Abstract
The synthesis and properties of calcium, strontium, and barium aluminoborate glass‐ceramics are described in this paper. Glass powder compacts near the RO‐Al2O3‐B2O3 stoichiometry were sintered and crystallized below 1000°C to form dense glass‐ceramics containing RAI2B2O7 as the principal phase. Thermal expansion coefficients as low as 6 × 10−7/°C, 15 × 10−7/°C, and 23 × 10−7/°C were measured on SrAl2B2O7, CaAl2B2O7, and BaAl2B2O7 glass‐ceramics, respectively. Two forms of the ultra‐low‐expansion SrAl2B2O7 were not previously reported in the literature and were indexed as cubic and hexagonal crystals. The unique radial spherulitic interbladed microstructures and other important properties of these glass‐generated ceramics are also revealed.
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