Abstract A sample of dysprosium selenide (Dy2Se3) was synthesized and characterized by various physicochemical methods. The heat capacity of Dy2Se3 has been measured in the temperature range from T = 4.85 K to T = 301.11 K using adiabatic calorimetry. Two pronounced λ-anomalies with maxima at temperatures TC1 = 6.20 K and TC2 = 219.40 K were found in the functional behavior of the heat capacity. In addition, the heat capacity of Dy2Se3(cr) showed a continuing excess value consistent with a Schottky anomaly on energy levels lying roughly from 0 to 425 cm−1 above the ground state. On the basis of experimental data on the heat capacity, the values of entropy, enthalpy and reduced Gibbs energy were calculated in the interval from T = 0 to T = 301 K, and the anomalous contribution to these properties was determined. The value of the absolute entropy obtained was used for calculation of Dy2Se3(cr) entropy formation at T = 298.15 K.

中文翻译：

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硒化镝Dy2Se3的低温热容和热力学函数

摘要 合成了硒化镝 (Dy2Se3) 样品，并通过各种物理化学方法对其进行了表征。已使用绝热量热法在 T = 4.85 K 至 T = 301.11 K 的温度范围内测量了 Dy2Se3 的热容量。在热容量的功能行为中发现了两个明显的 λ 异常，其最大值在温度 TC1 = 6.20 K 和 TC2 = 219.40 K。此外，Dy2Se3(cr) 的热容量显示出持续的超额值，这与位于基态上方大约 0 到 425 cm-1 的能级上的肖特基异常一致。根据热容量的实验数据，计算了 T = 0 到 T = 301 K 区间内的熵、焓和折减吉布斯能的值，并确定了对这些特性的异常贡献。