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On the High‐temperature Crystal Structure of Sr/Mg‐doped Lanthanum Gallate. Evidence for the First Perovskite‐type Structure with R3¯m Symmetry
Author(s) -
Boysen Hans,
Lerch Martin,
Lehnert Harald,
Ehrenberg Helmut
Publication year - 2002
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/1521-3749(200212)628:12<2647::aid-zaac2647>3.0.co;2-z
Subject(s) - lanthanum , perovskite (structure) , crystallography , crystal structure , doping , gallate , superstructure , materials science , neutron diffraction , chemistry , physics , inorganic chemistry , nuclear chemistry , thermodynamics , optoelectronics
The high temperature structure above 700 °C of the oxygen superionic conductor La 0.9 Sr 0.1 Ga 0.8 Mg 0.2 O 2.85 has been analyzed by means of a combined neutron and high resolution synchrotron powder study. The splitting of reflections and the absence of any superstructure reflections leads to the conclusion that the correct space group is R3¯m. This is the first example of this space group appearing within the subgroup family of the ideal parent perovskite structure with Pm3¯m symmetry.