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Journal articles on the topic 'Barium carbonates'

Author: Grafiati

Published: 4 June 2021

Last updated: 12 February 2022

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1

Whittaker, Michael L., Wenhao Sun, Danielle O. Duggins, Gerbrand Ceder, and Derk Joester. "Dynamic Barriers to Crystallization of Calcium Barium Carbonates." Crystal Growth & Design 21, no. 8 (2021): 4556–63. http://dx.doi.org/10.1021/acs.cgd.1c00433.

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2

Takiyama, K. "Coprecipitation between binary carbonates of alkaline earth elements at 90 C." Proceedings, annual meeting, Electron Microscopy Society of America 44 (August 1986): 848–49. http://dx.doi.org/10.1017/s0424820100145583.

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The coprecipitation of two compounds in the aqueous solution has been studied by means of electron microscopy and X-ray diffraction techniques and the morphological and crystallographic properties of the coprecipitated particles were discussed from the viewpoint of crystal chemistry. In the present investigation the coprecipitation of binary carbonates such as CaCO3-SrCO3, SrCO3-BaCO3 and BaCO3-CaCO3 was studied. Calcium carbonate precipitated as aragonite at high temperature in aqueous solution. Strontium and barium. carbonates precipitated as aragonite type crystals regardless of the reactio

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3

Taillades, Gilles, Ismahan Hachemi, Paul Pers, Julian Dailly, and Mathieu Marrony. "Synthesis and Characterizations of Barium Zirconate–Alkali Carbonate Composite Electrolytes for Intermediate Temperature Fuel Cells." Journal of Composites Science 5, no. 7 (2021): 183. http://dx.doi.org/10.3390/jcs5070183.

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Composite ionic conductors for intermediate temperature fuel cells (ITFC) were produced by a combination of yttrium-substituted barium zirconate (BaZr0.9Y0.1 O2.95, BZY) and eutectic compositions of alkali carbonates (Li2CO3, Na2CO3, and K2CO3, abbreviated L, N, K). These materials were characterized by X-ray diffraction, scanning electron microscopy, and impedance spectroscopy. The combination of BZY with alkali metal carbonate promotes the densification and enhances the ionic conductivity, which reaches 87 mS·cm−1 at 400 °C for the BZY–LNK40 composite. In addition, the increase of the conduc

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4

Ledentsova, N. E., I. P. Li, V. S. Petrov, and V. I. Kapustin. "Perspective nickel-oxide cathodes technologies for centimetric range microwave devices." Fine Chemical Technologies 11, no. 3 (2016): 74–81. http://dx.doi.org/10.32362/2410-6593-2016-11-3-74-81.

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Three technologies of nickel-oxide cathodes based on nickel powder and on barium-calciumstrontium triple carbonate powder for microwave ovens of the centimetric wave length range devices are suggested. The optimum fraction of nickel powder for the production of cathodes is 45-71 microns. The optimum content of the triple carbonate is 10%. The optimum pressure of pressing is 7 t/cm2. The optimum temperature of agglomeration is 1100°C for 10 min. The quality improvement and yield of suitable cathodes are provided by the use of agglomerates of nickel and triple carbonates. The agglomerates contai

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5

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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6

Lappas, Alexandros, Kosmas Prassides, A. Robert Armstrong, and Peter P. Edwards. "Strontium barium copper oxide carbonate (Sr2-xBaxCuO2(CO3)): a series of antiferromagnetic layered oxide carbonates." Inorganic Chemistry 32, no. 4 (1993): 383–85. http://dx.doi.org/10.1021/ic00056a008.

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7

Evans, N. G., and M. G. Hatnlyu. "Alkali Metal and Alkali Earth Carbonates at Microwave Frequencies, II: Microwave Heating of Barium Carbonate." Journal of Microwave Power and Electromagnetic Energy 33, no. 1 (1998): 27–30. http://dx.doi.org/10.1080/08327823.1998.11688356.

