Abstract
The crystallization and stability of keatite solid solutions (ss) of base composition Li2O·Al2O3·nSiO2 with substitutions of Mg for Li and of B or Ga for Al were studied. Keatite ss with ≥40 mol% Li2O replaced by MgO and n=3.7 to 5.7 were crystallized. The stability of the phase decreased with increasing MgO and/or SiO2. An increased degree of imbalance of anion charge, created by the replacement, limited the composition range and stability of this phase. The metastable solid solutions of this composition exsolved cordierite at the higher temperatures. Stable keatite ss with 25 mol% Al2O3 replaced by B2O3 and n=3 to 5 were also crystallized. When n=3, the lattice accommodated more Li+ ions than it could without the replacement. Gallium sesquioxide could substitute exclusively for Al2O3 in a stable keatite lattice only for n>4. With n=4, ≥50 mol% Al2O3 could be replaced by Ga2O3. Glasses with high concentrations of Ga tended to crystallize, in association with predominant keatite ss, phases with Ga in 6‐fold coordination. The lattice parameters of the keatite ss did not change appreciably as a result of such substitutions.
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