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The cubic-to-rhombohedral phase transition of Pb(Zn1/3Nb2/3)O3 A high-resolution x-ray diffraction study on single crystals

Abstract : The cubic-to-rhombohedral (C-R) phase transition of the ferroelectric relaxor Pb(Zn1/3Nb2/3O3) is investigated by means of a high-resolution x-ray diffraction study on single crystals. The phase transition is diffuse and spreads over the temperature range TCR = 385 ± 5 K to TR = 325 ± 5 K. Below TCR, the cubic phase transforms progressively into rhombohedral domains whose average size, about 60-70 nm in the [111] direction, remains unchanged as temperature is lowered, so no growth of the R-domains is observed. At TR, the nanometric R-domains fully pave the crystal but structural mismatches between adjacent domains generate stresses, which increase as temperature is lowered. The anomalous broadening of diffraction peaks of the R-phase, which originates from size and strain effects, can be suppressed by applying a dc electric field, along the [111] direction, which transforms the polydomain state into a rhombohedral quasi-monodomain state.
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https://hal-centralesupelec.archives-ouvertes.fr/hal-02270832
Contributor : Amandine Lustrement <>
Submitted on : Monday, August 26, 2019 - 12:38:59 PM
Last modification on : Wednesday, July 1, 2020 - 4:22:03 PM

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A. Lebon, Hichem Dammak, G. Calvarin, I. Ould Ahmedou. The cubic-to-rhombohedral phase transition of Pb(Zn1/3Nb2/3)O3 A high-resolution x-ray diffraction study on single crystals. Journal of Physics: Condensed Matter, IOP Publishing, 2002, 14 (29), pp.7035-7043. ⟨10.1088/0953-8984/14/29/305⟩. ⟨hal-02270832⟩

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