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8

Saito, Ayaka, Hiroyuki Kagi, Shiho Marugata, et al. "Incorporation of Incompatible Strontium and Barium Ions into Calcite (CaCO3) through Amorphous Calcium Carbonate." Minerals 10, no. 3 (2020): 270. http://dx.doi.org/10.3390/min10030270.

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Calcite is a ubiquitous mineral in nature. Heavy alkaline-earth elements with large ionic radii such as Sr2+ and Ba2+ are highly incompatible to calcite. Our previous study clarified that incompatible Sr2+ ions can be structurally incorporated into calcite through crystallization from amorphous calcium carbonate (ACC). In this study, we synthesized Sr-doped calcite with Sr/(Sr + Ca) up to 30.7 ± 0.6 mol% and Ba-doped calcite with Ba/(Ba + Ca) up to 68.6 ± 1.8 mol%. The obtained Ba-doped calcite samples with Ba concentration higher than Ca can be interpreted as Ca-containing barium carbonates w

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9

Sondi, Ivan, and Egon Matijević. "Homogeneous Precipitation by Enzyme-Catalyzed Reactions. 2. Strontium and Barium Carbonates†." Chemistry of Materials 15, no. 6 (2003): 1322–26. http://dx.doi.org/10.1021/cm020852t.

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10

Zeng, Zhen, Xiaohua Li, Yi Liu, Fang Huang, and Hui‐Min Yu. "High‐Precision Barium Isotope Measurements of Carbonates by MC ‐ ICP ‐ MS." Geostandards and Geoanalytical Research 43, no. 2 (2019): 291–300. http://dx.doi.org/10.1111/ggr.12256.

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11

Criado, J. M., M. J. Dianez, M. Macias, and M. C. Paradas. "Crystalline structure and thermal stability of double strontium and barium carbonates." Thermochimica Acta 171 (November 1990): 229–38. http://dx.doi.org/10.1016/0040-6031(90)87023-6.

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12

Abdul Rahman, Hamimah, Linda Agun, and Mohamed Hakim Ahmad Shah. "Ba- and La- Strontium Cobalt Ferrite Carbonate Composite as Cathode Materials for Low Temperature SOFC." Key Engineering Materials 694 (May 2016): 125–29. http://dx.doi.org/10.4028/www.scientific.net/kem.694.125.

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Barium strontium cobalt ferrite (BSCF) and lanthanum strontium carbonate ferrite (LSCF)–samarium-doped ceria carbonate (SDCc) composite cathodes were developed based on various molar ratio of binary carbonate. The percentage of molar ratio for (Li/Na)2 binary carbonate in the composite cathodes were 67:33, 62:38, and 53:47. Influence of (Li/Na)2 binary carbonate addition on BSCF-SDCc and LSCF-SDCc were studied in terms of chemical, thermal, and physical properties. The composite-cathode powders were prepared using high-energy ball milling (HEBM) and followed by calcination at 750 °C for 2h. Ch

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13

Rychagov, S. N., E. I. Sandimirova, M. S. Chernov, O. V. Kravchenko, and E. V. Kartasheva. "The Composition, Structure, and Origin of Carbonate Concretions Sampled in the South Kambalnyi Central Thermal Field, Kamchatka." Journal of Volcanology and Seismology 15, no. 4 (2021): 258–72. http://dx.doi.org/10.1134/s0742046321040059.

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Abstract Carbonate concretions are formed at the base of a sequence of hydrothermal clay in the South Kambalnyi Central Thermal Field situated in the southern part of the Kambalnyi volcanic mountain range, Kamchatka. The concretions have complex chemical and mineral compositions: apart from aragonite which is the main component of each layer, the chemical compounds identified there include oxides of iron and silicon, sulfates of calcium and barium, sulfides of iron and other metals, carbonates of iron and manganese, siliceous ferromanganese formations, nitrogen compounds, and phosphates of cal

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14

Earnest, Charles M., and Ethan T. Miller. "An assessment of barium and strontium carbonates as temperature and enthalpy standards." Journal of Thermal Analysis and Calorimetry 130, no. 3 (2017): 2277–82. http://dx.doi.org/10.1007/s10973-017-6539-2.

