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BaO-BiO1.5 phase diagram in the region 80–100 mol % BiO1.5 at p o 2 = 21 kPa

  • Physicochemical Analysis of Inorganic Systems
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Abstract

The phase equilibria in the region from 80 to 100 mol % BiO1.5 are studied in the BaO-BiO1.5 system in air and under an argon atmosphere using visual polythermal analysis (VPA), X-ray powder diffraction, differential thermal analysis (DTA), electron diffraction (ED), and elemental analysis in a transmission electron microscope (EA/TEM). A series of discrete layered rhombohedral phases (RPs) with the composition Ba2Bi8+n Oy, where n = 0, 1, 2, 4, 8, or 10, is discovered. The melting character is determined for these RPs: the 1: 4 phase melts congruently; the 2: 9, 1: 5, 1: 6, and 1: 8 phases melt incongruently. The crystallization fields are 10–30°C. At p o 2 = 21 kPa, the 1: 4 phase in the subsolidus region decomposes into a 4: 13 perovskite-like phase and the 2: 9 phase. The other rhombohedral phases decompose into stages to yield Bi2O3 and a neighboring RP that is richer in barium. The Ba2Bi8+n Oy oxides are stable in argon and experience a first-order phase transformation at about 560°C.

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Authors and Affiliations

  1. Institute of Solid State Physics, Russian Academy of Sciences, Chernogolovka, Moscow oblast, 142432, Russia

    L. A. Klinkova, N. V. Barkovskii & V. K. Fedotov

  2. Institute of Problems of Microelectronic Technology and High-Purity Materials, Russian Academy of Sciences, Chernogolovka, Moscow oblast, 142432, Russia

    V. I. Nikolaichik

Authors
  1. L. A. Klinkova
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  2. V. I. Nikolaichik
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  3. N. V. Barkovskii
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  4. V. K. Fedotov
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Original Russian Text © L.A. Klinkova, V.I. Nikolaichik, N.V. Barkovskii, V.K. Fedotov, 2006, published in Zhurnal Neorganicheskoi Khimii, 2006, Vol. 51, No. 7, pp. 1201–1211.

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Klinkova, L.A., Nikolaichik, V.I., Barkovskii, N.V. et al. BaO-BiO1.5 phase diagram in the region 80–100 mol % BiO1.5 at p o 2 = 21 kPa. Russ. J. Inorg. Chem. 51, 1122–1131 (2006). https://doi.org/10.1134/S0036023606070175

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  • DOI: https://doi.org/10.1134/S0036023606070175

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