Correlations of structural, magnetic, and dielectric properties of undoped and doped CaCu3Ti4O12

  • S. Krohns
  • J. Lu
  • P. Lunkenheimer
  • V. Brizé
  • C. Autret-Lambert
  • M. Gervais
  • F. Gervais
  • F. Bourée
  • F. Porcher
  • A. Loidl
Solid State and Materials

Abstract

The present work reports synthesis, as well as a detailed and careful characterization of structural, magnetic, and dielectric properties of differently tempered undoped and doped CaCu3Ti4O12 (CCTO) ceramics. For this purpose, neutron and X-ray powder diffraction, SQUID measurements, and dielectric spectroscopy have been performed. Mn-, Fe-, and Ni-doped CCTO ceramics were investigated in great detail to document the influence of low-level doping with 3d metals on the antiferromagnetic structure and dielectric properties. In the light of possible magnetoelectric coupling in these doped ceramics, the dielectric measurements were also carried out in external magnetic fields up to 7 T. At low temperatures the dielectric constant shows a minor but significant dependence on the applied magnetic field. Undoped CCTO is well-known for its colossal dielectric constant in a broad frequency and temperature range. With the present extended characterization of doped as well as undoped CCTO, we want to address the question why doping with only 1% Mn or 0.5% Fe decreases the room-temperature dielectric constant of CCTO by a factor of ~100 with a concomitant reduction of the conductivity, whereas 0.5% Ni doping changes the dielectric properties only slightly. In addition, diffraction experiments and magnetic investigations were undertaken to check for possible correlations of the magnitude of the colossal dielectric constants with structural details or with magnetic properties like the magnetic ordering, the Curie-Weiss temperatures, or the paramagnetic moment. It is revealed, that while the magnetic ordering temperature and the effective moment of all investigated CCTO ceramics are rather similar, there is a dramatic influence of doping and tempering time on the Curie-Weiss constant.

PACS

77.22.Ch Permittivity (dielectric function) 77.84.Dy Niobates, titanates, tantalates, PZT ceramics, etc. 75.50.Ee Antiferromagnetics 

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Copyright information

© EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2009

Authors and Affiliations

  • S. Krohns
    • 1
  • J. Lu
    • 1
    • 2
  • P. Lunkenheimer
    • 1
  • V. Brizé
    • 3
  • C. Autret-Lambert
    • 3
  • M. Gervais
    • 3
  • F. Gervais
    • 3
  • F. Bourée
    • 4
  • F. Porcher
    • 4
  • A. Loidl
    • 1
  1. 1.Experimental Physics V, Center for Electronic Correlations and Magnetism, University of AugsburgAugsburgGermany
  2. 2.School of Materials Science and Engineering, University of Science and Technology BeijingBeijingP.R. China
  3. 3.Laboratoire LEMA, UMR 6157 CNRS-CEA, Université F. RabelaisToursFrance
  4. 4.Laboratoire Léon Brillouin CEA SaclayGif-sur-Yvette CedexFrance

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