K Bastwöste et al 2007 J. Phys.: Condens. Matter 19 156225 doi:10.1088/0953-8984/19/15/156225
K Bastwöste, U Sander and M Imlau
Show affiliationsConical light scattering is uncovered in poly- and mono-domain, nominally pure and Eu-doped strontium barium niobate (SBN) crystals over a wide temperature regime. The appearance of two scattering cones, a scattering line and a corona is observed and can be explained comprehensively within the Ewald sphere concept. Photorefraction, scattering from domain boundaries or from growth striations can be excluded from explaining the origin of the scattering. It is shown that the temperature-persistent scattering process is related to a growth-induced seeding rod, i.e. a composition inhomogeneity primarily localized at the centre of the SBN sample. The rod is directed parallel to the c axis and yields a refractive-index inhomogeneity with spatial frequencies on the micro-scale.
78.35.+c Brillouin and Rayleigh scattering; other light scattering
77.84.Dy Niobates, titanates, tantalates, PZT ceramics, etc.
Issue 15 (16 April 2007)
Received 21 December 2006, in final form 19 February 2007
Published 27 March 2007
K Bastwöste et al 2007 J. Phys.: Condens. Matter 19 156225
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