Acta Cryst. (2009). B65, 22-28 [ doi: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 a0b+c0, 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.
Keywords: morphotropic phase boundary; perovskites; piezoelectricity; Glazer tilt system.
 |   Rietveld powder data file (CIF format) (115.2 kbytes) |
| Rietveld powder data file (CIF format) (115.3 kbytes) |
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