Open AccessHeat capacity and thermal expansion of yttrium tantalate
Author(s) -
А. Хорошилов,
А. А. Ашмарин,
V. N. Guskov,
E. G. Sazonov,
К. С. Гавричев,
В. М. Новоторцев
Publication year - 2019
Publication title -
doklady akademii nauk. rossijskaâ akademiâ nauk
Language(s) - English
Resource type - Journals
ISSN - 0869-5652
DOI - 10.31857/s0869-56524842181-183
Subject(s) - heat capacity , yttrium , differential scanning calorimetry , adiabatic process , monoclinic crystal system , thermodynamics , materials science , specific heat , atmospheric temperature range , chemistry , crystal structure , crystallography , physics , metallurgy , oxide
The isobaric heat capacities of two monoclinic (M' and M) modifications of yttrium orthotantalate at temperatures 5–1300 K have been measured by the adiabatic and differential scanning calorimetry methods. It has been demonstrated that the difference in structure between the crystal lattices of M' and M has small effect in the heat capacity, and the difference between the heat capacities of these phases Cp(M)-Cp(M') is small, always positive, and increases in the range of the lowest temperatures. The unit cell parameters of M-YTaO4 have been determined as a function of temperature in the range 300–1173 K.