Jeong, IK and Darling, TW and Lee, JK and Proffen, T and Heffner, RH and Park, JS and Hong, KS and Dmowski, W and Egami, T
(2005)
Direct observation of the formation of polar nanoregions in Pb(Mg <inf>1/3</inf>Nb<inf>2/3</inf>)O<inf>3</inf> using neutron pair distribution function analysis.
Physical Review Letters, 94 (14).
ISSN 0031-9007
Abstract
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(Mg1/3Nb 2/3)O3. 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 fraction of the PNRs becomes significant, and PNRs freeze into the spin-glass-like state. © 2005 The American Physical Society.
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