Second Order Tetragonal-to-Cubic Phase Transition in Sr0.5Ba0.5HfO3

R. E. ALONSO; C. HOROWITZ; A. LÓPEZ GARCÍA

SOLID STATE COMMUNICATIONS

Año: 2001 vol. 120 p. 205 - 212

0038-1098

Abstract We report the crystal structure together with the electric field gradient (EFG) tensor at the Hf site in Sr0.5Ba0.5HfO3 as a function of temperature. High-temperature X-ray diffraction (HTXRD) data show a second-order tetragonal-to-cubic phase transition at 700 K. The hyperfine interaction measured at 181Ta probe corresponds to a static, asymmetric and disordered EFG. The hyperfine parameters Vzz and h also display evident changes close to 673 K confirming the phase transition observed by XRD. The line width of the quadrupole interaction is relatively small compared with other perovskite-type compounds.