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| xx single crystals were grown by the optical floating zone method. The as-grown samples had dark brown in color and had the size of Ф 4-6 mm × L 87 mm and the largest crystal domain was Ф 5 mm× L 32 mm. Having been annealed, the color of the sample faded to light brownish. The powder X-ray diffraction analyses showed that the crystals had the columbite-type xx structure. The crystal grew along the c-axis direction and the cleavage plane could be indexed to b-axis direction. Transmission polarized-light microscopy measurements displayed that the crystal was free of low angle grain boundaries and inculcations. Raman scattering was also used to characterize the crystals and gave the change of xx band after and before annealed. The photoluminescence spectra exhibit a broad and strong blue emission band centered at 435 nm. |
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ll921(金币+10, 翻译EPI+1): 非常感谢！！ 2011-02-27 08:05:11
| xx single crystals were grown with the optical floating zone method. The as-grown samples were dark brown in color and had the size of Ф 4-6 mm × L 87 mm, with the largest crystal domain being Ф 5 mm× L 32 mm. After being annealed, the color of the sample faded to light brownish. The powder X-ray diffraction analysis showed that the crystals had a columbite-type xx structure. The crystal grown along the c-axis direction and the cleavage plane could be indexed to b-axis direction. Transmission polarized-light microscopy measurements displayed that the crystals were free of low angle grain boundaries and inculcations. Raman scattering was also used to characterize the crystals and gave the change of xx band after and before annealing. The photoluminescence spectra exhibited a broad and strong blue emission band centered at 435 nm. |
2楼2011-02-26 22:52:40
