期刊
出版社
INT UNION CRYSTALLOGRAPHY
DOI: 10.1107/S0108768108037361
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资金
- EPSRC Doctoral Training Account Studentship (Warwick)
- Clarendon Award (Oxford)
- Advantage West Midlands Science Cities
- Engineering and Physical Sciences Research Council [EP/G026696/1] Funding Source: researchfish
- EPSRC [EP/G026696/1] Funding Source: UKRI
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.
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