Journal
INORGANIC MATERIALS
Volume 54, Issue 12, Pages 1245-1249Publisher
MAIK NAUKA/INTERPERIODICA/SPRINGER
DOI: 10.1134/S0020168518120026
Keywords
indium germanate; yttrium indium germanate; high-temperature heat capacity; thermodynamic properties
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Funding
- Russian Federation Ministry of Education and Science (state research target for Siberian Federal University) [4.8083.2017/8.9, 007-00129-18-00]
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Polycrystalline In2Ge2O7 and YInGe2O7 samples have been prepared by solid-state reactions, by sequentially firing stoichiometric mixtures of In2O3, Y2O3, and GeO2 at temperatures from 1273 to 1473 K. The molar heat capacity of the indium and yttrium indium pyrogermanates has been determined by differential scanning calorimetry in the range 320-1000 K. The experimental C-p(T) data have been used to evaluate the enthalpy increment, entropy change, and reduced Gibbs energy of In2Ge2O7 and YInGe2O7.
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