Solution calorimetry investigations of new phase BaCe0.6Y0.3In0.1O2.8

TL;DR

This study reports the first synthesis and calorimetric analysis of a new phase BaCe0.6Y0.3In0.1O2.8, revealing its orthorhombic structure and thermodynamic stability compared to related compounds.

Contribution

The paper introduces the first synthesis and thermodynamic characterization of BaCe0.6Y0.3In0.1O2.8, expanding knowledge of doped barium cerates.

Findings

BaCe0.6Y0.3In0.1O2.8 has an orthorhombic structure (space group Pmcn).

The compound is thermodynamically stable at room temperature.

BaCe0.6Y0.3In0.1O2.8 is more stable than BaCe0.9In0.1O2.95.

Abstract

The preparation of BaCeO3 doped by yttrium and indium oxides (BaCe0.6Y0.3In0.1O2.8) has been performed by solid-state reaction from BaCO3, CeO2, Y2O3, In2O3. The compound BaCe0.6Y0.3In0.1O2.8 has been synthesized for the first time. The X-ray measurements have showed that BaCe0.6Y0.3In0.1O2.8 has an orthorhombic structure (space group Pmcn). The standard formation enthalpies of BaCe0.6Y0.3In0.1O2.8 have been determined by solution calorimetry combining the solution enthalpies of BaCe0.6Y0.3In0.1O2.8 and BaCl2 + 0.6CeCl3 + 0.3YCl3 + 0.1InCl3 mixtures in 1 M HCl with 0.1 M KI at 298.15 K and literature data. It has been obtained that above-mentioned mixed oxide is thermodynamically stable with respect to their decomposition into binary oxides at room temperatures. It has been also shown that BaCe0.6Y0.3In0.1O2.8 has been more thermodynamically favored than BaCe0.9In0.1O2.95.