A New Crystal with Kalsilite-type Structure on the CaAl<SUB>2</SUB>O<SUB>4</SUB>-SiO<SUB>2</SUB> Join
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概要
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A new crystal phase with a kalsilite-type structure has been found in devitrified glass with compositions close to CaAl<SUB>2</SUB>O<SUB>4</SUB> on the CaAl<SUB>2</SUB>O<SUB>4</SUB>-SiO<SUB>2</SUB> join. The crystal can be synthesized as a nearly pure phase by heating the glass for 5 to 20 min at 1000°C. After prolonged heating, the crystal easily decomposes into an assemblage of the stable compounds, CaAl<SUB>2</SUB>O<SUB>4</SUB>, CaAl<SUB>4</SUB>O<SUB>7</SUB>, and Ca<SUB>2</SUB>Al<SUB>2</SUB>SiO<SUB>7</SUB>(gehlenite). Most of the X-ray powder diffraction lines of the kalsilite-type phase can be indexed on the basis of a hexagonal unit cell with <I>a</I>=5.0 Å and <I>c</I>=8.1 Å. In addition to these reflections, some weak ones which cannot be indexed on the basis of this unit cell are also present. The kalsilite-type phase reacts with water, resulting in heat liberation and hardening.
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