization resistance behavior of Al2O3-doped calcium bismuth borate glasses." Journal of Non-Crystalline Solids 578 (February 2022): 121339. http://dx.doi.org/10.1016/j.jnoncrysol.2021.121339.

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28

Sanghi, S., S. Sindhu, A. Agarwal, and V. P. Seth. "Physical, optical and electrical properties of calcium bismuth borate glasses." Radiation Effects and Defects in Solids 159, no. 6 (2004): 369–79. http://dx.doi.org/10.1080/1042015042000272866.

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29

Srivastava, A., V. G. Gunjikar, and A. P. B. Sinha. "Thermoanalytical studies of zinc citrate, bismuth citrate and calcium citrate." Thermochimica Acta 117 (July 1987): 201–17. http://dx.doi.org/10.1016/0040-6031(87)88115-7.

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30

Kim, Hojong, Dane A. Boysen, David J. Bradwell, et al. "Thermodynamic properties of calcium–bismuth alloys determined by emf measurements." Electrochimica Acta 60 (January 2012): 154–62. http://dx.doi.org/10.1016/j.electacta.2011.11.023.

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31

Geller, S., and K. ‐Y Wu. "IncreasedTcof bismuth strontium calcium copper oxide superconductor by praseodymium substitution." Applied Physics Letters 54, no. 7 (1989): 669–70. http://dx.doi.org/10.1063/1.101467.

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32

Ji, Lang, Junsheng Liu, Chongya Liu, and Xiancheng Chen. "Oxidative dehydrogenation of ethane over lithium-bismuth-calcium oxide catalysts." Applied Catalysis A: General 114, no. 2 (1994): 207–14. http://dx.doi.org/10.1016/0926-860x(94)80174-6.

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33

Park, Jung-Sik, Chang-Eun Cho, Young-Bong Ko, Kwang-Soon Park, and Kyeung-Chae Park. "Joining Characteristics of Plasma Sprayed BSCCO Superconducting Coatings." Journal of the Korean institute of surface engineering 46, no. 5 (2013): 181–86. http://dx.doi.org/10.5695/jkise.2013.46.5.181.

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34

Żołędziewska, Magdalena, Stanisław Gronkiewicz, and Tadeusz Dobosz. "Comparison of various decalcificators in preparation of DNA from human rib bones." Anthropological Review 65 (June 30, 2002): 75–80. http://dx.doi.org/10.18778/1898-6773.65.07.

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Various calcium-binding buffers and agents in DNA preparation from fresh human rib bones were compared. We showed that the buffer described by Kuntze et al. [1996] yielded the highest quantities of DNA, but the obtained DNA was strongly degraded. The best quality DNA was obtained using two buffers: of Hänni et al. [1994] and of Ivanov et al. [1995]. Among the new calcium-binding agents that were not examined before, the most efficient were Bismuth III Oxide and Na/FeEDTA, and – in two-step decalcification – sodium citrate.

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35

Laudato, Massimiliano, Luigi Pescitelli, and Raffaele Capasso. "Natural Products of Mineral Origin." Natural Product Communications 8, no. 3 (2013): 1934578X1300800. http://dx.doi.org/10.1177/1934578x1300800336.

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Natural products of mineral origin (alum, bismuth, calcium, magnesium, silicates and zinc compounds) have maintained their popularity as drugs over the course of time. Some evidence still suggests potential benefit of these substances. Therefore, this paper reviews the characteristic features of the respective minerals and their salts along the course of studies on these products.

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36

Klimova, Alexandra V., Zoya A. Mikhailovskaya, Elena S. Buyanova, and Sofia A. Petrova. "ELECTRICAL CONDUCTIVITY OF SCHEELITE-TYPE SYSTEMS BASED ON CALCIUM AND STRONTIUM MOLYBDATES." Transactions of the Kоla Science Centre of RAS. Series: Engineering Sciences 3, no. 3/2023 (2023): 176–80. http://dx.doi.org/10.37614/2949-1215.2023.14.3.032.

