Phase transformations in Er2Si207 ceramics

摘要

Rare-earth compounds are of technological and research interest due to their magnetic, electrical and optical properties. The structures and phase transitions of the rare-earth disilicates prepared by sintering the oxide components have been extensively investigated [1-3]. A study of single crystal growth of R2Si2O7 (R = Tm, Er, Ho, Dy) by Maqsood et al. [4] shows various polymorphic forms of these disilicates. Ito and Johnson [5] as well as Warshaw and Roy [6] used the Greek letters a, ft and y to distinguish the polymorphic forms of the rare-earth disilicates. Felsche [7] and Maqsood and co-workers [3, 4] followed the nomenclature of the polymorphs of the rare-earth sesquioxides, designating the various structural types by the capital letters A, B, C, D, E, F, G, the method also followed here.