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15

Stojanovic, Biljana, C. R. Foschini, M. A. Zaghete, et al. "Effect of Nb on barium titanate prepared from citrate solutions." Science of Sintering 34, no. 1 (2002): 63–71. http://dx.doi.org/10.2298/sos0201063s.

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The influence of the addition of dopants on the microstructure development and electrical properties of BaTiO3 doped with 0.2, 0.4, 0.6, 0.8 mol% of Nb and 0.01 mol% of Mn based compounds was studied. Doped barium titanate was prepared using the polymeric precursor method from citrate solutions. The powders calcined at 700?C for 4 hours were analysed by infrared (IR) spectroscopy to verify the presence of carbonates, and by X-ray diffraction (XRD) for phase formation. The phase composition, microstructure and dielectric properties show a strong dependence on the amount of added niobium.

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16

Jeske, Agnieszka. "Mobility and distribution of barium and strontium in profiles of podzolic soils." Soil Science Annual 64, no. 1 (2013): 2–7. http://dx.doi.org/10.2478/ssa-2013-0001.

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Abstract The study was aimed at determining the content, distribution and mobility of barium and strontium in various forest podzol soils. Samples with a wide range of chemical and physical properties were collected from typical uncontaminated soils of south-western Poland. The total metal content in the analyzed soils was considered as the geochemical background thanks to the natural features of the study site. Sequential chemical extraction procedure were used to provide information on the mobility and bioavailability of the studied metals in the soil. Fractions of Ba and Sr were determined

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17

Agafonov, Alexandr V., Konstantin V. Ivanov, and Olga V. Alekseeva. "LOW-TEMPERATURE SYNTHESIS OF BARIUM TITANITE IN AQUEOUS SOLUTION." IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENIY KHIMIYA KHIMICHESKAYA TEKHNOLOGIYA 61, no. 12 (2018): 56–62. http://dx.doi.org/10.6060/ivkkt.20186112.5720.

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Barium titanate powder with average particle size near 300 nm was produced using the low-temperature synthesis. It was established using scanning electron microscopy that at the thermal treatment, the particles gradually decrease with the formation of polydisperse aggregates. Based on the thermogravimetric analysis of the synthesized powder held in air for 4 months, it was shown that along with the low-temperature phase, the sample contains a high-temperature phase of carbonates, which removes at ~ 900 °C. Sorption characteristics of barium titanate thermally treated at various temperatures we

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18

YOKOFUJITA, Keiko, and Kazuyoshi TAKIYAMA. "Coprecipitation of calcium and barium carbonates by carbon dioxide gas at 80.DEG.C." Analytical Sciences 1, no. 4 (1985): 369–71. http://dx.doi.org/10.2116/analsci.1.369.

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19

CRIADO, J. M., M. J. DIANEZ, M. MACIAS, and M. C. PARADAS. "ChemInform Abstract: Crystalline Structure and Thermal Stability of Double Strontium and Barium Carbonates." ChemInform 22, no. 8 (2010): no. http://dx.doi.org/10.1002/chin.199108028.

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20

Golmohammad, M., A. Nemati, and M. A. Faghihi Sani. "SYNTHESIS AND DIELECTRIC PROPERTIES OF NANOCRYSTALLINE BASRTIO3." International Journal of Modern Physics: Conference Series 05 (January 2012): 188–95. http://dx.doi.org/10.1142/s2010194512002012.

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Ba 0.7 Sr 0.3 TiO 3 was prepared via simple sol-gel method by using titanium tetrabutoxide, barium and strontium carbonates, citric acid and ethylene glycol as starting materials. Simultaneous Thermal Analysis (STA) was used to examine thermal behavior of xerogel. The crystallite size of BST was about 21nm calculated by X-Ray diffraction (XRD) and confirmed by transition electron microscopy (TEM). Using these nanocrystalline powders, BST pellets were prepared and sintered in various temperatures. The grain size effect on electrical properties was studied and found that as the grain size decrea

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21

Prasad, T. P. "Heats of reaction of FeSO4 · 7 H2O with sodium, potassium, rubidium, strontium and barium carbonates." Thermochimica Acta 90 (August 1985): 353–54. http://dx.doi.org/10.1016/0040-6031(85)87115-x.

