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Easy induction of a ferroelectric fourfold monoclinic domain state from a tetragonal ferroelectric monodomain state in PbZn1/3Nb 2/3O3

Abstract : We report a combined pyroelectric, dielectic and structural characterization of PZN single crystals in field cooling (FC) run along [001]. The pyroelectric current and the dielectric permittivity show a new characteristic temperature, at T approximate to 370 K, related to a macroscopic competition between two induced ferroelectric tetragonal (T) and monoclinic (M) phases. The phase transition, which starts around TC-R = 385 K, spreads over a large temperature range and some amount of T-phase is still observed at room temperature (RT). The M-T phase mixture, induced below TC-R, is stable after field removal. According to a previous Raman scattering work, a fourfold symmetry of M-domains is proposed; the residual T-phase is stabilized by the coexistence of four symmetry-allowed M-domains arranged around[001]. Our results confirm that in a restricted temperature range (TC-R - 20 K, TC-R + 20 K) the free energy of the relaxor-ferroelectric PZN is almost independent of the direction of polarization and accordingly the material can switch from one polar order to the other.
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https://hal.archives-ouvertes.fr/hal-00114038
Contributor : Nabil Boughnim <>
Submitted on : Wednesday, November 15, 2006 - 1:25:04 PM
Last modification on : Thursday, April 15, 2021 - 12:22:01 PM

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A. Lebon, H. Dammak, G. Calvarin. Easy induction of a ferroelectric fourfold monoclinic domain state from a tetragonal ferroelectric monodomain state in PbZn1/3Nb 2/3O3. Journal of Physics: Condensed Matter, IOP Publishing, 2005, 17 (41), pp.6385-6391. ⟨10.1088/0953-8984/17/41/009⟩. ⟨hal-00114038⟩

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