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Twin Structure of (La, Nd)GaO 3 Solid Solutions
Author(s) -
Savytskii D.I.,
Berkowski M.,
Vasylechko L.O.,
FinkFinowicki J.,
Matkovskii A.O.
Publication year - 2000
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/(sici)1521-4079(200001)35:1<53::aid-crat53>3.0.co;2-m
Subject(s) - orthorhombic crystal system , tetragonal crystal system , solid solution , crystal twinning , perovskite (structure) , crystallography , materials science , tilt (camera) , reflection (computer programming) , phase (matter) , crystal structure , chemistry , geometry , microstructure , mathematics , computer science , programming language , metallurgy , organic chemistry
For La 1‐x Nd x GaO 3 crystals the La‐Nd substitution leads to decrease of spontaneous strains and for composition with x≈0.32 the six possible twin states of orthorhombic phase (m3mFmmm) may be degenerated in three twin states inhered in m3mF4/mmm species when a distorted perovskite pseudocell becomes tetragonal. The {110} and {112} reflection twins and axial twins with compositional planes close to (211) and (21‐1) (S‐walls) were identified in La 1‐x Nd x GaO 3 (x=0.07, 0.12, 0.20) solid solutions crystals. All observed twins are typical for crystals with GdFeO 3 type perovskite‐like structure. It has been shown that for x≤0.2 and x≥0.5 orientations of S‐walls weakly depend on La/Nd ratio, whereas in the range of 0.2