Abstract
The polymorphism of 14 rare-earth disilicate compounds, in the temperature range 900 °–1800 °C, is described by means of single-crystal and powder X-ray data. The thermal stability areas of the 7 observed structure types at normal pressure, and the transition characteristics of the polymorphs are discussed in terms of structural aspects. A description of the rare-earth-oxygen coordination polyhedra and of the [Si 2O 7] 6− configurations are given approximately by isostructural relations to other disilicate or diphosphate compounds. Complete crystal data and cell dimensions for 30 polymorphic forms, and d-spacings of one representative of each structure type, are provided.
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