A high temperature Raman study of Eu1-xKxTiO3 prepared under high pressureand high temperature

A Raman study was carried out on the phase transition and decomposition of perovskite-type cubic phase Eu1-xKxTiO3 (x = 0.20, 0.26, 0.32, 0.38 and 0.4 4), which were synthesized under high pressure and high temperature. Upon s intering, the metastable cubic phase transforms to the tetragonal phase. In the decomposition process, K2Ti6O13 was identified as one of the decomposi tion products in all samples, and no potassium titanates in other forms hav e been observed. In the further decomposition of K2Ti6O13, either rutile or anatase could be obtained, depending on the heating process. Copyright (C) 2000 John Whey & Sons, Ltd.