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22

Deuel, L. E., and G. H. Holliday. "Geochemical Partitioning of Metals in Spent Drilling Fluid Solids." Journal of Energy Resources Technology 120, no. 3 (1998): 208–14. http://dx.doi.org/10.1115/1.2795037.

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Metals in oil and gas fluids have been of concern to the environmental and industrial communities since 1976. As a result, metals in 31 spent drilling fluids representative of the major oil and gas production provinces in the Continental United States, were fractionated into exchangeable, bound to carbonates, bound to Fe-Mn oxides, bound to organic matter, and residual forms using a sequential extraction (summation of fractions) technique. Bioavailability and mobility of metals in solid matrices follow in sequence of the operational defined fractions with chemical reactivity decreasing in the

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23

Judd, M. D., and M. I. Pope. "The formation and surface properties of electron emissive coatings VIII. Structure of strontium-barium double carbonates." Journal of Applied Chemistry and Biotechnology 21, no. 10 (2007): 285–86. http://dx.doi.org/10.1002/jctb.5020211004.

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24

Pasierb, P., R. Gajerski, S. Komornicki, and M. Rękas. "Reactivity of lithium and barium carbonates with ZrO2:Y2O3and Nasicon in solid state electrochemical gas sensors." Journal of Thermal Analysis and Calorimetry 77, no. 1 (2004): 105–13. http://dx.doi.org/10.1023/b:jtan.0000033193.98853.d0.

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25

Bowmer, T. N., and F. K. Shokoohi. "Synthesis of superconductors from metal neodecanoates." Journal of Materials Research 6, no. 4 (1991): 670–76. http://dx.doi.org/10.1557/jmr.1991.0670.

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Metal-organic precursors can facilitate the production of superconducting thin films on large area substrates for microelectronic device applications. This paper describes the chemistry that occurs during the thermal processing of yttrium-, barium-, and copper-neodecanoate mixtures into a superconducting material, YBa2Cu3O7−x. Intermediates such as metal carbonates and oxides are identified by combining thermogravimetry with infrared spectral and x-ray diffraction analysis. Changing from argon to oxygen atmospheres increased decomposition rates and metal oxide formation. We found that (1) a lo

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26

Urbanovich, N. I., T. I. Bendik, K. E. Baranovsky, and E. V. Rozenberg. "Assessment of influence of input method of modifying additive in the coating of electrode on their welding-technological properties and mechanical properties of the weld metal." Litiyo i Metallurgiya (FOUNDRY PRODUCTION AND METALLURGY), no. 1 (April 10, 2019): 119–23. http://dx.doi.org/10.21122/1683-6065-2019-1-119-123.

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A comparative analysis and assessment of the impact of the method of introducing the modifying additive in the form of dispersed and ultrafine particles into the electrode coating on their welding-technological properties and mechanical properties of the weld metal is carried out. It has been established that a modifying additive containing such chemical elements as barium, strontium, potassium, silicon, aluminum, vanadium is a mixture of stable alkaline-earth metal compounds in the form of carbonates and is inserted into the coating of the electrodes by applying its dry mixture into the compo

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27

Priya Vadhana, K. T., S. Parveen, B. Ushadevi, R. Selvakumar, S. Sangeetha, and S. Vairam. "New barium, strontium and strontium-doped barium squarates: synthesis, crystal structures and DNA/BSA binding, antioxidant and in vitro cytotoxicity studies." Acta Crystallographica Section C Structural Chemistry 75, no. 8 (2019): 1091–101. http://dx.doi.org/10.1107/s2053229619009082.

