Size-driven relaxation and polar states in PbMg{sub 1/3}Nb{sub 2/3}O{sub 3}-based system
Journal Article
·
· Physical Review. B, Condensed Matter and Materials Physics
- Laboratoire Structures, Proprietes et Modelisation des Solides, Ecole Centrale Paris, Grande Voie des Vignes 92295 Chatenay-Malabry Cedex (France)
- Jozef Stefan Institute, Jamova 39, 1001 Ljubljana (Slovenia)
Nanocrystalline powders and ceramics with controlled grain size from 15 to 3000 nm of PbMg{sub 1/3}Nb{sub 2/3}O{sub 3}(PMN) and (PMN){sub 0.65}-(PbTiO{sub 3}){sub 0.35} (PMN-PT35) have been synthesized using the ball milling method. Dielectric experiments have revealed in PMN a disappearance of relaxation below {approx_equal}30 nm grain size and combined x-ray and Raman experiments the vanishing of correlations between polar nanoregions (PNRs). A similar study in morphotropic compound PMN-PT35 has shown the appearance of a relaxor state below {approx_equal}200 nm, associated to a destruction of the ferroelectric domains state towards PNRs in a paraelectric matrix. These phenomena are discussed in connection with pressure experiments from the literature and on the basis of polar states destabilization by both elastic and electric random fields changes associated with the size reduction.
- OSTI ID:
- 20719781
- Journal Information:
- Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Issue: 17 Vol. 72; ISSN 1098-0121
- Country of Publication:
- United States
- Language:
- English
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