The preparatory optimal conditions of barium titanate thin film from a hydrothermal method at low temperature

The preparation of barium titanate thin films on Ti substrates at low temperature using the hydrothermal process was studied. In addition, the interface relationship between film and substrate was investigated, revealing that the Ba2+ ion diffused into the Ti(OH)4 gel formed by Ti in a strong alkali...

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Bibliographic Details
Published in:Journal of materials science 2007-04, Vol.42 (7), p.2376-2382
Main Authors: HUNG, Kun-Ming, HSIEH, Ching-Shieh, YANG, Wein-Duo, SUN, Yi-Jiun
Format: Article
Language:English
Subjects:
Applied sciences
Barium
Barium titanates
Building materials. Ceramics. Glasses
Ceramic industries
Chemical industry and chemicals
Cross-disciplinary physics: materials science
rheology
Crystallinity
Design optimization
Dielectric constant
Electrotechnical and electronic ceramics
Exact sciences and technology
Hydrothermal crystal growth
Liquid phase epitaxy
deposition from liquid phases (melts, solutions, and surface layers on liquids)
Low temperature
Materials science
Methods of deposition of films and coatings
film growth and epitaxy
Optimization
Orthogonal arrays
Physics
Reaction time
Sodium hydroxide
Substrates
Surface treatment
Technical ceramics
Thin films
Titanium
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Summary:The preparation of barium titanate thin films on Ti substrates at low temperature using the hydrothermal process was studied. In addition, the interface relationship between film and substrate was investigated, revealing that the Ba2+ ion diffused into the Ti(OH)4 gel formed by Ti in a strong alkaline solution, resulting in a homogeneous film. A 3-level orthogonal array design was utilized to optimize the experimental conditions. The effects of preparatory conditions such as the barium-concentration, NaOH concentration, reaction time and substrate surface treatment were systematically studied. Results indicate that the effects of the NaOH concentration and substrate surface treatment are the significant variables influencing the relative crystal intensity (intensity of (110) BaTiO3 peaks in XRD spectrum/intensity of (001) Ti peak in XRD spectrum) of the films obtained. Polycrystalline, BaTiO3-films were obtained, with improved crystallinity and a dielectric constant of about 915 at 1 MHz.
ISSN:0022-2461
1573-4803
DOI:10.1007/s10853-006-1452-2