Results 251 to 260 of about 7,660 (299)

Effective thermal conductivity of porous strontium oxide and strontium carbonate samples

Journal of Applied Physics, 1999
The thermal diffusivity of some pressed powder strontium oxide (SrO) and strontium carbonate (SrCO3) samples has been measured from room temperature to 1400 °C in vacuum and in an argon atmosphere using the laser flash technique. The structures of the samples have been analyzed using a scanning electron microscope and a theoretical model has been ...
H. Szelagowski, I. Arvanitidis, S. Seetharaman   +2 more
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Surfactants-Controlled Morphosynthesis of Strontium Carbonate

Advanced Materials Research, 2011
The controlled synthesis of SrCO3 microstructures with different morphologies, such as flower-like, cauliflower-like and finger-like, were successfully achieved in the presence of mixed nonionic/anionic surfactants polyoxyethylene (20) sorbitan monolaurate (Tween20) and sodium dodecyl sulfate (SDS).
Chao You, Qiang Zhang, Yun Zhao, Qing Ze Jiao   +3 more
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The carbonate location in mixed calcium and strontium carbonated apatites

Polyhedron, 2020
Abstract Mixed calcium/strontium carbonated apatites were obtained by aqueous addition of mixtures of calcium and strontium nitrate to NH4H2PO4 and Na2CO3 in the presence of both low and high sodium concentrations. The calcium: strontium ratios in the products were obtained by xrf and carbonate percentages by combustion analysis.
Claude H. Yoder, Xueying Lyu
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Les halogeno-carbonates de strontium

Journal of Inorganic and Nuclear Chemistry, 1969
Abstract In the SrX2SrCO3 (X  Cl, Br, I) binary systems a Sr3Br4Co3 orthorhombic phase isotypical with the baryum Ba3X4CO3 phases and a new metastable Sr4Cl6CO3 phase were made in evidence. Crystallographic data and thermal stability are determined.
Bernard Frit, Mohamed Moakil Chbany
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Preparation of strontium carbonate from celestite

Mineral Processing and Extractive Metallurgy, 2000
AbstractA novel method for the preparation of strontium carbonate from celestite ore has been investigated. The ore is reduced by brown coal at a temperature of 1000°C for a period of 3 h. The reduced product is leached with water at a liquid : solid ratio of 3 : 1 at 90°C and the slurry is then leached with hydrochloric acid at a solid : liquid ratio ...
Wen Chen, Yun Zhu
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The solubility of strontium carbonate in water

Journal of the Chemical Society, Dalton Transactions, 1972
Values have been determined for the solubility of SrCO3 in water, by use of both radiometric and flame emission spectrophotometric methods. The two methods gave essentially identical results. For water free from atmospheric CO2 the solubilities/mg I–1 were 5·34 ± 0·014 at 5 °C, 6·94 ± 0·018 at 15 °C, and 8·95 ± 0·029 at 25 °C.
D. L. Miles, J. D. Burton
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Luminescence and EPR studies on strontium carbonate obtained by thermal decomposition of strontium oxalate

Journal of Physics and Chemistry of Solids, 1986
Abstract Strontium carbonate with self-activated luminescence in the short-wave length region λ max = 490 nm is obtained by thermal decomposition of pure SrC 2 O 4 · H 2 O at 530°C. By means of EPR, CO 2 − radicals are found in the luminescent strontium carbonate, which are stabilized in anion sites and interstitial positions of the lattice.
S. Angelov, R. Stoyanova, R. Dafinova, K. Kabasanov   +3 more
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Solid-state reaction between strontium carbonate and silica

Journal of the Chemical Society, Dalton Transactions, 1981
Metastable SrSiO3 was formed during the course of the reaction between an equimolar mixture of SrCO3 and SiO2. The reaction was found to proceed in four stages, (1)–(4). The overall reaction of (1) and (2) was best described 2 SrCO3+ SiO2→ Sr2SiO4+ 2 CO2(1), SrCO3+ SiO2→ SrSiO3(metastable)+ CO2(2), SrSiO3(metastable) [graphic omitted] SrSiO3(stable)(3),
Osamu Yamaguchi, Kazuhide Yabuno, Shigeru Yamamoto, Kiyoshi Shimizu   +3 more
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Absorption of strontium cations by a carbon nanomatrix

Coke and Chemistry, 2015
The structure and adsorption properties a new micro- and nanostructured carbon matrix are studied. The sorptional capacity of the matrix is 65 mg/g for strontium (II) cations; the moisture absorption is 285.7 mg/g. The matrix effectively removes the strontium cations from aqueous solution. This suggests that it might prove useful in the purification of
G. R. Mongush, V. I. Kotelnikov, A. V. Barinov   +2 more
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Strontium, Magnesium, and Manganese in Fossil Foraminiferal Carbonates

The Journal of Geology, 1964
The fraction greater than $62 \mu$ was separated from three deep sea cores, the calcium carbonate put into solution, and calcium, strontium, magnesium, and manganese determined in the calcium carbonate fraction. Strontium and magnesium were relatively constant in this carbonate fraction, but manganese showed a significant increase with depth in core.
Peter J. Wangersky, Oiva Joensuu
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