Synthesis and thermodynamic stability of new phase BaCe sub(0.6)Y sub(0.3)In sub(0.1)O sub(2.8)

• Published in: Thermochimica acta Vol. 579; pp. 22 - 26
• Main Authors: Matskevich, NI, Wolf, Th, Matskevich, MYu, Bryzgalova, AN, Chupakhina, TI, Vyazovkin, I V
• Format: Journal Article
• Language: Dutch
• Published: 01.03.2014
• Subjects: Calorimetry; Enthalpy; Indium oxides; Oxides; Synthesis; X-rays; Yttrium
• ISSN: 0040-6031
• DOI: 10.1016/j.tca.2014.01.007

The preparation of BaCeO sub(3) doped by yttrium and indium oxides (BaCe sub(0.6)Y sub(0.3)In sub(0.1)O sub(2.8)) has been performed by solid-state reaction from BaCO sub(3), CeO sub(2), Y sub(2)O sub(3), and In sub(2)O sub(3). The compound BaCe sub(0.6)Y sub(0.3)In sub(0.1)O sub(2.8) has been synthesized for the first time. The X-ray measurements have shown that BaCe sub(0.6)Y sub(0.3)In sub(0.1)O sub(2.8) has an orthorhombic structure (space group Pmcn). The standard molar enthalpy of formation of BaCe sub(0.6)Y sub(0.3)In sub(0.1)O sub(2.8) has been determined by solution calorimetry combining standard molar enthalpies of dissolution of BaCe sub(0.6)Y sub(0.3)In sub(0.1)O sub(2.8) and BaCl sub(2) + 0.6CeCl sub(3) + 0.3YCl sub(3) + 0.1InCl sub(3) mixtures in 1 M HCl with 0.1 M KI at 298.15 K and literature data. It has been found out that the mixed oxide mentioned above is thermodynamically stable as to its decomposition into binary oxides at room temperature. It has also been shown that BaCe sub(0.6)Y sub(0.3)In sub(0.1)O sub(2.8) was more thermodynamically favored than BaCe sub(0.9)In sub(0.1)O sub(2.95).