Crystal structure and dielectric properties of Pb1-xSrx(Yb1/2Nb1/2)O-3 system

The crystal structure and dielectric properties of Pb1-xSrx(Yb1/2Nb1/2)O-3 (PSYN) system have been investigated by X-ray diffraction and dielectric me asurement. The Curie temperature (T-c) of the solid solution does not chang e noticeably with the Sr content. At the same time, the maximum dielectric constant value gradually decreases with the increasing Sr concentration, an d then finally the dielectric curve profile with respect to temperature bec omes nearly flat. From the X-ray intensity studies of superlattices lines, it is deduced that Sr+2 ions hinder the antiparallel displacement of Pb2+ i ons but their addition does not significantly affect the B-site ordering in Pb(Yb1/2Nb1/2)O-3. (C) 2001 Published by Elsevier Science Ltd.