Abstract
Calcium barium niobate (Ca 0.28Ba 0.72Nb 2O 6, CBN-28) crystallizes with an unfilled tungsten bronze (TB) type structure in the tetragonal system. X-ray photoelectron spectroscopy (XPS) has been performed to explore the effect of Nd-doping on the local electronic environment in the CBN-28 crystal. The content of oxygen vacancies is increased after Nd-doping. The Raman scattering spectrum has been investigated using the back scattering configuration on a CBN-28 crystal and on a crystal with Nd-doping. Comparison of the Raman data obtained for the undoped and Nd-doped CBN-28 crystals reveals slight differences in the shape and position of the Raman peaks. The difference is not readily apparent due to the low Nd 3+ content and the intrinsic disorder of the tetragonal tungsten bronze structure.
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