Enthalpy of Formation of Erbium-Doped Bismuth Niobate

The thermodynamic characteristics of bismuth niobate doped with erbium Bi 3 Nb 0.2 Er 0.8 O 6.2 have been determined. This compound is a representative of a promising class of ionic conductors. The solution enthalpies of bismuth oxide, erbium oxide, niobium chloride, and Bi 3 Nb 0.2 Er 0.8 O 6.2 hav...

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Bibliographic Details
Published in:Russian journal of inorganic chemistry 2020-05, Vol.65 (5), p.743-746
Main Authors: Matskevich, N. I., Semerikova, A. N., Gelfond, N. V., Matskevich, M. Yu, Tkachev, E. N., Anufrieva, O. I., Martynetz, V. G.
Format: Article
Language:English
Subjects:
Bismuth oxides
Chemistry
Chemistry and Materials Science
Conductors
Enthalpy
Erbium compounds
Erbium oxide
Inorganic Chemistry
Niobates
Niobium
Thermodynamics of Inorganic Compounds
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Summary:The thermodynamic characteristics of bismuth niobate doped with erbium Bi 3 Nb 0.2 Er 0.8 O 6.2 have been determined. This compound is a representative of a promising class of ionic conductors. The solution enthalpies of bismuth oxide, erbium oxide, niobium chloride, and Bi 3 Nb 0.2 Er 0.8 O 6.2 have been measured in 4 M HCl using solution calorimetry. Based on the experimental and reported data, we have calculated the standard formation enthalpy Δ f H °(Bi 3 Nb 0.2 Er 0.8 O 6.2 , 298.15 K) = −1787.5 ± 8.9 kJ/mol and the lattice enthalpy Δ lat H °(Bi 3 Nb 0.2 Er 0.8 O 6.2 , 298.15 K) = −28 540 kJ/mol. The obtained thermodynamic characteristics can be used to develop recommendations for optimizing the synthesis of materials based on bismuth oxides.
ISSN:0036-0236
1531-8613
DOI:10.1134/S0036023620050162