THERMODYNAMIC PROPERTIES OF ITTRIUM-MAGNESIUM BISMUTHITE
Keywords:
yttrium-magnesium bismuthite, calorimetry, heat capacity, second-order phase transition, thermodynamic functionsAbstract
The possibility of obtaining bismuthite of yttrium with an s-element in a solid-phase method from yttrium (III) oxides, bismuth (III) and magnesium carbonate is shown. Using X-ray diffraction analysis determined that yttrium-magnesium bismuthite crystallizes in cubic syngony, and also the parameters of primitive cell, X-ray and pycnometric densities. To investigate the isobaric heat capacity of the compound used dynamic calorimetry in the interval from 298.15 to 673 K. The λ-shaped jump at 473 K on the curve of the temperature dependence of the heat capacity of the compound indicates a second-order phase transition due to valuable electrophysical properties.
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