Bibliographic Details
| Title: |
Heat Capacity of Pb10 –xPrx(GeO4)2 +x(VO4)4– x (x = 0, 1, 2, 3) Apatites in the Range 350–1050 K. |
| Authors: |
Denisova, L. T., Kargin, Yu. F., Golubeva, E. O., Zeer, G. M., Abkaryan, A. K., Denisov, V. M. |
| Source: |
Inorganic Materials; Oct2020, Vol. 56 Issue 10, p1027-1032, 6p |
| Subject Terms: |
HEAT capacity, APATITE, LEAD oxides, X-ray diffraction measurement, THERMODYNAMIC functions, DIFFERENTIAL scanning calorimetry, THERMAL expansion |
| 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. [ABSTRACT FROM AUTHOR] |
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| Database: |
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