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Instruments / Technical Area	Publication Details	Published	Actions
I15-Extreme Conditions	Origin of the large electrostrain in BiFeO 3 -BaTiO 3 based lead-free ceramics Ge Wang , Zhongming Fan , Shunsuke Murakami , Zhilun Lu , David A. Hall , Derek C. Sinclair , Antonio Feteira , Xiaoli Tan , Jacob L. Jones , Annette K. Kleppe , Dawei Wang , Ian M. Reaney Journal Of Materials Chemistry A 21 DOI: 10.1039/C9TA07904A Diamond Proposal Number(s): [19590] Show Abstract ▼ Abstract: High electrostrain and breakdown strength (1 − x)BiFeO3-0.3BaTiO3-xNd(Li0.5Nb0.5)O3 (BF-BT-xNLN) ceramics were studied by in situ synchrotron X-ray diffraction (XRD) in combination with Rietveld refinement and conventional transmission electron microscopy. At zero field, compositions transformed from majority ferroelectric rhombohedral to pseudocubic as the NLN concentration increased, with 0.27% strain achieved at 60 kV cm−1 for x = 0.01. The large measured macroscopic strain was commensurate with peak shifting in XRD peak profiles, yielding 0.6% total strain at 150 kV cm−1. Strain anisotropy of ε200 > ε220 > ε111 was observed but despite the large applied field, no peak splitting was detected. We therefore concluded that the large electrostrain is not achieved through a conventional relaxor to field induced long-range ferroelectric transition. Instead, the data supports a model where local polar regions distort in the direction of the applied field within multiple local symmetries (pseudosymmetry) without long range correlation. We proposed that pseudosymmetry is maintained in BF-BT-xNLN even at high field (150 kV cm−1) due to the large ion radii mismatch and competing ionic/covalent bonding between Ba2+ and Bi3+ ions.	Aug 2019
I11-High Resolution Powder Diffraction	Electric field‐induced irreversible relaxor to ferroelectric phase transformations in Na 0.5 Bi 0.5 TiO 3 ‐NaNbO 3 ceramics Ge Wang , Zhilun Lu , Zhenbo Zhang , Antonio. Feteira , Chiu C. Tang , David A. Hall Journal Of The American Ceramic Society DOI: 10.1111/jace.16676 Diamond Proposal Number(s): [8699] Show Abstract ▼ Abstract: (1-x)Na0.5Bi0.5TiO3-xNaNbO3 (x=0.02, 0.04, 0.06 and 0.08) ceramics were fabricated by solid state reaction. High-resolution synchrotron x-ray powder diffraction (SXPD) data, coupled with macroscopic electromechanical measurements, reveal the occurrence of an electric field-induced irreversible crystallographic transformation for x=0.02 and 0.04, from a pseudo-cubic non-ergodic relaxor to a rhombohedral or coexisting rhombohedral-tetragonal long range-ordered ferroelectric phase respectively. The highest unipolar electrostrain, corresponding to an effective longitudinal piezoelectric strain coefficient of approximately 340 pm V-1, was obtained for x=0.04; this effect is attributed to enhanced domain switching as a result of the co-existing rhombohedral and tetragonal phases for this composition, which is critical for piezoelectric actuator applications.	Jul 2019

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