Enthalpy of Formation of Erbium-Doped Bismuth Niobate

• Published in: Russian journal of inorganic chemistry Vol. 65; no. 5; pp. 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: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 01.05.2020; Springer Nature B.V
• Subjects: Bismuth oxides; Chemistry; Chemistry and Materials Science; Conductors; Enthalpy; Erbium compounds; Erbium oxide; Inorganic Chemistry; Niobates; Niobium; Thermodynamics of Inorganic Compounds; substituted bismuth niobate; formation enthalpy; lattice enthalpy
• ISSN: 0036-0236; 1531-8613
• DOI: 10.1134/S0036023620050162

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.