Open AccessStructure of strontium barium niobate Sr x Ba 1 − x Nb 2 O 6 (SBN) in the composition range 0.32 ≤ x ≤ 0.82
Author(s) -
Podlozhenov Sergey,
Graetsch Heribert A.,
Ulex Michael,
Schneider Julius,
Wöhlecke Manfred,
Betzler Klaus
Publication year - 2006
Publication title -
acta crystallographica section b
Language(s) - English
Resource type - Journals
eISSN - 1600-5740
pISSN - 0108-7681
DOI - 10.1107/s0108768106038869
Subject(s) - strontium barium niobate , strontium , materials science , barium , tetragonal crystal system , atmospheric temperature range , tungsten , thermal expansion , tungstate , anisotropy , phase (matter) , x ray crystallography , diffraction , mineralogy , crystal structure , analytical chemistry (journal) , crystallography , ferroelectricity , dielectric , chemistry , optics , thermodynamics , optoelectronics , physics , organic chemistry , chromatography , metallurgy
The structure of strontium barium niobate crystals Sr x Ba 1 − x Nb 2 O 6 is comprehensively studied in the whole range of the tetragonal tungsten bronze phase ( x = 0.32–0.82) using both powder and single‐crystal X‐ray diffraction measurements. Unit‐cell parameters, density, site‐occupancy factors and interionic distances show an explicit composition dependence which can be consistently explained using simple model calculations. The temperature dependence of the unit‐cell parameters exhibits a remarkable anisotropy in a broad temperature region below the phase transition temperature. This proves that the electrostrictive contribution to the thermal expansion plays an important role in strontium barium niobate.