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A new set of differently hydrated barium and strontium squarates, namely poly[[triaqua(μ-1,2-dioxocyclobut-3-ene-1,2-diolato)barium] monohydrate], {[Ba(C4O4)(H2O)3]·H2O} n (1), poly[[diaqua(μ-1,2-dioxocyclobut-3-ene-1,2-diolato)strontium] monohydrate], {[Sr(C4O4)(H2O)2]·H2O} n (2), and poly[[triaqua(μ-1,2-dioxocyclobut-3-ene-1,2-diolato)barium/strontium(0.85/0.15)] monohydrate], {[Ba0.85Sr0.15(C4O4)(H2O)3]·H2O} n (3), is reported. The study of their crystal structures indicates that all the complexes crystallize in the triclinic space group P\overline{1}. Complexes 1 and 3 have a rare combinat

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Prieto, M., L. Fernández-Diaz, L. López-Andrés, and S. López-Andrés. "Supersaturation evolution and first precipitate location in crystal growth in gels; application to barium and strontium carbonates." Journal of Crystal Growth 98, no. 3 (1989): 447–60. http://dx.doi.org/10.1016/0022-0248(89)90161-9.

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29

Garbarz-Glos, B., A. Lisińska-Czekaj, D. Czekaj, and W. Bąk. "Effect of Semiconductor Element Substitution on the Electric Properties of Barium Titanate Ceramics." Archives of Metallurgy and Materials 61, no. 2 (2016): 887–90. http://dx.doi.org/10.1515/amm-2016-0150.

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Abstract The investigated ceramics were prepared by a solid-state reaction from simple oxides and carbonates with the use of a mixed oxide method (MOM). The morphology of BaTi0.96Si0.04O3 (BTSi04) ceramics was characterised by means of a scanning electron microscopy (SEM). It was found that Si+4 ion substitution supported the grain growth process in BT-based ceramics. The EDS results confirmed the high purity and expected quantitative composition of the synthesized material. The dielectric properties of the ceramics were also determined within the temperature range (ΔT=130-500K). It was found

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30

Hayri, E. A., M. Greenblatt, K. V. Ramanujachary, et al. "Magnetic, electrical, and microstructural properties of YBa2Cu3O7: A comparison of sol-gel, co-precipitated, and solid state processing routes." Journal of Materials Research 4, no. 5 (1989): 1099–102. http://dx.doi.org/10.1557/jmr.1989.1099.

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Samples of YBa2Cu3O7 were prepared by sol-gel, co-precipitation, and solid state processes. Sol-gel samples were prepared from a solution of yttrium, barium, and copper nitrates dissolved in ethylene glycol, co-precipitated samples were made by the amorphous citrate method, and solid state samples were prepared by conventional high temperature reaction of the appropriate metal oxides and carbonates. The sol-gel process was shown to yield superconducting samples of superior Meissner effect, critical current, and critical field. The co-precipitated samples contain impurities that affect the crit

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31

L’vov, Boris V., and Valery L. Ugolkov. "Kinetics of free-surface decomposition of magnesium, strontium and barium carbonates analyzed thermogravimetrically by the third-law method." Thermochimica Acta 409, no. 1 (2004): 13–18. http://dx.doi.org/10.1016/s0040-6031(03)00322-8.

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32

Prasad, T. P. "Thermal decomposition of iron(II) sulphate heptahydrate in air in the presence of calcium, strontium and barium carbonates." Journal of Thermal Analysis 34, no. 3 (1988): 801–9. http://dx.doi.org/10.1007/bf02331782.

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33

Senna, Mamoru, Chie Ando, Mirjana Vijatovic-Petrovic, Jelena Bobic, and Biljana Stojanovic. "Organic crystals: More than simple additives toward better electroceramic materials." Processing and Application of Ceramics 4, no. 3 (2010): 183–91. http://dx.doi.org/10.2298/pac1003183s.

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Roles of various organic crystals (OC), notably those containing nitrogen, on the preparation and properties of source materials for electroceramics are featured from the author's own experimental studies. When OC are intimately mixed with metal salts like carbonates, their decomposition is accelerated, liberating the diffusing species at temperatures lower than usual. Mixing of OC with metal oxides under mechanical stressing results in anion exchange and eases diffusion of guest species. Case studies on 3 categories, i.e. i) substitution of oxygen in titania with nitrogen and introduction of

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34

Cuéllar-Cruz, Mayra, and Abel Moreno. "The Role of Calcium and Strontium as the Most Dominant Elements during Combinations of Different Alkaline Earth Metals in the Synthesis of Crystalline Silica-Carbonate Biomorphs." Crystals 9, no. 8 (2019): 381. http://dx.doi.org/10.3390/cryst9080381.