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Strontium and calcium molybdates doped with bismuth and vanadium were synthesised by a conventional solid state method. The total electrical conductivity of the compositions was studied by impedance spectroscopy in the temperature range of 300–650 °С. The highest electrical conductivity is shown by solid solutions based on strontium molybdate. To estimate the contribution of electronic conductivity, measurements of the total electrical conductivity were made at various partial pressures of oxygen.

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37

Yeo, Wei Hong, Ramesh Singh, Chou Yong Tan, et al. "Effects of Bismuth Oxide on the Properties of Calcium Phosphate Bioceramics." Advanced Materials Research 264-265 (June 2011): 1839–48. http://dx.doi.org/10.4028/www.scientific.net/amr.264-265.1839.

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The aim of this work is to study the phase stability and sinterability of bismuth oxide (Bi2O3) doped HA ranging from 0.05 wt% to 1 wt%. The green samples were sintered in air at temperature ranging from 1000oC to 1400oC. In this experiment, the results from XRD analysis revealed that the stability of HA phase was disrupted when addition of 0.3, 0.5 and 1.0 wt% Bi2O3 were used and when samples sintered above 1100oC, 1000oC and 950oC, respectively. In general, HA containing 0.5 wt% of Bi2O3 and when sintered at 1000oC was found to be beneficial in enhancing densification, Young’s modulus, Vicke

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38

Uvarov, Vladimir, Sanaa Shenawi-Khalil, and Inna Popov. "New bismuth calcium oxysilicate with apatite structure: Synthesis and structural characterization." Journal of Solid State Chemistry 183, no. 7 (2010): 1484–89. http://dx.doi.org/10.1016/j.jssc.2010.04.028.

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39

Kim, Hojong, Dane A. Boysen, Takanari Ouchi, and Donald R. Sadoway. "Calcium–bismuth electrodes for large-scale energy storage (liquid metal batteries)." Journal of Power Sources 241 (November 2013): 239–48. http://dx.doi.org/10.1016/j.jpowsour.2013.04.052.

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40

Wang, Chun-Ming, Shujun Zhang, Jin-Feng Wang, Ming-Lei Zhao, and Chun-Lei Wang. "Electromechanical properties of calcium bismuth niobate (CaBi2Nb2O9) ceramics at elevated temperature." Materials Chemistry and Physics 118, no. 1 (2009): 21–24. http://dx.doi.org/10.1016/j.matchemphys.2009.06.022.

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41

He, Xijia, Jianbei Qiu, Yong Yang, Dacheng Zhou, Xuhui Xu, and Shengxian Wei. "Abnormal near-infrared luminescence property of bismuth doped calcium germanate glasses." Journal of Non-Crystalline Solids 402 (October 2014): 166–71. http://dx.doi.org/10.1016/j.jnoncrysol.2014.05.031.

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42

Yun, Sining, Xiaoli Wang, Jing Shi, Jianhui Zhu, and Delong Xu. "Ferroelectric properties of barium calcium titanate ceramics doped with bismuth oxide." Materials Letters 63, no. 21 (2009): 1883–85. http://dx.doi.org/10.1016/j.matlet.2009.06.004.

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43

Wendusu, Tetsuro Yoshida, Toshiyuki Masui, and Nobuhito Imanaka. "Novel environmentally friendly inorganic red pigments based on calcium bismuth oxides." Journal of Advanced Ceramics 4, no. 1 (2015): 39–45. http://dx.doi.org/10.1007/s40145-015-0129-1.

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44

Rama Sastry, P. S., G. S. Kumar, T. Bhimasankaram, and G. Prasad. "Pyroelectricity in calcium substituted sodium bismuth titanate layer structured ferroelectric ceramics." Bulletin of Materials Science 22, no. 1 (1999): 59–64. http://dx.doi.org/10.1007/bf02745676.

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45

Pradhan, A. K., P. C. Jana, and B. K. Roul. "Bismuth strontium calcium copper oxide high-TC superconductors from nitrate solutions." Physica Status Solidi (a) 110, no. 2 (1988): K93—K96. http://dx.doi.org/10.1002/pssa.2211100250.

