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Structures of K0.05Na0.95NbO3 (50–300 K) and K0.30Na0.70NbO3 (100–200 K)
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Zhang, N. (Nan), Glazer, A. M. (Anthony Michael), Baker, Daniel William and Thomas, Pam A.. (2009) Structures of K0.05Na0.95NbO3 (50–300 K) and K0.30Na0.70NbO3 (100–200 K). Acta Crystallographica. Section B: Structural Science, Vol.65 (No.3). pp. 291-299. ISSN 0108-7681
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Official URL: http://dx.doi.org/10.1107/S0108768109011057
Abstract
Rietveld refinement using neutron powder diffraction data is reported for the potential lead-free piezoelectric material KxNa1 - xNbO3 (x = 0.05, x = 0.3) at low temperatures. The structures were determined to be of rhombohedral symmetry, space group R3c, with the tilt system a-a-a- for both compositions. It was found that some of the structural parameters differ significantly in the two structures, and particularly the NbO6 octahedral strains as a function of temperature. The 300 K profile for K0.05Na0.95NbO3 shows the coexistence of rhombohedral and monoclinic phases, which indicates that the phase boundary is close to room temperature; the phase boundary for K0.30Na0.70NbO3 is found to be at approximately 180 K.
| Item Type: | Journal Article |
|---|---|
| Subjects: | Q Science > QD Chemistry |
| Divisions: | Faculty of Science > Physics |
| Library of Congress Subject Headings (LCSH): | Rietveld method, X-ray crystallography -- Technique, Neutrons -- Diffraction, Piezoelectric materials, Matter -- Properties |
| Journal or Publication Title: | Acta Crystallographica. Section B: Structural Science |
| Publisher: | Wiley-Blackwell Munksgaard |
| ISSN: | 0108-7681 |
| Date: | June 2009 |
| Volume: | Vol.65 |
| Number: | No.3 |
| Page Range: | pp. 291-299 |
| Identification Number: | 10.1107/S0108768109011057 |
| Status: | Peer Reviewed |
| Access rights to Published version: | Open Access |
| Funder: | Clarendon Fund (CF), Engineering and Physical Sciences Research Council (EPSRC) |
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| URI: | http://wrap.warwick.ac.uk/id/eprint/904 |
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