In situ x-ray diffraction study of an electric field induced phase transition in the single crystal relaxor ferroelectric, 92% Pb(Zn1/3Nb2/3)O3–8% PbTiO3

Abstract

We have used in situ x-ray diffraction to measure strain curves of single crystals of 92% Pb(Zn1/3Nb2/3)O3–8% PbTiO3 poled in the 〈001〉 direction. We observed shifts in the (002) and (330) peaks as functions of applied voltage (in the 〈001〉 direction), thereby measuring the crystallographic strain. Our measurements confirm that the high strains observed using macroscopic methods reflect microscopic strains in the crystal lattice. By watching the disappearance of a rhombohedral splitting in the (330) peak, we also find direct evidence that the field-induced phase transition reported by S.-E. Park and T. R. Shrout [J. Appl. Phys. 82, 1804 (1997)] occurs between a pseudorhombohedral and tetragonal crystal structure.

Polarization Rotation via a Monoclinic Phase in the Piezoelectric 92%PbZn1/3Nb2/3ONoheda1, Cox2, Shirane3 et al. 2001Phys. Rev. Lett.Self Cite680314081View full textAdd to dashboardCite

“…Above the threshold field, the strain shows a sharp jump, nonlinear behavior, and hysteresis. X-ray diffraction experiments performed on PZN-8%PT crystals under an applied electric field [11] have shown that the lattice parameter vs field loop exactly reflects the strain behavior, confirming that the high macroscopic strain levels observed are due to the microscopic strain of the crystal lattice. The jump observed at the threshold field was attributed to a structural phase transition between the rhombohedral and the tetragonal phases.…”

“…1 (top), after Durbin et al [11]. For this poling configuration, the strain behaves linearly below a certain threshold field, which is smaller for compositions closer to the MPB [8,10].…”

Dependencia con la temperatura de las propiedades eléctricas, mecánicas y electromecánicas de nuevas piezocerámicas de alta sensibilidad

“…The ultrahigh electromechanical response is observed along the <001> direction of the pseudocubic structure in spite of the spontaneous polarisation being along the <111> direction. This effect was related to the occurrence of a rhombohedral to tetragonal phase transition (with polarisation rotation) under the electric field (2). A recent high energy X-ray diffraction study on 0.92PZN-0.08PT crystals has shown that the initial rhombohedral phase first transforms into a monoclinic structure (3).…”

Observation of domain texture in poled Pb(Mg1/3Nb2/3)O3–PbTiO3 crystals

“…Previous x-ray investigations have shown that surface damage is a problem in Pbbased perovskites, due to a small x-ray penetration depth ͑m range͒. [1][2][3][4]9 To reduce the surface damage, all faces of every cube were polished to a 0.25 m finish. Polishing resulted in dramatic sharpening of the diffraction peaks.…”

“…This peak width is close to 3 min obtained by higher energy x-ray sources. [1][2][3][4]9 All three ͗001͘ c faces of the PMN-PT cubes were investigated by -and -scans. The term is the angular position of the sample surface normal in the direction perpendicular to the diffraction plane, whereas is the rotation angle perpendicular to the plane of diffraction.…”