Substitution of Ba for Ca in the Structure of CaAl₁₂O₁₉

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• 作者：Junhong Chen ; Haiyang Chen ; Wenjun Mi ; Zheng Cao ; Bin Li and Chaojing Liang
• 刊名：Journal of the American Ceramic Society
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：100
• 期：1
• 页码：413-418
• 全文大小：1691K
• ISSN：1551-2916

文摘

The effect of Ba²⁺ on the crystallization thickness of calcium hexaaluminate (CA₆) along the c axis was studied. The results show that after introduction of Ba²⁺, the CA₆ flake crystals fired at 1600°C become thicker obviously. The structure refinement shows that the structure formula of the doped CA₆ is (Ca_0.973Ba_0.027)O·6Al₂O₃, indicating Ba²⁺ has entered the lattices of CA₆ and substituted Ca²⁺ in the mirror layers. The introduction of Ba²⁺ results in more defects V_Al in spinel block layers in CA₆, making ions easier to diffuse along c axis and fastening the growing of CA₆ crystals along c axis. Thus, the introduction of Ba²⁺ is feasible and advantageous to increase the crystallization thickness of CA₆ along c axis.