Heat capacity, entropy of Ln2(MoO4)3 (Ln = La, Sm, and Gd), and the high-temperature enthalpy of Ln2(MoO4)3 (Ln = Eu, Dy, and Ho)

被引：0
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作者：
V. M. Lazarev
Y. L. Suponitskiy
S. E. Liashenko
机构：
[1] Mendeleev University of Chemical Technology,
来源：
Russian Journal of Physical Chemistry A | 2016年 / 90卷
关键词：
low-temperature heat capacity; standard entropy; high-temperature enthalpy; adiabatic calorimetry; high-temperature microcalorimetry; rare earth elements (REEs); REE molybdates; Ln; (MoO; ); (Ln = La, Sm, Eu, Gd, Dy, and Ho);
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摘要：
The low-temperature heat capacity of Ln2(MoO4)3 (Ln = La, Sm, and Gd) is investigated by means of adiabatic calorimetry within the range of 60–300 K. The temperature dependences of the heat capacity are found and the values of the standard entropy are calculated, based on extrapolations to 0 K. Characteristic temperatures for molybdates are determined from the results of IR spectroscopic studies. The high-temperature enthalpy of Ln2(MoO4)3 (Ln = Eu, Dy, and Ho) is measured via high-temperature microcalorimetry, and the temperature dependence of heat capacity is calculated in the range of 298–1000 K. Since samarium and gadolinium molybdates are of the same structural type as terbium molybdate, we can estimate the anomaly of the heat capacity in the low-temperature region using the data for terbium molybdate and find the entropy of samarium and gadolinium molybdates.
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页码：911 / 913
页数：2
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