Abstract
The thermodynamic characteristics of bismuth niobate doped with erbium Bi3Nb0.2Er0.8O6.2 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 Bi3Nb0.2Er0.8O6.2 have been measured in 4 M HCl using solution calorimetry. Based on the experimental and reported data, we have calculated the standard formation enthalpy ΔfH°(Bi3Nb0.2Er0.8O6.2, 298.15 K) = −1787.5 ± 8.9 kJ/mol and the lattice enthalpy ΔlatH°(Bi3Nb0.2Er0.8O6.2, 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.
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