High temperature transmission electron microscopy and X-ray diffraction studies of twinning and the phase transition at 145°C in LaGaO3

Y. Wang; X. Liu; G. D. Yao; R. C. Liebermann; M. Dudley

doi:10.1016/0921-5093(91)90356-R

High temperature transmission electron microscopy and X-ray diffraction studies of twinning and the phase transition at 145°C in LaGaO₃

Y. Wang
, X. Liu
, G. D. Yao
, R. C. Liebermann
, M. Dudley

Materials Science and Engineering

Stony Brook University

Stony Brook University

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

50 Scopus citations

Abstract

The first-order structural phase transition in LaGaO₃ at T_c = 145°C has been examined by transmission electron microscopy (TEM) and X-ray powder diffraction. Both the low temperature (orthorhombic, Pbnm) and high temperature (rhombohedral, R3c) structures have been refined using the Rietveld full-pattern method. TEM reveals numerous twins in both phases. Two types of twin are observed in the low temperature orthorhombic phase which are characterized by reflections across the {112}_orth and {110}_orth planes. In the rhombohedral phase above T_c, (110)_rhomb reflection twins are observed with their mirror planes nearly parallel to the (001)_orth plane. The crystallographic relations between the two phases are examined in situ using TEM. Our observations are in general consistent with the white-beam synchrotron X-ray topography studies reported in a companion paper.

Original language	English
Pages (from-to)	13-21
Number of pages	9
Journal	Materials Science and Engineering: A
Volume	132
Issue number	C
DOIs	https://doi.org/10.1016/0921-5093(91)90356-R
State	Published - Feb 1991

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title = "High temperature transmission electron microscopy and X-ray diffraction studies of twinning and the phase transition at 145°C in LaGaO3",

abstract = "The first-order structural phase transition in LaGaO3 at Tc = 145°C has been examined by transmission electron microscopy (TEM) and X-ray powder diffraction. Both the low temperature (orthorhombic, Pbnm) and high temperature (rhombohedral, R3c) structures have been refined using the Rietveld full-pattern method. TEM reveals numerous twins in both phases. Two types of twin are observed in the low temperature orthorhombic phase which are characterized by reflections across the \{112\}orth and \{110\}orth planes. In the rhombohedral phase above Tc, (110)rhomb reflection twins are observed with their mirror planes nearly parallel to the (001)orth plane. The crystallographic relations between the two phases are examined in situ using TEM. Our observations are in general consistent with the white-beam synchrotron X-ray topography studies reported in a companion paper.",

author = "Y. Wang and X. Liu and Yao, \{G. D.\} and Liebermann, \{R. C.\} and M. Dudley",

year = "1991",

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doi = "10.1016/0921-5093(91)90356-R",

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T1 - High temperature transmission electron microscopy and X-ray diffraction studies of twinning and the phase transition at 145°C in LaGaO3

AU - Wang, Y.

AU - Liu, X.

AU - Yao, G. D.

AU - Liebermann, R. C.

AU - Dudley, M.

PY - 1991/2

Y1 - 1991/2

N2 - The first-order structural phase transition in LaGaO3 at Tc = 145°C has been examined by transmission electron microscopy (TEM) and X-ray powder diffraction. Both the low temperature (orthorhombic, Pbnm) and high temperature (rhombohedral, R3c) structures have been refined using the Rietveld full-pattern method. TEM reveals numerous twins in both phases. Two types of twin are observed in the low temperature orthorhombic phase which are characterized by reflections across the {112}orth and {110}orth planes. In the rhombohedral phase above Tc, (110)rhomb reflection twins are observed with their mirror planes nearly parallel to the (001)orth plane. The crystallographic relations between the two phases are examined in situ using TEM. Our observations are in general consistent with the white-beam synchrotron X-ray topography studies reported in a companion paper.

AB - The first-order structural phase transition in LaGaO3 at Tc = 145°C has been examined by transmission electron microscopy (TEM) and X-ray powder diffraction. Both the low temperature (orthorhombic, Pbnm) and high temperature (rhombohedral, R3c) structures have been refined using the Rietveld full-pattern method. TEM reveals numerous twins in both phases. Two types of twin are observed in the low temperature orthorhombic phase which are characterized by reflections across the {112}orth and {110}orth planes. In the rhombohedral phase above Tc, (110)rhomb reflection twins are observed with their mirror planes nearly parallel to the (001)orth plane. The crystallographic relations between the two phases are examined in situ using TEM. Our observations are in general consistent with the white-beam synchrotron X-ray topography studies reported in a companion paper.

UR - https://www.scopus.com/pages/publications/0026103633

U2 - 10.1016/0921-5093(91)90356-R

DO - 10.1016/0921-5093(91)90356-R

M3 - Article

SN - 0921-5093

VL - 132

SP - 13

EP - 21

JO - Materials Science and Engineering: A

JF - Materials Science and Engineering: A

IS - C

ER -

High temperature transmission electron microscopy and X-ray diffraction studies of twinning and the phase transition at 145°C in LaGaO₃

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