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Twinning of LaGaO3single crystals

Igor K. Bdikin, I. M. Shmytko, A. M. Balbashov, A. V. Kazansky

Open publisher page 28 citations

Abstract

LaGaO3 single crystals, grown by the method of zone melting without a crucible, with radiation heating, were investigated by X-ray topography and diffractometry. It has been found that at 293 K these crystals have an orthorhombic unit cell with a = 5.520 (2), b = 5.490 (2), c = 7.770 (1) Å and twinning in the {110}/ 〈1{\bar 1}0〉 and {112}/〈1{\bar 1}0〉 systems simultaneously. Regions of cross-twinning have been discovered in these systems. A first-order phase transition from orthorhombic to rhombohedral has been observed at 412.5 K, the cell parameters being a = 3.889 Å, α = 89.50° (423 K). The rhombohedral phase has a developed twin structure in the {100}/〈001〉 and {110}/〈001〉 systems. During transformation the structure undergoes an inherited change to the twin structure of the orthorhombic phase.

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What this paper is about

LaGaO3 single crystals, grown by the method of zone melting without a crucible, with radiation heating, were investigated by X-ray topography and diffractometry. It has been found that at 293 K these crystals have an orthorhombic unit cell with a = 5.520 (2), b = 5.490 (2), c = 7.770 (1) Å and twinning in the {110}/ 〈1{\bar 1}0〉 and {112}/〈1{\bar 1}0〉 systems simultaneously. Regions of cross-twinning have been discovered in these systems. A first-order phase transition from orthorhombic to rhombohedral has been observed at 412.5 K, the cell parameters being a = 3.889 Å, α = 89.50° (423 K). The rhombohedral phase has a developed twin structure in the {100}/〈001〉 and {110}/〈001〉 systems. During transformation the structure undergoes an inherited change to the twin structure of the orthorhombic phase.

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Available abstract

LaGaO3 single crystals, grown by the method of zone melting without a crucible, with radiation heating, were investigated by X-ray topography and diffractometry. It has been found that at 293 K these crystals have an orthorhombic unit cell with a = 5.520 (2), b = 5.490 (2), c = 7.770 (1) Å and twinning in the {110}/ 〈1{\bar 1}0〉 and {112}/〈1{\bar 1}0〉 systems simultaneously. Regions of cross-twinning have been discovered in these systems. A first-order phase transition from orthorhombic to rhombohedral has been observed at 412.5 K, the cell parameters being a = 3.889 Å, α = 89.50° (423 K). The rhombohedral phase has a developed twin structure in the {100}/〈001〉 and {110}/〈001〉 systems. During transformation the structure undergoes an inherited change to the twin structure of the orthorhombic phase.

Key concepts: Crystal twinning, Orthorhombic crystal system, Crystallography, Macle, Trigonal crystal system, Materials science, Phase (matter), Crucible (geodemography)

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