title: Structure of strontium barium niobate SrxBa1-xNb2O6 (SBN) in the composition range 0.32<or=x<or=0.82.
abstract: The structure of strontium barium niobate crystals SrxBa1-xNb2O6 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.
authors.affiliation: Fachbereich Physik, Universität Osnabrück, D-49069 Osnabrück, Germany.
authors.forename: Sergey
authors.initials: S
authors.lastname: Podlozhenov
authors.forename: Heribert A
authors.initials: HA
authors.lastname: Graetsch
authors.forename: Julius
authors.initials: J
authors.lastname: Schneider
authors.forename: Michael
authors.initials: M
authors.lastname: Ulex
authors.forename: Manfred
authors.initials: M
authors.lastname: Wöhlecke
authors.forename: Klaus
authors.initials: K
authors.lastname: Betzler