Various representative positions of the crystal boule were examined using X-ray powder diffraction (XRPD) analysis. Only in the bottom of the crystal boule there produced a kind of lithium-poor phase (LiAl_5O_8).

• 对该晶体毛坯的各个有代表性的位置作了X射线粉末衍射(XRPD)分析,结果表明仅仅在晶体毛坯的底部生成了一种缺锂相(LiAl5O8 )。