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Sodium gadolinium tungstate NaGd(WO4)2: Growth, crystallography, and some physical properties |
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AbstractPure, and Nd3+-doped NaGd(WO4)2 (NGW) single crystals, up to ~85 mm long and ~30 mm in diameter, have been grown using the Czochralski method. The Nd3+ segregation coefficient for growth along the [1 0 0] direction was 1.3+/-0.025. X-ray diffraction at room temperature established the lattice constants as: a=5.2483(2) A and c=11.392(2) A, for the tetragonal scheelite-like structure (space group I41/a), with two formula units in the unit cell. Inter-atomic distances and bond angles are also given. The thermal expansion coefficients were [alpha]a=11.6x10-6 /[degree sign]C and [alpha]c=23.3x10-6 /[degree sign]C, in the a and c directions, respectively. The Nd3+ absorption spectrum at around 800 nm for E[perpendicular]c polarization was measured with high resolution, providing a peak absorption cross-section of 2.6x10-20 cm2 at 800.8 nm.
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