Низкотемпературная теплоемкость монокристалла вольфрамата цинка

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Получена теплоемкость вольфрамата цинка методом релаксационной калориметрии в интервале ~2.6–40 K. Выполнена экстраполяция теплоемкости к нулю температур и определена характеристическая температура Дебая при нуле. Сделана оценка представленных в литературе экспериментальных данных по теплоемкости. Получены уточненные значения термодинамических функций в интервале 0–301 K.

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作者简介

А. Мусихин

Институт неорганической химии им. А. В. Николаева СО РАН

编辑信件的主要联系方式.
Email: musikhin@niic.nsc.ru
俄罗斯联邦, Новосибирск, 630090

Е. Миллер

Институт неорганической химии им. А. В. Николаева СО РАН

Email: musikhin@niic.nsc.ru
俄罗斯联邦, Новосибирск, 630090

Н. Гельфонд

Институт неорганической химии им. А. В. Николаева СО РАН

Email: musikhin@niic.nsc.ru
俄罗斯联邦, Новосибирск, 630090

В. Шлегель

Институт неорганической химии им. А. В. Николаева СО РАН

Email: musikhin@niic.nsc.ru
俄罗斯联邦, Новосибирск, 630090

参考

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  6. Филипенко O.C., Победимская E.A., Белов H.B. и др. Кристаллическая структура цинкового вольфрамата ZnWO4 // Кристаллография. 1968. Т. 13. С. 163. (Filipenko O.S., Pobedimskaya E.A., Belov N.V. et al. Crystal structure of ZnWO4 // Soviet Physics – Crystallography. 1968. V. 13. P. 127–129.)
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2. Fig. 1. Experimental data on the heat capacity of ZnWO4: circles are the data of this work; asterisks are the data [11]; a solid curve is a smoothed description of the experimental data.

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3. Fig. 2. Heat capacity of ZnWO4 in Y(X) coordinates: triangles are experimental values; a straight line is a description of experimental points by the equation Y(X) = 0.0136·X, the area of validity of which lies in the range 0-14 K.

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4. Fig. 3. Relative deviation of experimental values from the smoothed heat capacity (zero ordinate) for ZnWO4: triangles are described by equation (1) in the range 2.6–14 K; circles and diamonds are described by equation (3) of the data of this work in the range 2.6–40 K and data [12] at 81-301 K, respectively, The advantages are a smoothed description of the experimental heat capacity by a polynomial based on the data [12]. Experimental point #3 at 3.21 K is statistically significantly deviated (triangle and circle, 4.2%), it was excluded from consideration when finding a smoothed description.

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5. 4. Thermodynamic functions of ZnWO4 in the range 0-301 K: heat capacity Cp(T) (1), entropy Sp(T)(2) and enthalpy ∆H(T) (3).

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6. 5. Gibbs free energy ∆G(T) for ZnWO4 in the range 0-301 K.

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