Hyperfine Characterization of Bi(1.9)Te(0.1)SrNb(1.9)Hf0.1O9

R.E. ALONSO, A. LÓPEZ GARCÍA, J.A. MARTÍNEZ, A. CASTRO, A.R. PASCHOAL, E.N. SILVA, A.P. AYALA, I. GUEDES

SOLID STATE COMMUNICATIONS

PERGAMON-ELSEVIER SCIENCE LTD

Año: 2006 vol. 139 p. 97 - 101

0038-1098

Abstract The Aurivillius type oxide Bi1.9Te0.1SrNb1.9Hf0.1O9 has been studied by Perturbed Angular Correlations spectroscopy using 181Ta probes. The spin precession curves were measured from room temperature up to 873 K. Two sites are occupied by probes and the temperature dependence of both indicates a continuous phase transition at about 625 K. One site is ordered while the other is disordered. This situation is analyzed in terms of simple models already applied to perovskites. The transition temperature of the solid solution Bi2−xTexSrNb2−xHfxO9 (with 0  x  0.5) shows a strong dependence on composition. c 2006 Published by Elsevier Ltd shows a strong dependence on composition. c 2006 Published by Elsevier Ltd shows a strong dependence on composition. c 2006 Published by Elsevier Ltd shows a strong dependence on composition. c 2006 Published by Elsevier Ltd The spin precession curves were measured from room temperature up to 873 K. Two sites are occupied by probes and the temperature dependence of both indicates a continuous phase transition at about 625 K. One site is ordered while the other is disordered. This situation is analyzed in terms of simple models already applied to perovskites. The transition temperature of the solid solution Bi2−xTexSrNb2−xHfxO9 (with 0  x  0.5) shows a strong dependence on composition. c 2006 Published by Elsevier Ltd shows a strong dependence on composition. c 2006 Published by Elsevier Ltd shows a strong dependence on composition. c 2006 Published by Elsevier Ltd shows a strong dependence on composition. c 2006 Published by Elsevier Ltd The spin precession curves were measured from room temperature up to 873 K. Two sites are occupied by probes and the temperature dependence of both indicates a continuous phase transition at about 625 K. One site is ordered while the other is disordered. This situation is analyzed in terms of simple models already applied to perovskites. The transition temperature of the solid solution Bi2−xTexSrNb2−xHfxO9 (with 0  x  0.5) shows a strong dependence on composition. c 2006 Published by Elsevier Ltd shows a strong dependence on composition. c 2006 Published by Elsevier Ltd shows a strong dependence on composition. c 2006 Published by Elsevier Ltd shows a strong dependence on composition. c 2006 Published by Elsevier Ltd The spin precession curves were measured from room temperature up to 873 K. Two sites are occupied by probes and the temperature dependence of both indicates a continuous phase transition at about 625 K. One site is ordered while the other is disordered. This situation is analyzed in terms of simple models already applied to perovskites. The transition temperature of the solid solution Bi2−xTexSrNb2−xHfxO9 (with 0  x  0.5) shows a strong dependence on composition. c 2006 Published by Elsevier Ltd shows a strong dependence on composition. c 2006 Published by Elsevier Ltd shows a strong dependence on composition. c 2006 Published by Elsevier Ltd shows a strong dependence on composition. c 2006 Published by Elsevier Ltd 1.9Te0.1SrNb1.9Hf0.1O9 has been studied by Perturbed Angular Correlations spectroscopy using 181Ta probes. The spin precession curves were measured from room temperature up to 873 K. Two sites are occupied by probes and the temperature dependence of both indicates a continuous phase transition at about 625 K. One site is ordered while the other is disordered. This situation is analyzed in terms of simple models already applied to perovskites. The transition temperature of the solid solution Bi2−xTexSrNb2−xHfxO9 (with 0  x  0.5) shows a strong dependence on composition. c 2006 Published by Elsevier Ltd shows a strong dependence on composition. c 2006 Published by Elsevier Ltd shows a strong dependence on composition. c 2006 Published by Elsevier Ltd shows a strong dependence on composition. c 2006 Published by Elsevier Ltd 2−xTexSrNb2−xHfxO9 (with 0  x  0.5) shows a strong dependence on composition. c 2006 Published by Elsevier Ltd Keywords: Ferroelectrics; Hyperfine interactions; Solid solution; Phase transition; Point defectsFerroelectrics; Hyperfine interactions; Solid solution; Phase transition; Point defects