Jump to main content
Jump to site search
Publishing
Advanced

Issue 34, 2013
Previous Article Next Article

Non-stoichiometry in “CaCu3Ti4O12” (CCTO) ceramics†

Rainer Schmidt,*a   Shubhra Pandey,bc   Patrick Fiorenzad  and  Derek C. Sinclairb  
Author affiliations

* Corresponding authors

a Universidad Complutense de Madrid, Departamento Física Aplicada III, GFMC, Facultad de Ciencias Físicas, 28040 Madrid, Spain
E-mail: rainerxschmidt@googlemail.com

b The University of Sheffield, Materials Science and Engineering, Mappin Street, Sheffield, United Kingdom

c Indian Institute of Technology Kanpur, Department of Materials Science and Engineering, Kalyanpur, Kanpur - 208 016, India

d CNR-IMM, Strada VIII n.5, Zona Industriale, 95121 Catania, Italy

Abstract

A combined powder X-ray lattice parameter and ceramic impedance spectroscopy study is presented on materials within the CaO–CuO–TiO2 ternary phase diagram. Several compositions containing CaCu3Ti4O12 (CCTO) and small amounts of secondary phases such as TiO2, CaTiO3 and CuO are analysed and two different defect mechanisms are identified as the cause of the non-stoichiometry in CCTO. The first mechanism involves a variation in the Cu content, which explains the large differences in the intrinsic bulk and extrinsic grain boundary (GB) resistance, and the formation of the ceramic internal barrier layer capacitor (IBLC) structure. The second mechanism is associated with Ca–Cu anti-site disorder causing an unusually high intrinsic bulk permittivity above that predicted from Clausius–Mossotti calculations.

Graphical abstract: Non-stoichiometry in “CaCu3Ti4O12” (CCTO) ceramics

Back to tab navigation
Download options Please wait...

Supplementary files

Article information

https://doi.org/10.1039/C3RA41319E
Submitted
19 Mar 2013
Accepted
24 May 2013
First published
24 May 2013
This article is Open Access
Creative Commons BY license
RSC Adv., 2013,3, 14580-14589
Article type
Paper
Permissions
Request permissions

Non-stoichiometry in “CaCu3Ti4O12” (CCTO) ceramics

R. Schmidt, S. Pandey, P. Fiorenza and D. C. Sinclair, RSC Adv., 2013, 3, 14580
DOI: 10.1039/C3RA41319E

This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. Material from this article can be used in other publications provided that the correct acknowledgement is given with the reproduced material.

Reproduced material should be attributed as follows:

  • For reproduction of material from NJC:
    [Original citation] - Published by The Royal Society of Chemistry (RSC) on behalf of the Centre National de la Recherche Scientifique (CNRS) and the RSC.
  • For reproduction of material from PCCP:
    [Original citation] - Published by the PCCP Owner Societies.
  • For reproduction of material from PPS:
    [Original citation] - Published by The Royal Society of Chemistry (RSC) on behalf of the European Society for Photobiology, the European Photochemistry Association, and RSC.
  • For reproduction of material from all other RSC journals:
    [Original citation] - Published by The Royal Society of Chemistry.

Information about reproducing material from RSC articles with different licences is available on our Permission Requests page.

Social activity

Search articles by author

Spotlight

Advertisements