Compositional dependence of optical and vibrational properties of strontium barium niobate (SrxBa1-xNb2O6)

Abstract

The index of refraction, the optical band edge and the Raman scattering of strontium barium niobate, SrxBa1-xNb2O 6 with 0.38 < x < 0.77 have been studied. The ordinary refractive index does not depend on x, while the extra-ordinary one increases with increasing x. The band edge is almost unaffected by the Ba-or Sr-content and shows a weak band bowing. Both the index of refraction and the band edge may be used for an optical determination of the composition of the crystal. Raman spectra show the typical behavior of tungsten bronze type crystals with broad bands and complicated spectral shapes. © 2007 WILEY-VCH Verlag GmbH & Co. KGaA.