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Journal articles
Tetragonal and rhombohedral induced polar order from the relaxor state of PbZn1/3Nb2/3O3
Abstract : Structural and dielectric characterizations of the relaxor ferroelectric PbZn1/3Nb2/3 (PZN) were carried out on single crystals in the temperature range of the dielectric anomaly (370 K andlt; T andlt; 440 K), under dc electric field applied along [001]- and [111]-directions. Two ferroelectric phases, tetragonal (T) and rhombohedral (R), can be field induced in this temperature range, the symmetry of which depends on the direction of the applied field. [001] and [111] respectively. E-T diagrams were built and interpreted under the consideration of polar nano-regions (PNRs) with a prominent tetragonal component. These PNRs prevent the onset of a monodomain state when the field is applied along [111] and explain the features of PZN for an applied field along [001] large lattice strain, easy onset of the T phase and suppression of the dielectric relaxation for E ≥ 1.5 kV cm-1. The microscopic origin of these PNRs can be discussed in relation with recent nuclear magnetic resonance and structural results reported in other isomorphous relaxors.
Keywords :
Ferroelectric phases
Isomorphous relaxors
Characterization
Composition
Crystal lattices
Crystal structure
Dielectric materials
Dielectric relaxation
Electric field effects
Magnetic domains
Nuclear magnetic resonance
Phase diagrams
Thermal effects
Lattice strain
Monodomain states
Polar nano regions
Lead compounds
https://hal-centralesupelec.archives-ouvertes.fr/hal-02270842
Contributor : Amandine Lustrement <>
Submitted on : Monday, August 26, 2019 - 12:39:23 PM
Last modification on : Wednesday, July 1, 2020 - 4:22:03 PM
Contributor : Amandine Lustrement <>
Submitted on : Monday, August 26, 2019 - 12:39:23 PM
Last modification on : Wednesday, July 1, 2020 - 4:22:03 PM