Abstract

The europium gallium germanate EuGaGe₂O₇ has been prepared by solid-state reaction in air in the temperature range 1273–1473 K using a stoichiometric mixture of Eu₂O₃, Ga₂O₃, and GeO₂. Its crystal structure has been determined by X-ray diffraction (sp. gr. P2₁/c, a = 7.1693(7) Å, b = 6.57008(6) Å, c = 12.7699(1) Å, β = 117.4522(5)°, V = 533.768(8) ų). The heat capacity of polycrystalline samples has been determined by differential scanning calorimetry in the temperature range 350–1053 K and the experimental data have been used to calculate the thermodynamic properties (enthalpy increment, entropy change, and reduced Gibbs energy change) of EuGaGe₂O₇.

中文翻译：

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EuGaGe 2 O 7的合成，结构和热物理性质

摘要

锗锗镓镓EuGaGe ₂ O ₇是通过在空气中在1273–1473 K的温度范围内使用Eu ₂ O ₃，Ga ₂ O ₃和GeO ₂的化学计量混合物进行固相反应制得的。其晶体结构已通过X射线衍射（SP确定。GR。P 2 ₁ / ç，一个= 7.1693（7），b = 6.57008（6），C ^ = 12.7699（1），β= 117.4522（ 5）°，V = 533.768（8）埃³）。多晶样品的热容已通过差示扫描量热法在350–1053 K的温度范围内确定，并且实验数据已用于计算EuGaGe ₂ O的热力学性质（焓增量，熵变和降低的吉布斯能量变化）₇。