Article,

Hyperfine interactions in the perovskites SrHfO3 and BaHfO3 observed with In-111/Cd-111 perturbed angular correlations

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JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS, 60 (6): 749-757 (1999)
DOI: 10.1016/S0022-3697(98)00344-8

Abstract

The electric field gradients in perovskite SrHfO3 and BaHfO3 powder samples were investigated by means of Perturbed Angular Correlation spectroscopy, using implanted In-111 hyperfine probes. The measurements cover the temperature ranges from 22 to 893 K for SrHfO3 and from 293 to 875 K for BaHfO3, respectively. In both compounds, three quadrupole interactions were established. The largest fraction showing a pronounced dynamic interaction is assigned to In-111/Cd-111 probe atoms on substitutional Hf sites in both compounds. For SrHfO3, the temperature dependence of the dynamic interaction was associated to the Pnma <-> Imma phase transition for SrHfO3 at about 700 K. We discuss the results in relation to those obtained for In-111/Cd-111-probes in PbZrO3 and BaTiO3, and for Hf-181/Ta-181-probes in AHfO(3) (A = Ca, Sr, Ba). (C) 1999 Elsevier Science Ltd. All rights reserved.

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