Abstract

The temperature dependences of the specific heat of nanoscale (nanocluster) cobaltite(nickelite)-cuprate-manganites LaSrCoCuMnO₆ and LaSrNiCuMnO₆ have been studied via experimental dynamic calorimetry in the range of 298.15–673 K. The temperature dependences of the specific heat \({C}_{p}^{\circ }\) ~ f(T) of LaSrCoCuMnO₆ (at 323 and 523 K) and LaSrNiCuMnO₆ (at 348 K) exhibit anomalous jumps in the specific heat, which are likely due to the second-order phase transitions. Based on the experimental data on \({C}_{p}^{\circ }\)(T) and the calculated value of entropy S°(298.15), the temperature dependences of the specific heat and thermodynamic functions of the studied compounds are calculated in the temperature range of 298.15–673 K.

中文翻译：

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钴铁酸盐（镍铁矿）-铜酸盐-锰铁矿的LaSrCoCuMnO 6和LaSrNiCuMnO 6的热力学特性

摘要

纳米级（纳米簇）钴酸盐（nickelite）的比热的温度依赖性-cuprate-锰LaSrCoCuMnO ₆和LaSrNiCuMnO ₆已经在298.15-673 K.比热的温度依赖性的范围通过实验动态量热法研究了\（ {C} _ {p} ^ {\ CIRC} \）  〜  ˚F（Ť LaSrCoCuMnO的）₆（在323和523 K）和LaSrNiCuMnO ₆（在348 K）显示出异常的跳跃的比热，这可能是由于二阶相变 基于\（{C} _ {p} ^ {\ circ} \）（T）上的实验数据和熵S的计算值°（298.15），在298.15–673 K的温度范围内计算出所研究化合物的比热和热力学函数的温度依赖性。