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ll921

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xx single crystals were grown by the optical floating zone method. The as-grown samples were dark brown in color and had a size of §¶ 4-6 mm ¡Á L 87 mm£¬with the largest crystal domain of §¶ 5 mm¡Á 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 MgNb2O6 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 inclusions. Raman scattering was also used to characterize the crystals and gave the change of x-O band annealed and non-annealed. The photoluminescence spectra exhibited a broad and strong blue emission band centered at 435 nm.
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xx single crystals were grown by the optical floating zone method. The as-grown samples were dark brown in color (and had=with) a size of §¶ 4-6 mm ¡Á L 87 mm (£¬with =which is)the largest crystal domain of §¶ 5 mm¡Á L 32 mm. After being annealed, the color of the sample(s) faded to light brownish. (The powder X-ray diffraction analysis=X-ray powder diffraction analysis¼´XRD£¬ÕâµãÊÇרҵ¶«Î÷£¬µ«ÎÒÖªµÀµÄXRDÊÇÕâÑùдµÄ£¬Èç¹ûÄãµÄ±¾Éí¾ÍÊÇÄÇÑùдµÄ»°£¬¾ÍÒª°ÑÇ°ÃæµÄthe¸øÈ¥µô)  showed that the crystals had a columbite-type MgNb2O6 structure. The crystal(s) grew along the c-axis direction (and=so that) the cleavage plane could be indexed to b-axis direction. Transmission polarized-light microscopy measurements displayed that the crystal(s) (was=were) free of low angle grain boundaries and inclusions. Raman scattering was also used to characterize the crystals and gave (the=a) change of x-O band annealed and non-annealed. The photoluminescence spectra exhibited a broad and strong blue emission band centered at 435 nm.
2Â¥2011-03-09 12:03:06
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ll921(½ð±Ò+10, ·­ÒëEPI+1): 2011-03-11 08:31:52
xx single crystals were grown by(through) the optical floating zone method. The as-grown samples were dark brown in color (with) a size of §¶ 4-6 mm ¡Á L 87 mm and)the largest crystal domain of §¶ 5 mm¡Á L 32 mm. After being annealed, the color of the samples (Ö±½ÓÓÃthe samplesµØµÀµã)faded to light brownish. (The powder X-ray diffraction analysis=X-ray powder diffraction analysis¼´XRD£¬ showed that the crystals had a columbite-type MgNb2O6 structure. The crystal(s) 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(s) (were) free of low angle grain boundaries and inclusions. £¨The£©Raman scattering was also used to characterize the crystals and gave the change of x-O band annealed and non-annealed. The photoluminescence spectra exhibited a broad and strong blue emission band centered at 435 nm.
3Â¥2011-03-09 12:13:47
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