Hyperfine Characterization of SrTi(x)Hf(1-x)O(3)

ROBERTO E. ALONSO; MARTIN FALABELLA; ALBERTO LOPEZ GARCIA

PHYSICA B - CONDENSED MATTER

ELSEVIER LTD.

Lugar: Amsterdam; Año: 2007 vol. 389 p. 111 - 115

0921-4526

In order to study how the Hf replacement by Ti affects the crystalline structure of SrHfO3 pure perovskite, X-ray diffraction (XRD) studies and hyperfine characterization of SrTixHf1-xO3 for the compositions x = 0.25, 0.50 and 0.75 are reported. The structure at room temperature (RT) was determined by XRD. Hyperfine electric quadrupole interaction at Ta probes was determined by perturbed angular correlation spectroscopy. For every sample, spin precession curves were measured from RT to 1000º C, in 50º C steps. From the data fit it was determined that fur x = 0.25 the compound is orthorhombic (Pnma) at RT and undergoes one first-order and one second-order phase transitions at 550 and 750º C, respectively. For x = 0.50 the compound is in the orthorhombic (Cmcm) phase at RT and undergoes a second-order phase transition at about 250º C. For x = 0.75, the compound is cubic (Pm-3m) from RT on. Also, comparison with other perovskite-type compound studies is performed.