Structural transitions in bkb and brb

Shu Ichi Nakamura; Yasumasa Koyama; Manabu Ishimaru

doi:10.1080/01411599308207786

Structural transitions in bkb and brb

Shu Ichi Nakamura, Yasumasa Koyama, Manabu Ishimaru

School of Fundamental Science and Engineering

Research output: Contribution to journal › Article › peer-review

Abstract

Features of the crystal structures at room temperature and structural transitions in both Ba_1-xK_xBiO₃ and Ba_1-xRb_xBiO₃ with 0.1 < ϗ ≤ 0.5 have been examined in detail by means of electron diffraction. From the analysis of diffraction patterns, it has been confirmed that at room temperature the crystal system changes with respect to ϗ cubic system for ϗ ≥ 0.35 and orthorhombic for 0.1 < ϗ < 0.35. Furthermore, the cubic to orthorhombic structural transition with changing temperature was found to be due to the condensation of the R_x ₂₅ and the R_Y 25 modes.

Original language	English
Pages (from-to)	243-247
Number of pages	5
Journal	Phase Transitions
Volume	41
Issue number	1-4
DOIs	https://doi.org/10.1080/01411599308207786
Publication status	Published - 1993 Jan 1

Keywords

Ba-superconducting oxides
crystal structure
electron diffraction
structural transition

ASJC Scopus subject areas

Instrumentation
Materials Science(all)

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AU - Nakamura, Shu Ichi

AU - Koyama, Yasumasa

AU - Ishimaru, Manabu

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N2 - Features of the crystal structures at room temperature and structural transitions in both Ba1-xKxBiO3 and Ba1-xRbxBiO3 with 0.1 < ϗ ≤ 0.5 have been examined in detail by means of electron diffraction. From the analysis of diffraction patterns, it has been confirmed that at room temperature the crystal system changes with respect to ϗ cubic system for ϗ ≥ 0.35 and orthorhombic for 0.1 < ϗ < 0.35. Furthermore, the cubic to orthorhombic structural transition with changing temperature was found to be due to the condensation of the Rx 25 and the RY 25 modes.

AB - Features of the crystal structures at room temperature and structural transitions in both Ba1-xKxBiO3 and Ba1-xRbxBiO3 with 0.1 < ϗ ≤ 0.5 have been examined in detail by means of electron diffraction. From the analysis of diffraction patterns, it has been confirmed that at room temperature the crystal system changes with respect to ϗ cubic system for ϗ ≥ 0.35 and orthorhombic for 0.1 < ϗ < 0.35. Furthermore, the cubic to orthorhombic structural transition with changing temperature was found to be due to the condensation of the Rx 25 and the RY 25 modes.

KW - Ba-superconducting oxides

KW - crystal structure

KW - electron diffraction

KW - structural transition

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Structural transitions in bkb and brb

Abstract

Keywords

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