Thermodynamic Properties of Bismuth–Holmium–Cobalt Oxide

Thermodynamic Properties of Bismuth–Holmium–Cobalt Oxide

DSC is used to determine the heat capacity of compound Bi 12.5 Ho 1.5 CoO 22.3 in the 180–500 K range of temperatures. It is shown there are no phase transitions in this range. Standard enthalpy of formation Bi 12.5 Ho 1.5 COO 22.3 is determined via dissolution calorimetry, based on the enthalpies o...

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Veröffentlicht in:Russian Journal of Physical Chemistry A 2022-09, Vol.96 (9), p.1856-1860
Hauptverfasser: Matskevich, N. I., Semerikova, A. N., Gelfond, N. V., Matskevich, M. Yu, Anyfrieva, O. I.
Format: Artikel
Sprache:eng
Schlagworte:
Bismuth oxides
Bismuth trioxide
Chemistry
Chemistry and Materials Science
Cobalt oxides
Dissolution
Enthalpy
Heat Capacity: Experiments and Calculations
Holmium
Hydrochloric acid
Phase transitions
Physical Chemistry
Thermodynamic properties
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Zusammenfassung:DSC is used to determine the heat capacity of compound Bi 12.5 Ho 1.5 CoO 22.3 in the 180–500 K range of temperatures. It is shown there are no phase transitions in this range. Standard enthalpy of formation Bi 12.5 Ho 1.5 COO 22.3 is determined via dissolution calorimetry, based on the enthalpies of dissolution of Bi 2 O 3 measured in 1 M hydrochloric acid, Bi 12.5 Ho 1.5 CoO 22.3 , and literature data: (Δ f H 0 (Bi 12.5 Ho 1.5 COO 22.3 ) = −5269.8 ± 18.2 kJ/mol). The lattice enthalpy is calculated using the Born–Haber cycle: Δ lat H 0 (Bi 12.5 Ho 1.5 CoO 22.3 ) = −99 080 kJ/mol.
ISSN:0036-0244
1531-863X
DOI:10.1134/S0036024422090242