Recent materials characterizations of [2D] and [3D] thin film ferroelectric structures.

Scott, J. F. and Morrison, F. D. and Miyake, M. and Zubko, P. and Lou, X. J. and Kugler, V. M. and Rios, S. and Zhang, M. and Tatsuta, T. and Tsuji, O. and Leedham, T. J. (2005) Recent materials characterizations of [2D] and [3D] thin film ferroelectric structures. Journal of the American Ceramic Society, 88. pp. 1691-1701. DOI 10.1111/j.1551-2916.2005.00486.x

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Abstract

A review is given of ceramic and single-crystal thin film ferroelectric oxides, emphasizing perovskite phases, together with some new developments on hafnia films. It is shown that singlecrystal barium titanate films behave as bulk down to at least 77 nm, with no finite size effects, no phase transition temperature shifts, and no dielectric peak broadening or change from first- to second-order transitions, suggesting that the gradient defect model of Bratkovsky and Levanyuk correctly describes such effects as extrinsic in experimental studies of equally thin ceramic thin films. In ceramic barium–strontium titanate (BST) thin films, it is shown that there is also no intrinsic broadening or shifts in phase transitions, with sharp, unshifted, bulk-like transitions observed only as re-entrant upon warming from cryogenic temperatures; this shows that phase transitions in ceramic thin films are dominated by kinetics and not thermodynamics and are definitely not equilibrium measurements. At high fields (41 GV/m), the films exhibit space charge-limited conduction; no variable-range hopping is observed, contrary to recent studies on SrTiO3. Some novel, unconventional switching processes are discussed, comparing the ‘‘perimeter effect’’ (non-equilibrium, ballistic) with Molotskii’s equilibrium model. Theory and experiment are described for [3D] nanotubes, nanorods, and nanoribbons (or micro-ribbons). The layered-structure-perovskite– pyrochlore conversion in bismuth titanate is described together with the PbO1TiO2 phase separation in lead zirconate titanate during electrical breakdown, as are novel HfO2 precursors that demonstrate enhanced temperature crystallization from the amorphous state and hence commercial advantages for frontend processing.

Item Type: Article
Uncontrolled Keywords: 2005 AREP 2005 P IA48
Subjects: 03 - Mineral Sciences
Divisions: 03 - Mineral Sciences
Journal or Publication Title: Journal of the American Ceramic Society
Volume: 88
Page Range: pp. 1691-1701
Identification Number: 10.1111/j.1551-2916.2005.00486.x
Depositing User: Sarah Humbert
Date Deposited: 18 Aug 2010 14:32
Last Modified: 23 Jul 2013 09:59
URI: http://eprints.esc.cam.ac.uk/id/eprint/1819

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