Abstract

The thermodynamic characteristics of bismuth niobate doped with erbium Bi₃Nb_0.2Er_0.8O_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 Bi₃Nb_0.2Er_0.8O_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_fH°(Bi₃Nb_0.2Er_0.8O_6.2, 298.15 K) = −1787.5 ± 8.9 kJ/mol and the lattice enthalpy Δ_latH°(Bi₃Nb_0.2Er_0.8O_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.

中文翻译：

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掺铌铌酸铋的生成焓

摘要

测定了掺Bi ₃ Nb _0.2 Er _0.8 O _6.2的铌酸铋的热力学特性。该化合物是有前途的离子导体类的代表。使用溶液量热法在4 M HCl中测量了氧化铋，氧化er ，氯化铌和Bi ₃ Nb _0.2 Er _0.8 O _6.2的溶液焓。根据实验和报告数据，我们计算出标准形成焓_Δf H °（Bi ₃ Nb _0.2 Er _0.8 O _6.2，298.15 K）= -1787.5±8.9千焦/摩尔和晶格焓Δ_纬度ħ °的（Bi ₃的Nb _0.2尔_0.8 ø _6.2，298.15 K）= -28 540千焦/摩尔。所获得的热力学特性可用于提出建议，以优化基于氧化铋的材料的合成。