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20 April 2024

» pubmed » pmid15904113

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Direct observation of the formation of polar nanoregions in Pb(Mg1/3Nb2/3)O3 using neutron pair distribution function analysis
I-K Jeong ; T W Darling ; J K Lee ; Th Proffen ; R H Heffner ; J S Park ; K S Hong ; W Dmowski ; T Egami ;
Date:	15 Apr 2005
Journal:	Phys Rev Lett, 94 (14), 147602
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(Mg(1/3)Nb(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 approximately 30% as the temperature decreases from 650 to 15 K. Below T approximately 200 K the volume fraction of the PNRs becomes significant, and PNRs freeze into the spin-glass-like state.
Source:	PubMed, pmid15904113
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