Interacciones cuadripolares en SrHfO3

A. LÓPEZ GARCÍA; R. E. ALONSO

BOLETíN DE LA SOCIEDAD ESPAñOLA DE CERáMICA Y VIDRIO

SOC ESPANOLA CERAMICA VIDRIO

Año: 2004 vol. 43 p. 695 - 697

0366-3175

Quadrupole interactions in SrZrO3.3. The SrMO3 compounds with M = Ru, Zr ó Hf display similar structures. They are orthorhombic at room temperature (RT) and transform into tetragonal (I4/mcm) and cubic (Pm3 – m) at higher temperatures. These structures are characterized by rotations of the quasi-rigid oxygen octahedron through different axes. As temperature increases the rotation axes changes at the transition temperature but the M-O distances remain almost constant (1%) in the whole temperature range. The crystallographic study of the tetragonal to cubic transformation shows that it occurs by the rotation φ(TC)→0 of the rigid oxygen octahedron about the c axis. This transition is of second order and can be described by3 compounds with M = Ru, Zr ó Hf display similar structures. They are orthorhombic at room temperature (RT) and transform into tetragonal (I4/mcm) and cubic (Pm3 – m) at higher temperatures. These structures are characterized by rotations of the quasi-rigid oxygen octahedron through different axes. As temperature increases the rotation axes changes at the transition temperature but the M-O distances remain almost constant (1%) in the whole temperature range. The crystallographic study of the tetragonal to cubic transformation shows that it occurs by the rotation φ(TC)→0 of the rigid oxygen octahedron about the c axis. This transition is of second order and can be described byφ(TC)→0 of the rigid oxygen octahedron about the c axis. This transition is of second order and can be described by φ(T) ∼ φ0 (TC-T)β. β is the critical exponent and was fitted to ½ , ¼ and 1/8 for M = Hf, Zr and Ru, respectively. The electronic structure of these compounds should follows such changes and can be studied through the measurement of the quadrupole interaction as a function of temperature. In this contribution these results obtained by Perturbed Angular Correlations spectroscopy (PAC) for SrZrO3 are discussed.(T) ∼ φ0 (TC-T)β. β is the critical exponent and was fitted to ½ , ¼ and 1/8 for M = Hf, Zr and Ru, respectively. The electronic structure of these compounds should follows such changes and can be studied through the measurement of the quadrupole interaction as a function of temperature. In this contribution these results obtained by Perturbed Angular Correlations spectroscopy (PAC) for SrZrO3 are discussed.3 are discussed.