Multi-frequency EPR study of Cr3+ doped lead titanate (PbTiO3) nanopowders

被引：29

作者：

Erdem, E

Böttcher, R

Semmelhack, HC

Gläsel, HJ

Hartmann, E

机构：

[1] Leibniz Inst Oberflachenmodifizierung, D-04318 Leipzig, Germany

[2] Univ Leipzig, Fak Phys & Geowissensch, Inst Expt Phys 2, D-04103 Leipzig, Germany

来源：

PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS | 2003年 / 239卷 / 02期

关键词：

ELECTRON-PARAMAGNETIC-RESONANCE; BARIUM-TITANATE; ULTRAFINE POWDERS; POLYMERIZATION; BATIO3;

D O I：

10.1002/pssb.200309013

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

In our multi-frequency EPR study of Cr3+ doped PbTiO3 nanopowder samples with varying mean particle size, three paramagnetic Cr3+ centres (Cl, C2, C3) with different axial fine structure (FS) parameters are identified, with one of them (Cl) 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 PbTiO3 lattice. When going to nanopowder samples with mean particle size below a critical value, other than the centre Cl are no longer detectable. Instead, a new one (C4) appears, testifying a pronounced size effect. (C) 2003 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

引用

页码：R7 / R9

页数：3

共 15 条

[1]

Böttcher R, 1999, PHYS STATUS SOLIDI B, V215, pR3, DOI 10.1002/(SICI)1521-3951(199910)215:2<R3::AID-PSSB99993>3.0.CO

[2]

2-I

[3] Size effect in Mn2+-doped BaTiO3 nanopowders observed by electron paramagnetic resonance [J].