Thermal conductivity of ferroelectric nanoregions and the exploration of morphotropic phase boundary through high-pressure synthesis

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Although relaxor ferroelectrics are known for their exceptional piezoelectric properties, the nanoscale phase separation phenomena found in these materials are not well understood. The specific heat and thermal conductivity measurements on the typical relaxor ferroelectrics (1-x)Pb(Mg_<1/3>Nb_<2/3>)O_3-xPbTiO_3 and (1-x)Pb(Zn_<1/3>Nb_<2/3>)O_3-xPbTiO_3 showed that the thermal properties change from glasslike to crystal-like as the size of ferroelectric regions grow from nanoscale to macroscale.