Abstract
Temperature dependence of the optic phonons in 0.4PbMg 1/3Nb 2/3O 3–0.3PbSc 1/2Nb 1/2O 3–0.3PbZn 1/3Nb 2/3O 3 (0.4PMN–0.3PSN–0.3PZN) ceramics were studied by means of FTIR reflection and THz transmission spectroscopy in the temperature range of −253.15 to 226.85 °C. On heating from low temperatures, the A 1 component of the strongly split TO 1 mode softens towards the Burns temperature, but the softening ceases near 126.85 °C which could be a signature of polar cluster percolation temperature. Surprisingly, the TO 2 mode also softens on heating and follows the Cochran law with extrapolated critical temperature close to the melting point.
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