Bismuth and Ytterbium Oxide Compounds: Preparation and Thermodynamics

Abstract

The compound Bi_1.3Yb_0.7O₃ was prepared by solid-phase reactions. The compound had a cubic structure, space group Fm3m, with the unit cell parameter a = 0.54202 nm. The solution enthalpy of Bi_1.3Yb_0.7O₃ as measured by solution calorimetry in 2 M HCl was Δ_solH ⁰ = −227.8 ± 6.3 kJ/mol. The measured enthalpy of solution was used to calculate the standard enthalpy of Bi_1.3Yb_0.7O₃ formation as Δ_fH ⁰ = −996.0 ± 7.9 kJ/mol. The lattice enthalpy for Bi_1.3Yb_0.7O₃ was calculated using the Born–Haber cycle as Δ_latH ⁰ = −13278 kJ/mol.