A high temperature Raman study of Eu(1-x) K(x) TiO₃ prepared under high pressure and high temperature

A Raman study was carried out on the phase transition and decomposition of perovskite-type cubic phase Eu(1-x) K(x)TiO₃ (x = 0.20, 0.26, 0.32, 0.38 and 0.44), which were synthesized under high pressure and high temperature. Upon sintering, the metastable cubic phase transforms to the tetragonal phase. In the decomposition process, K₂Ti₆O₁₃ was identified as one of the decomposition products in all samples, and no potassium titanates in other forms have been observed. In the further decomposition of K₂Ti₆O₁₃, either rutile or anatase could he obtained, depending on the heating process. Copyright (C) 2000 John Wiley and Sons, Ltd.