热容
材料科学
焓
热力学
镝
大气温度范围
热膨胀
陶瓷
衍射
扫描电子显微镜
吉布斯自由能
单斜晶系
等温过程
绝热过程
退火(玻璃)
粉末衍射
标准摩尔熵
差热分析
分析化学(期刊)
结晶学
晶体结构
复合材料
化学
光学
无机化学
物理
色谱法
作者
П. Г. Гагарин,A. V. Guskov,V. N. Guskov,A. V. Tyurin,А. Хорошилов,К. С. Гавричев
标识
DOI:10.1016/j.ceramint.2020.09.072
摘要
Monoclinic dysprosium orthotantalate ceramics were synthesised by reverse co-precipitation followed by annealing at 1773 K and characterized by X-ray powder diffraction, scanning electron microscopy and chemical analysis. High-temperature X-ray diffraction was used to study change in the lattice parameters in the temperature range of 298–1273 K, and the volume expansion of M-DyTaO4 ceramics was calculated. The molar heat capacity of M-DyTaO4 was measured by adiabatic (9–346 K) and differential scanning (316–1336 K) calorimetries. The temperature dependences of entropy, enthalpy change and reduced Gibbs energy of M-DyTaO4 in the range of 0–1273 K were calculated based on smoothed heat capacity values, without taking into account the contribution of phase transformations occurring below 9 K. The general shape of the anomalous Schottky contribution to the molar heat capacity was determined.
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