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Structural study of KxNa1-xNbO3 (KNN) for compositions in the range x=0.24-0.36
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Baker, Daniel William, Thomas, Pam A., Zhang, N. and Glazer, A. M. (Anthony Michael) (2009) Structural study of KxNa1-xNbO3 (KNN) for compositions in the range x=0.24-0.36. Acta Crystallographica Section B (Structural Science), Vol.65 (No.1). pp. 22-28. doi:10.1107/S0108768108037361 ISSN 0108-7681.
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Official URL: http://dx.doi.org/10.1107/S0108768108037361
Abstract
The structure of the A-site substituted perovskite KxNa1-xNbO3, x = 0.24-0.36, where a phase boundary was previously reported, has been determined by high-resolution X-ray powder and neutron powder diffraction studies. The structure of the x = 0.3 compound was refined in the monoclinic space group Pm at 293 K and in P4mm at 523 K. The Glazer tilt system of the room-temperature monoclinic phase is a(0)b(+) c(0), which has implications for the nature of the next symmetry change with composition towards pure potassium niobate. A phase-coexistence region at the transition between monoclinic and tetragonal phases was also identified, consistent with a first-order phase boundary. There is also evidence for an intermediate oxygen-octahedra tilted tetragonal phase.
Item Type: | Journal Article | ||||
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Subjects: | Q Science > QD Chemistry | ||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
Journal or Publication Title: | Acta Crystallographica Section B (Structural Science) | ||||
Publisher: | Wiley-Blackwell Publishing, Inc | ||||
ISSN: | 0108-7681 | ||||
Official Date: | February 2009 | ||||
Dates: |
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Volume: | Vol.65 | ||||
Number: | No.1 | ||||
Number of Pages: | 7 | ||||
Page Range: | pp. 22-28 | ||||
DOI: | 10.1107/S0108768108037361 | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Restricted or Subscription Access | ||||
Funder: | Engineering and Physical Sciences Research Council (EPSRC), Clarendon Award (Oxford), Advantage West Midlands (AWM) |
Data sourced from Thomson Reuters' Web of Knowledge
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