Issue 3, 2011
From the journal:

Nanoscale

Nanoscale electrical probing of heterogeneous ceramics: the case of giant permittivity calcium copper titanate (CaCu3Ti4O12)

Patrick Fiorenza,a   Vito Raineri,a   Matthew C. Ferrarelli,b   Derek C. Sinclairb  and  Raffaella Lo Nigro*a  

* Corresponding authors

a Istituto per la Microelettronica e Microsistemi (IMM), Consiglio Nazionale delle Ricerche (CNR), Strada VIII 5, Catania, Italy
E-mail: raffaella.lonigro@imm.cnr.it
Fax: +39 095 5968312
Tel: +39 095 5968218

b Department of Materials Science and Engineering, University of Sheffield, Sir Robert Hadfield Building, Mappin Street, S1 3JD, Sheffield, UK

Abstract

Scanning Probe Microscopy with conductive tips has been used to image and study the dielectric properties of giant permittivity CaCu3Ti4O12 ceramics at the nanoscale. Since measurements are generally carried out on sections of a sample, particular attention has been devoted to possible artefacts due to surface imperfections, such as substantial surface roughness and/or contamination that can result in controversial interpretation, particularly at nanometric spatial dimensions. A reliable surface investigation has been carried out after the definition of both the physical and geometrical unbiased criteria to avoid any artefacts due to surface roughness and/or anomalous tip–sample contact variations. The presence of insulating grain boundaries and the measurement of a depletion layer at the grain–grain boundary interfaces unambiguously demonstrate the relevance of the Internal Barrier Layer Capacitor effect, among all the proposed physical mechanisms, to explain the giant dielectric behaviour. Such imaging provided a clear correlation between the macroscopic dielectric properties and the nanometric structure at the interfaces. Moreover, the “general criteria” for reliable nanoelectrical characterization as well as the related measurement resolution have been defined.

Graphical abstract: Nanoscale electrical probing of heterogeneous ceramics: the case of giant permittivity calcium copper titanate (CaCu3Ti4O12)

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Article information

DOI
https://doi.org/10.1039/C0NR00828A
Article type
Paper
Submitted
04 Nov 2010
Accepted
01 Dec 2010
First published
14 Jan 2011

Nanoscale, 2011,3, 1171-1175

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Nanoscale electrical probing of heterogeneous ceramics: the case of giant permittivity calcium copper titanate (CaCu3Ti4O12)

P. Fiorenza, V. Raineri, M. C. Ferrarelli, D. C. Sinclair and R. Lo Nigro, Nanoscale, 2011, 3, 1171 DOI: 10.1039/C0NR00828A

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