Broadband dielectric spectroscopy of mixed $CuInP_2(S_xSe_{1-x})_6$ crystals

Details Broadband dielectric spectroscopy of mixed $CuInP_2(S_xSe_{1-x})_6$ crystals Broadband dielectric spectroscopy of mixed $CuInP_2(S_xSe_{1-x})_6$ crystals

2008-05-08

arxiv.org/abs/0805.1109v1

Physics

Condensed Matter

Materials Science

11 pages 14 figures

Scientific paper

In this article mixed CuInP$_2$(S$_x$Se$_{1-x}$)$_6$ crystals were investigated by broadband dielectric spectroscopy (20 Hz - 3 GHz). The complete phase diagram has been obtained from these results. The phase diagram of investigated crystals is strongly asymmetric - the decreasing of ferroelectric phase transition temperatures in CuInP$_2$(S$_x$Se$_{1-x}$)$_6$ is much more flat with small admixture of sulphur then with small admixture of selenium. In the middle part of the phase diagram (x=0.4-0.9) the dipolar glass phase has been observed. In boundary region between ferroelectric order and dipolar glass disorder with small amount of sulphur (x=0.2-0.25) at low temperatures the nonergodic relaxor phase appears. The phase diagram was discussed in terms of random bonds and random fields.

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