X-ray diffraction and thermodynamic characteristics for tellurite of the composition Li2CeTeO5

К. Т. Рустембеков, A. Zh. Bekturganova

2017

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DOI 10.1134/s0036024417040252
Data confidence 70 medium
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Abstract

Tellurite of the composition Li2CeTeO5 is synthesized by solid-phase method from cerium(IV) and tellurium(IV) oxides and lithium carbonate. The type of syngony, the unit cell parameters, and the compound’s X-ray and pycnometry densities are determined via X-ray diffraction analysis. The isobaric heat capacity of lithium–cerium tellurite is studied by means of dynamic calorimetry in the temperature range of 298.15–673 K; the results serve as the basis for deriving C ° ~ f(T) dependency equations and determining the compound’s thermodynamic functions. λ-shaped anomalous effects, due probably to Type II phase transitions, are found on the C ° ~ f(T) dependence.