โ Scribed by L.A. Klinkova; V.I. Nikolaichik; N.V. Barkovskii; V.K. Fedotov
No coin nor oath required. For personal study only.
Thermal stability of the perovskite BaBiO 3 and phase relations in the BaO+BiO 1.5 (BiO 2.5 ) system in the range of 45+55 mol%. BiO 1.5 at p(O 2 ) โซุโฌ 0.21 atm have been studied by thermogravimetric analysis, di4erential thermal analysis, X-ray di4raction, chemical analysis, and transmission electron microscopy. It has been found that BaBiO 3 loses oxygen in the temperature range between 600 and 10153C with formation of the oxygen-de5cient phases BaBiO 2.88 , BaBiO 2.83 , BaBiO 2.75 , and BaBiO 2.55 . BaBiO 3 and the oxygen-de5cient phases form twophase regions involving phases of the perovskite series Ba m Bi m ุ n O y at the Bi-rich side and Ba m ุ n Bi m O y at the Ba-rich side. At 10153C the BaBiO 2.55 phase exhibits incongruent melting. At further increasing temperature the 1 : 1 (Ba : Bi) sample passes through a sequence of the crystallization 5elds of the Ba-rich phases of the compositions 5 : 4, 4 : 3, 3 :2, 9 : 5, and 17 : 9, reaching the complete melting state at 11003C.
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