Direct Observation of the Formation of Polar Nanoregions in <?format ?>Using Neutron Pair Distribution Function Analysis
Physical review letters, 2005•APS
Using neutron pair distribution function analysis over the temperature range from 1000 to 15
K, we demonstrate the existence of local polarization and the formation of medium-range,
polar nanoregions (PNRs) with local rhombohedral order in a prototypical relaxor
ferroelectric Pb (Mg 1/3 Nb 2/3) O 3. We estimate the volume fraction of the PNRs as a
function of temperature and show that this fraction steadily increases from 0% to a maximum
of∼ 30% as the temperature decreases from 650 to 15 K. Below T∼ 200 K the volume …
K, we demonstrate the existence of local polarization and the formation of medium-range,
polar nanoregions (PNRs) with local rhombohedral order in a prototypical relaxor
ferroelectric Pb (Mg 1/3 Nb 2/3) O 3. We estimate the volume fraction of the PNRs as a
function of temperature and show that this fraction steadily increases from 0% to a maximum
of∼ 30% as the temperature decreases from 650 to 15 K. Below T∼ 200 K the volume …
Using neutron pair distribution function analysis over the temperature range from 1000 to 15 K, we demonstrate the existence of local polarization and the formation of medium-range, polar nanoregions (PNRs) with local rhombohedral order in a prototypical relaxor ferroelectric . We estimate the volume fraction of the PNRs as a function of temperature and show that this fraction steadily increases from 0% to a maximum of as the temperature decreases from 650 to 15 K. Below the volume fraction of the PNRs becomes significant, and PNRs freeze into the spin-glass-like state.
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