Phase Development during Mixed–Oxide Processing of a [Na0.5K0.5NbO3]1-x -[LiTaO3]x Powder

T.A. Skidmore; T. Stevenson; T.P. Comyn; S.J. Milne

doi:10.4028/www.scientific.net/KEM.368-372.1886

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Phase Development during Mixed–Oxide Processing of a [Na_0.5K_0.5NbO₃]_1-x -[LiTaO₃]_x Powder

Abstract:

Powders of the solid solution series [Na0.5K0.5NbO3]1-x - [LiTaO3]x, with x = 0.06, are shown to transform from an orthorhombic to a tetragonal crystal system as calcination temperature is increased in the range 850 °C to 1100 °C. Addition of 3 wt% of each alkali carbonate prior to calcination allows retention of the orthorhombic phase to 1100 oC. The latter changes in phase content are attributed to a partial compensation of alkali oxide volatilisation losses. The approach of adding extra alkali carbonates lead to an increase in d33 coefficient in sintered ceramics.