Multi‐frequency EPR studyof Cr 3+ doped lead titanate (PbTiO 3 ) nanopowders

Abstract In our multi‐frequency EPR study of Cr 3+ doped PbTiO 3 nanopowder samples with varying mean particle size, three paramagnetic Cr 3+ centres (C1, C2, C3) with different axial fine structure (FS) parameters are identified, with one of them (C1) being compatible with former literature measure...

Full description

Saved in:
Bibliographic Details
Published inphysica status solidi (b) Vol. 239; no. 2
Main Authors Erdem, Emre, Böttcher, Rolf, Semmelhack, Hans‐Christoph, Gläsel, Hans‐Jürgen, Hartmann, Eberhard
Format Journal Article
LanguageEnglish
Published 01.10.2003
Online AccessGet full text

Cover

More Information
Summary:Abstract In our multi‐frequency EPR study of Cr 3+ doped PbTiO 3 nanopowder samples with varying mean particle size, three paramagnetic Cr 3+ centres (C1, C2, C3) with different axial fine structure (FS) parameters are identified, with one of them (C1) being compatible with former literature measurements on bulk and ceramics samples carried out in the X band. The superposition model by Newman and Urban was applied to translate the FS data into local displacements inside the distorted oxygen octahedra of the PbTiO 3 lattice. When going to nanopowder samples with mean particle size below a critical value, other than the centre C1 are no longer detectable. Instead, a new one (C4) appears, testifying a pronounced size effect. (© 2003 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
ISSN:0370-1972
1521-3951
DOI:10.1002/pssb.200309013