Abstract
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 (Ca0.973Ba0.027)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 VAl 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.
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