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Common Features of Gallium Perovskites
Author(s) -
Aleksiyko R.,
Berkowski M.,
Byszewski P.,
Dabrowski B.,
Diduszko R.,
FinkFinowicki J.,
Vasylechko L. O.
Publication year - 2001
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 - 10.1002/1521-4079(200110)36:8/10<789::aid-crat789>3.0.co;2-k
Subject(s) - ionic radius , gallium , neutron diffraction , crystallography , materials science , ionic bonding , synchrotron , thermal expansion , powder diffraction , perovskite (structure) , coordination number , atmospheric temperature range , radius , diffraction , synchrotron radiation , lattice constant , crystal structure , analytical chemistry (journal) , chemistry , ion , thermodynamics , optics , metallurgy , physics , computer security , organic chemistry , computer science , chromatography
The Czochralski and floating zone methods have been used to grow single crystals of gallium perovskites solid solutions with rare earth elements La, Pr, Nd, Sm and with Sr. The structure of the crystals has been investigated by powder X‐ray, synchrotron radiation and neutron diffraction methods over a wide temperature range. The unit cell volume at room temperature varies from approximately 228 to 236 Å 3 in Sm 0.75 Nd 0.25 GaO 3 and La 0.88 Sr 0.12 GaO 3‐δ , respectively. Position of atoms in the unit cell and evolution of perovskite lattice deformation induced by continuously varying average rare earth ionic radius is discussed. The unit cell parameters including atoms positions, thermal expansion coefficients, segregation coefficients and phase transition temperature scale with the unit cell volume in all investigated crystals. All these parameters may be represented as a function of average ionic radius of rare elements, however, this value is not well determined in these compounds because of ill determined coordination number.