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The origin of life from the chemical point of view is an intriguing and fascinating topic, and is of continuous interest. Currently, the chemical elements that are part of the different cellular types from microorganisms to higher organisms have been described. However, although science has advanced in this context, it has not been elucidated yet which were the first chemical elements that gave origin to the first primitive cells, nor how evolution eliminated or incorporated other chemical elements to give origin to other types of cells through evolution. Calcium, barium, and strontium silica-

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35

André, Laurie, and Stéphane Abanades. "Evaluation and performances comparison of calcium, strontium and barium carbonates during calcination/carbonation reactions for solar thermochemical energy storage." Journal of Energy Storage 13 (October 2017): 193–205. http://dx.doi.org/10.1016/j.est.2017.07.014.

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36

Novoselova, Inessa, and Serhii Kuleshov. "PHYSICO-CHEMICAL BASES OF ELECTROLYTIC SYNTHESIS OF CARBON NANOMATERIALS FROM MOLTEN SALTS. Part 1." Ukrainian Chemistry Journal 85, no. 2 (2019): 69–79. http://dx.doi.org/10.33609/0041-6045.85.2.2019.69-79.

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An analysis of the decomposition potentials of lithium, sodium, potassium, calcium, barium, and magnesium carbonates with different versions of cathode products (elemental carbon, carbon monoxide, metal and carbide) in the range of 300-1900 K showed that for K2CO3 deposition of alkali metal on the cathode is most energetically profitable process at all temperatures. For Na2CO3 it is possible to obtain carbon at T < 1000 K. With temperature increase, the predominant process is the reduction of alkali metal. For Li2CO3, CaCO3, BaCO3, MgCO3 at T < 950 °C carbon deposition will be more advan

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37

Baldermann, Andre, Andrea Grießbacher, Claudia Baldermann, et al. "Removal of Barium, Cobalt, Strontium, and Zinc from Solution by Natural and Synthetic Allophane Adsorbents." Geosciences 8, no. 9 (2018): 309. http://dx.doi.org/10.3390/geosciences8090309.

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The capacity and mechanism of the adsorption of aqueous barium (Ba), cobalt (Co), strontium (Sr), and zinc (Zn) by Ecuadorian (NatAllo) and synthetic (SynAllo-1 and SynAllo-2) allophanes were studied as a function of contact time, pH, and metal ion concentration using kinetic and equilibrium experiments. The mineralogy, nano-structure, and chemical composition of the allophanes were characterized by X-ray diffraction, Fourier transform infrared spectroscopy, transmission electron microscopy, and specific surface area analyses. The evolution of adsorption fitted to a pseudo-first-order reaction

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38

Lin, Yi-Bo, Hai-Zhen Wei, Shao-Yong Jiang, et al. "Accurate Determination of Barium Isotopic Compositions in Sequentially Leached Phases from Carbonates by Double Spike-Thermal Ionization Mass Spectrometry (DS-TIMS)." Analytical Chemistry 92, no. 3 (2019): 2417–24. http://dx.doi.org/10.1021/acs.analchem.9b03137.

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39

Pan, Mengdi, Daidai Wu, Fei Yang, Tiantian Sun, Nengyou Wu, and Lihua Liu. "Geochemical sedimentary evidence from core 973-2 for methane activity near the Jiulong Methane Reef in the northern South China Sea." Interpretation 6, no. 1 (2018): T163—T174. http://dx.doi.org/10.1190/int-2017-0001.1.

