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2000 (1)
1Author    R. E. Alonso, A. López-GarcíaRequires cookie*
 Title    Charge Distribution Model in Cubic Perovskite-type Compounds  
 Abstract    A non-zero electric field gradient tensor, detected by probes that occupy sites with cubic point group symmetry, was observed in many AB0 3 perovskite-type compounds. This breakdown of local cubic symmetry is commonly associated with the presence of oxygen vacancies around the probe. This effect in BaT^Hfi-^O-, with x = 0.7, 0.5, 0.3, 0.1, 0.05 and 0.01 is studied in this work. The cell parameters were obtained at laboratory temperature using XRD spectroscopy. The hyperfine parameters were measured at a 1X1 Ta probe in the B site using Perturbed Angular Correla-tions (PAC) spectroscopy as a function of both temperature and composition. As a common trend, a static asymmetric and distributed quadrupolar interaction, strongly dependent on composition has been observed. The results, together with those corresponding to 1 > x > 0.75, are analyzed using the point-charge model in terms of polarized oxygen vacancies, different covalence of the Ti-0 and Hf-0 bonds with computational simulation for the lattice positions of cations and oxygen vacancies. 
  Reference    Z. Naturforsch. 55a, 261—266 (2000); received August 25 1999 
  Published    2000 
  Keywords    Perovskites, Ferroelectrics Materials, Defects, Polarized Oxygen Vacancies, Electric Field Gardient 
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 TEI-XML for    default:Reihe_A/55/ZNA-2000-55a-0261.pdf 
 Identifier    ZNA-2000-55a-0261 
 Volume    55