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46

HALLSTEDT, B., D. RISOLD, and L. J. GAUCKLER. "ChemInform Abstract: Thermodynamic Assessment of the Bismuth-Calcium-Oxygen Oxide System." ChemInform 29, no. 2 (2010): no. http://dx.doi.org/10.1002/chin.199802256.

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47

Bosso-Martelo, Roberta, Juliane Maria Guerreiro-Tanomaru, Raqueli Viapiana, Fábio Luis Camargo Vilella Berbert, Maria Inês Basso Bernardi, and Mario Tanomaru-Filho. "Calcium Silicate-Based Cements Associated with Micro- and Nanoparticle Radiopacifiers: Physicochemical Properties and Bioactivity." International Scholarly Research Notices 2015 (February 23, 2015): 1–7. http://dx.doi.org/10.1155/2015/874283.

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Objective. The aim of this study was to evaluate the physicochemical properties and bioactivity of two formulations of calcium silicate-based cements containing additives (CSCM) or resin (CSCR), associated with radiopacifying agents zirconium oxide (ZrO2) and niobium oxide (Nb2O5) as micro- and nanoparticles; calcium tungstate (CaWO4); and bismuth oxide (Bi2O3). MTA Angelus was used as control. Methods. Surface features and bioactivity were evaluated by scanning electron microscopy and the chemical composition by energy dispersive X-ray spectrometry (EDS-X). Results. CSCM and CSCR presented la

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Guerreiro-Tanomaru, Juliane Maria, Ana Lívia G. Cornélio, Carolina Andolfatto, Loise P. Salles, and Mário Tanomaru-Filho. "pH and Antimicrobial Activity of Portland Cement Associated with Different Radiopacifying Agents." ISRN Dentistry 2012 (October 16, 2012): 1–5. http://dx.doi.org/10.5402/2012/469019.

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Objective. The aim of this study was to evaluate the antimicrobial activity and pH changes induced by Portland cement (PC) alone and in association with radiopacifiers. Methods. The materials tested were pure PC, PC + bismuth oxide, PC + zirconium oxide, PC + calcium tungstate, and zinc oxide and eugenol cement (ZOE). Antimicrobial activity was evaluated by agar diffusion test using the following strains: Micrococcus luteus, Streptococcus mutans, Enterococcus faecalis, Pseudomonas aeruginosa, and Candida albicans. After 24 hours of incubation at 37°C, inhibition of bacterial growth was observe

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Ryabov, A. V. "Mastering of production of lead-free ecologically clean free-machining steels." Ferrous Metallurgy. Bulletin of Scientific , Technical and Economic Information 75, no. 3 (2019): 337–43. http://dx.doi.org/10.32339/0135-5910-2019-3-337-343.

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Both in the domestic and world steel industry alternative ecologically clean free-cutting steels, having cutting machinability characteristics and mechanicalproperties, comparable with lead-containing steels, but voided of their drawbacks,are actively searched. First ofall the alternative steels should not be not so ecologically harmful. Scientific and technological aspects of lead-free free-machining steels production, alloyed by bismuth, calcium, tin, boron and nitrogen presented. Solubility of bismuth in iron and iron alloys with chromium, manganese, nickel, tungsten, vanadium, cobalt,phosp

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Farias, Italo de Lima, Eduardo Dias Ribeiro, Polyana Tarciana Araújo dos Santos, Rayane de Oliveira Gomes, Ana Cristina FIgueiredo de Melo Costa, and Criseuda Maria Benício Barros. "Obtaining bioceramic cements for dental repair procedures based on hydroxyapatite and bismuth oxide." Research, Society and Development 11, no. 4 (2022): e30411427315. http://dx.doi.org/10.33448/rsd-v11i4.27315.

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Introduction: The use of hydroxyapatite-based cements in dental and bone tissue regeneration procedures has shown favorable results. However, structural fragility and lower levels of radiopacity at clinical evaluation make it difficult to use in direct clinical procedures. Objective: This study aimed to synthesize a new cement with properties to be considered for use in dental repair procedures using hydroxyapatite and a hydrogel, with the addition of bismuth oxide as a radiopacifying agent. Methodology: The materials were obtained by a mixture of hydroxyapatite produced by the precipitation m

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