Abstract
The compound PbK 2 LiNb 5 O 15 belongs to the tetragonal tungsten bronze family (so-called TTB). Its low temperature ferroelectric-ferroelastic phase crystallises in an orthorhombic structure well described in the Pba2 space group. Above 640 K, this compound undergoes a ferroelectric-to-paraelectric phase transition, the high temperature paraelectric phase exhibiting a tetragonal symmetry (space group P4/mbm ). In this paper, a detailed structural characterisation of these two phases has been performed using a Rietveld-type method. From these studies, the position and the distribution of the Li + , K + and Pb 2+ cations within the tunnels has been determined. To complete the structural results, dielectric measurements have been performed on the series P 2 m x K 1+x Li x Nb 5 O 15 to study the effect of composition on ferroelectric properties.
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