Abstract
Transparent, colorless 30 mm long, (705±11) μm diameter CaTa2O6 single crystal fibers with a cubic crystalline structure (Pm3) were grown by the Laser Heated Pedestal Growth technique. The lattice parameter was a=(7.757±0.002) Å obtained from the Rietveld refinement. The fiber growth direction was determined as [101̄] by X-ray diffraction. The growth temperature was (2040±100)°C and the axial temperature gradient measured at the crystallization interface was (7.5±1.0)×103 °C/cm. The fiber/pedestal-pulling ratio was equal to 1.20. Undoped samples were characterized by optical microscopy, X-ray diffraction patterns, infrared transmission and Raman scattering. The structural and spectroscopic results indicate that this crystal may have potential as a host for active ions such as neodymium and erbium which have interesting emissions in the near-infrared region.
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