Germanate NdGaGe2O7: Synthesis, Structure, and Thermophysical Properties

Polycrystalline samples of gallium neodymium germanate NdGaGe 2 O 7 were synthesized by solid-phase reactions from a stoichiometric mixture of oxides Nd 2 O 3 , Ga 2 O 3 , and GeO 2 under sequential stepwise calcination in the air at temperatures in the range 1273–1473 K. The heat capacity–temperatu...

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Veröffentlicht in:	Russian journal of inorganic chemistry 2020-05, Vol.65 (5), p.631-635
Hauptverfasser:	Denisova, L. T., Kargin, Yu. F., Irtyugo, L. A., Beletskii, V. V., Belousova, N. V., Denisov, V. M.
Format:	Artikel
Sprache:	eng
Schlagworte:	Chemical synthesis Chemistry Chemistry and Materials Science Enthalpy Gallium oxides Germanium oxides Inorganic Chemistry Neodymium Solid phases Temperature dependence Thermodynamics of Inorganic Compounds Thermophysical properties
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Zusammenfassung:	Polycrystalline samples of gallium neodymium germanate NdGaGe 2 O 7 were synthesized by solid-phase reactions from a stoichiometric mixture of oxides Nd 2 O 3 , Ga 2 O 3 , and GeO 2 under sequential stepwise calcination in the air at temperatures in the range 1273–1473 K. The heat capacity–temperature dependence for the synthesized samples was studied by differential scanning calorimetry in the range 350–1000 K. The experimental C p = f ( T ) data were used to calculate the thermodynamic functions (enthalpy, entropy, and reduced Gibbs energy changes) of NdGaGe 2 O 7 .
ISSN:	0036-0236 1531-8613
DOI:	10.1134/S0036023620050071