Sol-gel synthesis and characterization of barium titanate powders

A simple aqueous sol-gel route has been refined to prepare yttrium-doped barium titanate powders. Thermal decomposition of the fabricated gel was studied by means of DTA/TGA measurements. The precursor gel was intermediate calcined at 600 °C, and the final synthesis products were characterized by IR...

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Bibliographic Details
Published in:Journal of materials science 1999-10, Vol.34 (19), p.4853-4857
Main Authors: KAREIVA, A, TAUTKUS, S, RAPALAVICIUTE, R, JØRGENSEN, J.-E, LUNDTOFT, B
Format: Article
Language:English
Subjects:
Barium
Barium titanates
Cooling rate
Cross-disciplinary physics: materials science
rheology
Differential thermal analysis
Exact sciences and technology
Growth from solutions
Heat treatment
Infrared spectroscopy
Materials science
Methods of crystal growth
physics of crystal growth
Physics
Positive temperature coefficient
Roasting
Scanning electron microscopy
Sol-gel processes
Synthesis
Thermal decomposition
X ray powder diffraction
Yttrium
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Summary:A simple aqueous sol-gel route has been refined to prepare yttrium-doped barium titanate powders. Thermal decomposition of the fabricated gel was studied by means of DTA/TGA measurements. The precursor gel was intermediate calcined at 600 °C, and the final synthesis products were characterized by IR spectroscopy, X-ray powder diffraction and scanning electron microscopy. The barium titanate obtained from the calcination of the gel at 1300 °C was a tetragonal phase, and showed a positive temperature coefficient of resistivity (PTCR) effect which depends on sample cooling rate during the final heat treatment.
ISSN:0022-2461
1573-4803
DOI:10.1023/A:1004615912473