Growth and thermal properties of Co²⁺:LaMgAl₁₁O₁₉ crystal

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• 作者：Wenwei Ge ; Huaijin Zhang ; Jiyang Wang ; Donggang Ran ; Shangqian Sun ; Hairui Xia ; Junhai Liu ; Xiangang Xu ; Xiaobo Hu and Minhua Jiang
• 关键词：A1. High-resolution X-ray diffraction ; A1. Segregation ; A1. Solid-state reaction ; A1. X-ray diffraction ; A1. X-ray fluorescence analysis ; A2. Czochralski method ; A2. Single-crystal growth ; B1. Lanthanum magnesium hexaluminates ; B3. Solid-state lasers
• 刊名：Journal of Crystal Growth
• 出版年：2005
• 期刊代码：49_00220248
• 类别：ch
• 出版时间：2005
• 卷：282
• 期：3-4
• 页码：320-329
• 文件大小：316 K

摘要

The 0.5 and 1 at%Co²⁺-doped lanthanum magnesium hexaluminates (LaMgAl₁₁O₁₉, LMA) polycrystalline material was synthesized with high-purity (99.99%) La₂O₃, MgO, Al₂O₃ and analytical purity Co(CH₃COO)₂·4H₂O by the solid-state reaction technique. The blue Co²⁺:LMA single crystal up to Φ 40×50 mm was successfully grown by the Czochralski method. X-ray powder diffraction (XRPD) results show that the as-grown Co:LMA crystal belongs to the hexagonal system and P6₃/mmc space group. X-ray fluorescence (XRF) analysis indicates that the effective segregation coefficient of Co²⁺ ions in the Co:LMA crystal is hURL&_method=retrieve&_udi=B6TJ6-4GGWJ0D-3&_mathId=mml13&_user=10&_cdi=5302&_rdoc=9&_handle=V-WA-A-W-BE-MsSAYZA-UUA-U-AABZWZDDAY-AABBYVYCAY-CADBZUDDA-BE-U&_acct=C000050221&_version=1&_userid=10&md5=10aaf23aa8e222ae89a265fba494bd49" title="Click to view the MathML source">k_eff(Co)=0.7487. The high crystalline quality of the as-grown Co:LMA crystals was confirmed by High-resolution X-ray diffraction (HRXRD), which showed the full-width half-maximum (FWHM) of the rocking curves to be less than 20 arcsec on the (0 0 8) and (2 0 0) diffraction planes of the 0.5 at%Co:LMA crystal. The average linear thermal expansion coefficients are α₁