Thermodynamic Characteristics of Bismuth, Gadolinium, Neodymium, and Cobalt Oxide Compounds

The standard enthalpies of formation of compounds Bi 1.2 Gd 0.8 O 3 and Bi 12.5 Nd 1.5 CoO 22.3 were determined by solution calorimetry: Δ f H 0 (Bi 1.2 Gd 0.8 O 3 , s, 298.15 K) = –849.7 ± 4.9 kJ/mol, and Δ f H 0 (Bi 12.5 Nd 1.5 CoO 22.3 , s, 298.15 K) = –5115.5 ± 15.4 kJ/mol. The lattice enthalpie...

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Bibliographic Details
Published in:Russian journal of inorganic chemistry 2022-11, Vol.67 (11), p.1813-1817
Main Authors: Matskevich, N. I., Semerikova, A. N., Samoshkin, D. A., Stankus, S. V., Zaitsev, V. P., Fedorov, A. A.
Format: Article
Language:English
Subjects:
Bismuth
Chemistry
Chemistry and Materials Science
Cobalt oxides
Enthalpy
Gadolinium
Heat measurement
Inorganic Chemistry
Neodymium
Phase transitions
Physical Methods of Investigation
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Summary:The standard enthalpies of formation of compounds Bi 1.2 Gd 0.8 O 3 and Bi 12.5 Nd 1.5 CoO 22.3 were determined by solution calorimetry: Δ f H 0 (Bi 1.2 Gd 0.8 O 3 , s, 298.15 K) = –849.7 ± 4.9 kJ/mol, and Δ f H 0 (Bi 12.5 Nd 1.5 CoO 22.3 , s, 298.15 K) = –5115.5 ± 15.4 kJ/mol. The lattice enthalpies of those compounds were calculated using the Born–Haber cycle. The Bi 12.5 Nd 1.5 CoO 22.3 heat capacity was measured by differential scanning calorimetry (DSC) in the temperature range 350−1000 K. This compound was shown to experience two phase transitions at temperatures above 720 K. Accordingly, it has a potential for use in the range 350–720 K.
ISSN:0036-0236
1531-8613
DOI:10.1134/S0036023622600988