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The Jiulong Methane Reef, located on the northern slope of the South China Sea, is characterized by several features, such as bottom-simulating reflections and authigenic carbonates, which are indicative of methane seeps that are currently occurring as well as those that occurred in the past. However, to date, the effect that these methane seeps have on the sedimentary environment is not completely clear. To provide further insights into the biogeochemical processes involved in methane seeps, a 6.73 m piston core (973-2) was retrieved from this area in 2011 to perform an in-depth analysis. The

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40

Karlina, Olga, Michael Ojovan, Galina Pavlova, and Vsevolod Klimov. "Thermodynamic modeling and experimental tests of irradiated graphite molten salt decontamination." MRS Proceedings 1518 (2013): 103–8. http://dx.doi.org/10.1557/opl.2013.72.

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ABSTRACTMolten salt flameless oxidation of graphite is one of the prospective methods of irradiated graphite waste processing. Molten salts are capable to retain a considerable part of radionuclides, to neutralize acidic off gases, moreover spent salts could be vitrified on completion of the process. We have used thermodynamic modelling to assess the efficiency of molten salt oxidation of graphite. Equilibrium compositions of both the melt and the off gas were calculated depending on graphite content and temperature. The feasibility of decontaminating the irradiated graphite of its near-surfac

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41

Heywood, Brigid R. "Biomineralization:New directions in crystal science." Proceedings, annual meeting, Electron Microscopy Society of America 50, no. 2 (1992): 1026–27. http://dx.doi.org/10.1017/s0424820100129760.

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The development of effective protocols for the reproducible control of crystal structure, size and morphology is attracting considerable interest given the requirement for particles of modal size and shape in many areas of materials fabrication and the importance of crystallochemical selectivity in determining the exploitable properties (eg. optical, magnetic, electrokinetic) of inorganic solids. In biological systems their are many examples of advanced “crystal engineering” in which inorganic solids are deposited in a highly controlled manner to produce mineral phases that are unique with res

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Bittarello, Erica, and Dino Aquilano. "Self-assembled nanocrystals of barium carbonate in biomineral-like structures." European Journal of Mineralogy 19, no. 3 (2007): 345–51. http://dx.doi.org/10.1127/0935-1221/2007/0019-1730.

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Merie, Violeta, Viorel Cândea, and Catalin Popa. "The Influence of Barium Carbonate on the Tribological Characteristics of some Iron-Based Friction Composites." Advanced Engineering Forum 13 (June 2015): 67–74. http://dx.doi.org/10.4028/www.scientific.net/aef.13.67.

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New iron-based composite materials with addition of barium carbonate (2 to 8 wt% barium carbonate) for friction applications are investigated. The tribological behavior of the studied materials was determined by a pin-on-disk method when a cast iron disk was employed. The addition of 2 wt% barium carbonate determined a significant increase of the average friction coefficient. Instead a further increase of barium carbonate content determined a gradual decrease of this parameter. The improvement of wear resistance was marked out for a barium carbonate content of up to 6 wt%. The optimal ratio be

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Zhang, Xiang, Xin Chen, Ming Hui Feng, Zai Fang Zheng, Gong Pei Pan, and Hui Ping Lv. "Influences of Bulking and Porous Structure on Barium Nitrate as Pyrotechnic Oxidants." Advanced Materials Research 550-553 (July 2012): 27–31. http://dx.doi.org/10.4028/www.scientific.net/amr.550-553.27.

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An experimental investigation was carried out to explore the major physical and chemical properties of expanded barium nitrate. Expanded barium nitrate with porous structure was made. The method is as follows: moderately evaporate the solution of barium nitrate and inorganic vesicant; heat the crystallized mixture to decompose the inorganic vesicants. The inorganic vesicants are potassium carbonate, sodium carbonate, ammonium carbonate, ammonium oxalate, potassium acetate, ammonium acetate and ammonium perchlorate. The SEM shows that the modified barium nitrate with potassium carbonate has obv

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Schorn, Th F., Ch Olbricht, A. Schüler, et al. "Barium carbonate intoxication." Intensive Care Medicine 17, no. 1 (1991): 60–62. http://dx.doi.org/10.1007/bf01708412.

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Takiyama, K. "Coprecipitation of barium sulfate and barium carbonate at 80°C." Proceedings, annual meeting, Electron Microscopy Society of America 45 (August 1987): 352–53. http://dx.doi.org/10.1017/s042482010012655x.

