Abstract

The presence of fluorine impurity in alkali metal niobate ceramics sharply deteriorates both mechanical and electrical properties of these ferroelectric materials. This effect is related to the separation of a glassy phase and the formation of an inhomogeneous microstructure, these factors giving rise to local stresses in the structural elements. It is concluded that intact niobate ferroelectric articles can be made of technical-grade Nb2O5 only provided that the initial material contains a minimum amount of fluorine impurity (below 0.2 wt%).

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