Sol-gel route to ferroelectric layer-structured perovskite SrBi 2Ta 2O 9 and SrBi 2Nb 2O 9 thin films

Kazumi Kato, Can Zheng, Jeffrey M. Finder, Sandwip Dey, Yasuyoshi Torii

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Abstract

Precursors for layer-structured perovskite thin films of SrBi 2Ta 2O 9 (SBT) and SrBi 2Nb 2O 9 (SBN) were prepared by the reactions of a strontium-bismuth double methoxyethoxide and tantalum or niobium methoxyethoxide in methoxyethanol, followed by partial hydrolysis. Several spectroscopic techniques, such as 1H-, 13C-, and 93Nb-NMR (nuclear magnetic resonance), and Fourier-transform infrared spectroscopy were used to analyze the arrangement of the metals and oxygen in the precursor molecules. The precursors contained Sr-O-M (where M is Ta or Nb) bonds (i.e., a strontium is connected to two MO 6 octahedra) and Sr-O-Bi bonds with a bismuth atom bonded to the oxygens of the MO 6 octahedron. The arrangement of metals and oxygens was considered to be similar to the layer-structured perovskite crystal sublattice. As a result, the sol-gel-derived SBT thin films crystallized, by rapid thermal annealing in an oxygen atmosphere below 550°C, and they exhibited preferred (115) orientation. The crystallinity improved and the crystallite size increased with temperature up to 700°C. In the case of SBN thin films, a low heating rate (2°C/min) was necessary for the control of the crystallographic (115) orientation, whereas a rate of 200°C/s (rapid thermal annealing) produced films that exhibited c-axis orientation. The (115) SBT thin film, heated to 700°C, exhibited improved ferroelectric properties.

Original languageEnglish (US)
Pages (from-to)1869-1875
Number of pages7
JournalJournal of the American Ceramic Society
Volume81
Issue number7
StatePublished - Jul 1998

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Perovskite
Ferroelectric materials
Sol-gels
Oxygen
Thin films
Bismuth
Strontium
Rapid thermal annealing
Metals
Niobium
Nuclear magnetic resonance
Tantalum
Crystallite size
Heating rate
Fourier transform infrared spectroscopy
Hydrolysis
Atoms
Crystals
Molecules
perovskite

ASJC Scopus subject areas

  • Ceramics and Composites

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Sol-gel route to ferroelectric layer-structured perovskite SrBi 2Ta 2O 9 and SrBi 2Nb 2O 9 thin films. / Kato, Kazumi; Zheng, Can; Finder, Jeffrey M.; Dey, Sandwip; Torii, Yasuyoshi.

In: Journal of the American Ceramic Society, Vol. 81, No. 7, 07.1998, p. 1869-1875.

Research output: Contribution to journalArticle

Kato, Kazumi ; Zheng, Can ; Finder, Jeffrey M. ; Dey, Sandwip ; Torii, Yasuyoshi. / Sol-gel route to ferroelectric layer-structured perovskite SrBi 2Ta 2O 9 and SrBi 2Nb 2O 9 thin films. In: Journal of the American Ceramic Society. 1998 ; Vol. 81, No. 7. pp. 1869-1875.
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