LaMgAl_(11)O_(19)∶Nd^(3+)晶体组分和晶体生长

Composition and Growth of the Crystal LaMgAl_(11)O_(19):Nd^(3+)

用电子探针分析 LaMgAl_(11)O_(19):Nd^(3+)晶体和夹杂物中的成分,结果表明,夹杂物由主成分不同组成所构成,晶体成分整体偏离化学比。进一步用 X 射线荧光技术分析 Al_2O_3过量所生长的晶体成分,得到了生长优质晶体的组分。设计特殊温场,用提拉法生长出φ25×120mm、无解理α方向的 LaMgAl_(11)O_(19):Nd^(3+)大单晶。

The electron probe analysis data of the crystal LaMgAl_(11)O_(19):Nd^(3+) and its inclusions show that the inclusions are formed by various compo-sitions of main constituents and the crystal composition doesn′t agree withthe stoichiometric one.Further X-ray fluorescence analysis of the crystalgrown from the charge with alumina excess of 3.1% results in a congruentmelting composition.With the growth system optimized,single crystal up to 25mm in diameter and 120 mm length has been grown by the Czochralski techni-que along the a axis.