Structures of K0.05Na0.95NbO3 (50–300 K) and K0.30Na0.70NbO3 (100–200 K)
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
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|
|Official Date:||June 2009|
|Page Range:||pp. 291-299|
|Access rights to Published version:||Open Access|
|Funder:||Clarendon Fund (CF), Engineering and Physical Sciences Research Council (EPSRC)|
Ahtee, M. & Glazer, A. M. (1976). Acta Cryst. A32, 434-446.
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