New cesium titanate layer structures |
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| Authors: | I.E. Grey I.C. Madsen J.A. Watts L.A. Bursill J. Kwiatkowska |
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| Affiliation: | CSIRO Division of Mineral Chemistry, P.O. Box 124, Port Melbourne, Victoria, Australia 3207;School of Physics, University of Melbourne, Parkville, Victoria, Australia 3052 |
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| Abstract: | A phase study of the Cs2OTiO2 system in the composition range 75–100 mole% TiO2 and the temperature range 850–1200°C revealed the existence of two new cesium titanates, with compositions Cs2Ti5O11 and Cs2Ti6O13. The former compound undergoes a reversible hydration reaction below 200°C to form Cs2Ti5O11 · (1 + x)H2O, 0.5 < x < 1. The structures of the three phases have been determined. They are based on corrugated layers of edge-shared octahedra, with cesium ions (and H2O) packing between the layers. In Cs2Ti6O13, the layers are continuous in two dimensions, whereas in Cs2Ti5O11 and Cs2Ti5O11 · (1 + x)H2O, the layers are periodically stepped to give 5-octahedra wide, corner-linked ribbons. |
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