Synthesis and thermodynamic stability of new phase BaCe0.6Y0.3In0.1O2.8

Abstract

• We synthesized new phase BaCe 0.6 Y 0.3 In 0.1 O 2.8 . • We measured formation enthalpy of BaCe 0.6 Y 0.3 In 0.1 O 2.8 . • The phase is thermodynamically stable with respect to decomposition into binary oxides at room temperature. • BaCe 0.6 Y 0.3 In 0.1 O 2.8 is more thermodynamically favored than BaCe 0.9 In 0.1 O 2.95 . The preparation of BaCeO 3 doped by yttrium and indium oxides (BaCe 0.6 Y 0.3 In 0.1 O 2.8 ) has been performed by solid-state reaction from BaCO 3 , CeO 2 , Y 2 O 3 , and In 2 O 3 . The compound BaCe 0.6 Y 0.3 In 0.1 O 2.8 has been synthesized for the first time. The X-ray measurements have shown that BaCe 0.6 Y 0.3 In 0.1 O 2.8 has an orthorhombic structure (space group Pmcn ). The standard molar enthalpy of formation of BaCe 0.6 Y 0.3 In 0.1 O 2.8 has been determined by solution calorimetry combining standard molar enthalpies of dissolution of BaCe 0.6 Y 0.3 In 0.1 O 2.8 and BaCl 2 + 0.6CeCl 3 + 0.3YCl 3 + 0.1InCl 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 0.6 Y 0.3 In 0.1 O 2.8 was more thermodynamically favored than BaCe 0.9 In 0.1 O 2.95 .