Abstract
Transparent and pale yellow calcium barium niobates (CaxBa1−xNb2O6) single crystals with larger Ca content ranging from 0.224 to 0.366 have been grown out by floating zone technique. The growth of CBN crystals in air is oriented along the 〈001〉 direction. The CBN crystals have been characterized by X-ray diffraction and X-ray single crystal diffraction. The composition uniformity of CBN-35 crystal rod has been checked by EPMA measurement. The deviations of Ca mole fraction between initial melt and the crystal are 0.1–1.4mol%, which is much lower than crystals prepared by the Czochralski method. All the as grown crystals had high transmittance above 80% with increasing wavelength from about 500nm. With increasing Ca content in crystal, symmetric bending mode v5 and symmetric stretching mode v2 broadened and moved to the low wave number. The relative intensity of Raman peak v5 compared to v2 increasing gradually indicates that the NbO6 octahedral distortion degree increased.
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