physica status solidi (RRL) - Rapid Research Letters · 2009 · 143 citations · 10 references
Natural SciencesMaterials SciencePhysicsCondensed Matter PhysicsSolid State PhysicsSolid-state ChemistryCrystal ChemistryCrystal SymmetryFerroelectric MaterialsPerovskite MaterialsPhase TransitionsSolid-state Phase TransitionsCrystal Structure-property RelationshipsPerovskite DielectricsPerovskite FerroelectricsPotassium Sodium NiobateRietveld AnalysisRietveld RefinementSolid-solution ThermodynamicsThermodynamics Of Ionic Solids
Abstract We report that the orthorhombic–rhombohedral phase transition temperature in sodium potassium niobate could be tuned from lower to higher than room temperature by incorporating barium zirconate into it. It is revealed that when barium zirconate is between 8 mol% and 15 mol%, the solid solution exhibits rhombohedral symmetry at room temperature. Rietveld analysis shows that the space group of the rhombohedral phase is R3m. It is suggested that a relatively larger B‐cation favors the low‐temperature phase which is a common phenomenon for perovskite ferroelectrics. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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