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Heat Capacity of Pb 10 – x Pr x (GeO 4 ) 2 + x (VO 4 ) 4 – x ( x = 0, 1, 2, 3) Apatites in the Range 350–1050 K
Inorganic Materials ( IF 0.9 ) Pub Date : 2020-10-14 , DOI: 10.1134/s0020168520100039
L. T. Denisova , Yu. F. Kargin , E. O. Golubeva , G. M. Zeer , A. K. Abkaryan , V. M. Denisov

Abstract

Pb10 – xPrx(GeO4)2 + x(VO4)4 – x (x = 0, 1, 2, 3) apatites have been prepared by solid-state reactions via sequential firing of appropriate oxide mixtures (PbO, Pr2O3, GeO2, and V2O5) in air in the temperature range 773–1073 K. Their unit-cell parameters have been determined as functions of temperature by high-temperature X-ray diffraction measurements, and the linear and volume expansion coefficients of Pb7Pr3(GeO4)5(VO4) have been calculated. The heat capacity of the synthesized Pb10 – xPrx(GeO4)2 + x(VO4)4 – x (x = 0, 1, 2, 3) compounds with the apatite structure has been determined by differential scanning calorimetry in the temperature range 350–1050 K. The cp(T) curves of the samples with x = 1, 2, and 3 have been shown to have extrema (in particular, peaks at 701, 917, and 1018 K for the x = 3 sample) due to phase transitions. The experimental Cp(T) heat capacity data have been used to evaluate the thermodynamic functions of the synthesized apatites.



中文翻译:

Pb 10 – x Pr x(GeO 4)2 + x(VO 4)4 – x(x = 0、1、2、3)磷灰石的热容在350–1050 K范围内

摘要

10 - XX(GEO 42 + X(VO 44 - XX = 0,1,2,3)磷灰石已制备通过经由适当的氧化物的混合物顺序点火(固态反应的PbO, Pr 2 O 3,GeO 2和V 2 O 5)在773–1073 K的温度范围内的空气中。通过高温X射线衍射测量确定了它们的晶胞参数与温度的函数关系,并且线性和Pb 7 Pr 3(GeO 4)的体积膨胀系数已经计算出5(VO 4)。通过差示扫描量热法测定了合成的磷灰石结构的Pb 10- x Pr x(GeO 42 + x(VO 44 -xx = 0、1、2、3)化合物的热容。的温度范围内350-1050 K的ç pŤ)与所述样品的曲线X = 1,2,和3中已经示出为具有极值(特别地,峰在701,917,和1018 K为X = 3个样本)。实验C pT)热容量数据已用于评估合成磷灰石的热力学功能。

更新日期:2020-10-15
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