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The coprecipitation of two sparingly soluble compounds in the aqueous solution has been studied by means of electron microscopy and x-ray diffraction techniques, and the properties of the particles produced by the coprecipitation were discussed as an issue in crystal chemistry. In the present investigation the coprecipitation of barium sulfate and barium carbonate was studied. Both crystals belong to the orthorhombic system. The lattice constants of barium sulfate are ao=8.878, bo=5.450 and co=7.152 Å. Those of barium carbonate are ao=5.314, bo=8.902 and co=6.430 Å. The ratio of the lattice co

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Shahid, Tauseef, Muhammad Arfan, Aurang Zeb, Tayyaba BiBi, and Taj Muhammad Khan. "Preparation and physical properties of functional barium carbonate nanostructures by a facile composite-hydroxide-mediated route." Nanomaterials and Nanotechnology 8 (January 1, 2018): 184798041876177. http://dx.doi.org/10.1177/1847980418761775.

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Recently, barium carbonate nanomaterial has been shown to be a proven versatile candidate for the catalysis and sensor applications. The catalytic and sensing efficiency can be improved by making barium carbonate composite with a suitable transition element. In this regard, the preparation of barium carbonate and its composite with nickel during the synthesis process is presented with the composite-hydroxide-mediated method, an effective, feasible, and low-temperature synthesis route. The nanomaterial produced is monitored for the structural and optical properties with various diagnostic metho

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Ghorai, S., G. K. Mandal, S. Roy, et al. "Treatment of LF slag to prevent powdering during cooling." Journal of Mining and Metallurgy, Section B: Metallurgy 53, no. 2 (2017): 123–30. http://dx.doi.org/10.2298/jmmb160226004g.

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The polymorphic transformation of the monoclinic ?-polymorph to the orthorhombic ?-polymorph of di-calcium silicate at around 500?C during cooling results in disintegration of slag. The slag generated, during the production of thermo mechanically treated steel in ladle furnace at M/s Tata Steel Limited, Jamshedpur, India, behaves in similar manner. An attempt has been made to prevent the crumbling of ladle furnace slag. The experiments were conducted in 10 kg air induction furnace. Various types of silica source were used to prevent the disintegration of ladle furnace slag by reducing the basi

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Grzesiak, M., A. Rafalska-Łasocha, and W. Łasocha. "Synthesis and XRPD studies of new barium dicarboxylates." Powder Diffraction 26, no. 1 (2011): 53–65. http://dx.doi.org/10.1154/1.3548073.

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New salts of barium with dicarboxylic acids (glutaric, adipic, pimelic, suberic, sebacic, and dodecanedioic) were synthesized and characterized by powder diffraction techniques. In addition to the basic crystallographic data and chemical analyses of barium glutarate hexahydrate {1}, barium adipate {2}, barium pimelate {3}, barium disuberate {4}, barium sebacate {5}, and barium dodecanedioate {6}, the processes of their thermal decomposition were investigated by XRPD. All the compounds decompose to barium carbonate at temperatures between 400 and 500 °C.

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Gomes, Maria da Conceição, Danilo Melo, Maíra da Costa, José Ângelo dos Anjos, Michael Trinta, and Itabaraci Cavalcante. "Análise geoquímica das águas subterrâneas no município de Boquira, no semiárido baiano - Brasil." Geochimica Brasiliensis 35, no. 1 (2021): 7–16. http://dx.doi.org/10.21715/gb2358-2812.2021351007.

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The geochemical analysis was carried out in the center-south portion of the state of Bahia, in the semi-arid region of Bahia, where outcrop the Paramirim Complex, Boquira Unit, Boquira Granite, Veredinha Granite, Serra do Espinhaço, detritus coverings and alluvial deposits. The Boquira Unit is known for lead-zinc mineralization. In this unit operated the Boquira mine, considered the largest lead and zinc mine in Brazil, until it was suddenly abandoned, leaving significant environmental liabilities of toxic metals such as lead, zinc, silver, barium, copper, chromium and nickel. To characterize

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