J. Phys. IV France 128 (2005) 55-60
Study of potassium-sodium-niobate alloys: A combined experimental and theoretical approachJ. Attia1, 2, L. Bellaiche1, P. Gemeiner2, B. Dkhil2 and B. Malic3
1 Physics Department University of Arkansas Fayetteville, AR 72701, USA
2 Laboratoire Structures, Propriétés et Modélisation des Solides, CNRS-UMR 8580, École Centrale Paris Grande Voie des vignes, 92925 Châtenay-Malabry, France
3 Josef Stefan Institute Jamova 39, 1000 Ljubljana, Slovenia
Experimental and theoretical techniques are combined to investigate properties of the environmentally-friendly and technologically-promising (K0.5Na0.5)NbO3 (KNN) solid solutions. Two long-range ferroelectric phases of orthorhombic and tetragonal symmetry are reported above 250K. Furthermore, our dielectric measurements, X-ray data and simulations suggest an unusual formation of rhombohedral clusters within an orthorhombic matrix at lower temperature.
© EDP Sciences 2005