Abstract

Polycrystalline samples of gallium neodymium germanate NdGaGe₂O₇ were synthesized by solid-phase reactions from a stoichiometric mixture of oxides Nd₂O₃, Ga₂O₃, and GeO₂ 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 NdGaGe₂O₇.

中文翻译：

---

锗酸盐NdGaGe 2 O 7：合成，结构和热物理性质

摘要

锗酸钕钕NdGaGe ₂ O _7的多晶样品是通过固相反应从Nd ₂ O ₃，Ga ₂ O ₃和GeO ₂的化学计量混合物在空气中于1273– 1473K。通过差示扫描量热法研究了合成样品的热容量-温度依赖性，其范围为350–1000K。实验C _p = f（T）数据用于计算热力学函数（焓，熵和NdGaGe _2的吉布斯能量变化减小）O ₇。