Coexistence of triclinic and monoclinic phases in WO3 ceramics

Abstract

The coexistence of phases in WO3 ceramics sintered within the 600–1000 °C temperature range is investigated using Raman microprobe spectroscopy. The analysis of vibrational modes indicates the existence of triclinic (VI) P1 and monoclinic (V) P21/n phases mixing. The concentration ratio between WO3 microcrystals in the former and the latter phases is shown to depend on the ceramics sintering temperature, reaching a maximum value favouring the triclinic (VI) P1 phase at the 800 °C sintering temperature. Copyright © 2000 John Wiley & Sons, Ltd.