Energetics and structure of the B‐type solid solution in the Nd 2 O 3 –Y 2 O 3 system
Energetics and structure of the B‐type solid solution in the Nd 2 O 3 –Y 2 O 3 system
复制标题
Nd 2 O 3 →Y 2 O 3 体系中B型固溶体的能量和结构
DOI：
10.1111/jace.18522
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发表时间：
2022
影响因子：
3.9
通讯作者：
Navrotsky, Alexandra
中科院分区：
文献类型：
--
作者：
Mandia, Ramandeep;Navrotsky, Alexandra
nd2o3 - y2o3体系包含几种不同结构的固溶相。在1873 K下形成了0.2≤x≤0.5$0.2 \le x \le 0.5$范围内的单相B型（Nd1−xYx） 2o3固溶体，并在冷却至环境温度时保持不变。他们显示了晶格参数的线性组成依赖性，使外推tox= 0和1与稳定端元的结构进行比较。用氧化物熔体溶液量热法测定的A型nd2o3和C型y2o3的正生成焓表明B型相的熵稳定。用常规溶液模型拟合得到B型固溶体混合的正相互作用参数Ω=$ =$ 47.46±4.04 kJ/mol。这个值比以前使用calpha方法进行相图分析得到的值明显更正。预计在1427 K以下会发生两个B型相的析出，这对于在低温下由其他结构主导的平衡相关系来说并不重要。
The system Nd2O3–Y2O3contains solid‐solution phases with several different structures. Single‐phase B‐type (Nd1−xYx)2O3solid solutions in the range of 0.2≤x≤0.5$0.2 \le x \le 0.5$ were formed at 1873 K and retained on cooling to ambient temperature. They showed a linear composition dependence of lattice parameters, enabling extrapolation tox= 0 and 1 for comparison with the structures of the stable endmembers. A positive enthalpy of formation from A‐type Nd2O3and C‐type Y2O3determined using oxide melt solution calorimetry indicated entropic stabilization of the B‐type phase. A positive interaction parameter for mixing in the B‐type solid solution,Ω=$ = $ 47.46 ± 4.04 kJ/mol, was obtained by fitting the data using a regular solution model. This value is significantly more positive than that obtained by previous phase diagram analysis using the CalPhaD approach. Exsolution into two B‐type phases is predicted to occur below 1427 K, making it unimportant for the equilibrium phase relations that will be dominated by other structures at low temperature.