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Non-ambient X-ray and neutron diffraction of novel relaxor ferroelectric x(Bi2(Zn2/3, Nb1/3)O7 – (1-x)BaTiO3 (BZN-BT)
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Marshall, Jessica M., Walker, David and Thomas, Pam A. (2021) Non-ambient X-ray and neutron diffraction of novel relaxor ferroelectric x(Bi2(Zn2/3, Nb1/3)O7 – (1-x)BaTiO3 (BZN-BT). Journal of Applied Crystallography, 54 . pp. 1437-1454. doi:10.1107/S160057672100858X ISSN 0021-8898.
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Official URL: https://doi.org/10.1107/S160057672100858X
Abstract
The first determination of the phase diagram of the novel ferroelectric relaxor xBi(Zn2/3 Nb1/3)O3-BaTiO3 (BZN-BT) with combined high resolution X-ray and neutron up to the miscibility limit near x(BZN) = 20.0% over a temperature range 20 K < T < 400 K. Combined X-ray and neutron data shows instability within the xBZN-(1-x)BT system reaches a maximum at x = 3.9% and is driven by B-site displacement and distortion of the oxygen octahedra in the polar phases Composition-dependant effects include a narrow Amm2-dominated region focused at x = 3.9%, significant convergence of the lattice parameters in both P4mm and Amm2 phases and a sharp maxima in d33 and Psat. Lattice parameter dilation at x ≥ 4.0% was observed for both P4mm and Amm2 unit cells, alongside the first appearance of Pm-3m at 295 K and the onset of significant dielectric relaxation. Low-temperature neutron diffraction indicated a weak or absent temperature dependence on the transition between ferroelectric at x = 3.9% to ferroelectric relaxor at x = 4.0%. Temperature-dependant phase transitions were eliminated near x = 3.0%, with the ferroelectric limit observed at x = 5.0% and transition to a low-loss relaxor dielectric near x = 8.0%.
| Item Type: | Journal Article | |||||||||
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| Subjects: | Q Science > QC Physics T Technology > TA Engineering (General). Civil engineering (General) |
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| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | |||||||||
| Library of Congress Subject Headings (LCSH): | Neutrons -- Diffraction , X-ray diffraction imaging , Piezoelectricity, Ferroelectric crystals | |||||||||
| Journal or Publication Title: | Journal of Applied Crystallography | |||||||||
| Publisher: | International Union of Crystallography | |||||||||
| ISSN: | 0021-8898 | |||||||||
| Official Date: | November 2021 | |||||||||
| Dates: |
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| Volume: | 54 | |||||||||
| Page Range: | pp. 1437-1454 | |||||||||
| DOI: | 10.1107/S160057672100858X | |||||||||
| Status: | Peer Reviewed | |||||||||
| Publication Status: | Published | |||||||||
| Access rights to Published version: | Open Access (Creative Commons) | |||||||||
| Date of first compliant deposit: | 6 September 2021 | |||||||||
| Date of first compliant Open Access: | 30 September 2021 | |||||||||
| RIOXX Funder/Project Grant: |
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