Synthesis, Crystal Structure, and Thermodynamic Properties of the CaSm2Ge3O10 Germanate in the Range 320–1000 K

— The CaSm 2 Ge 3 O 10 germanate has been prepared by firing stoichiometric mixtures of CaCO 3 , Sm 2 O 3 , and GeO 2 in air in the temperature range 1423–1473 K. X-ray powder diffraction characterization with the use of the derivative difference minimization method has shown that CaSm 2 Ge 3 O 10 h...

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Bibliographic Details
Published in:Inorganic materials 2023, Vol.59 (1), p.93-97
Main Authors: Denisova, L. T., Galiakhmetova, N. A., Kargin, Yu. F., Golubeva, E. O., Beletskii, V. V., Denisov, V. M.
Format: Article
Language:English
Subjects:
Calcium carbonate
Chemistry
Chemistry and Materials Science
Crystal structure
Germanium oxides
High temperature
Industrial Chemistry/Chemical Engineering
Inorganic Chemistry
Materials Science
Samarium
Thermodynamic properties
Thermodynamics
Unit cell
X ray powder diffraction
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Summary:— The CaSm 2 Ge 3 O 10 germanate has been prepared by firing stoichiometric mixtures of CaCO 3 , Sm 2 O 3 , and GeO 2 in air in the temperature range 1423–1473 K. X-ray powder diffraction characterization with the use of the derivative difference minimization method has shown that CaSm 2 Ge 3 O 10 has a monoclinic structure (sp. gr. P 2 1 / c , 293 К) with unit-cell parameters a = 6.9779(8) Å, b = 6.92859(7) Å, c = 18.8907(2) Å, and β = 108.3280(8)°. The high-temperature heat capacity of calcium samarium germanate samples has been determined in the temperature range 320–1000 K by differential scanning calorimetry and the experimental C p ( T ) data have been used to evaluate thermodynamic properties of CaSm 2 Ge 3 O 10 .
ISSN:0020-1685
1608-3172
DOI:10.1134/S0020168523010065