Sol-gel reaction stability studied: Influence in the formation temperature and properties of ferroelectric thin films
- Department of Ceramic and Glass Engineering, CICECO, University of Aveiro, 3810-193 Aveiro (Portugal)
- IFIMUP, Faculty of Science, University of Porto, Rua do Campo Alegre, 687, 4169-007 Porto (Portugal)
Lead zirconium titanate (PZT) sol-gel solutions were prepared based on distilled lead acetate precursor solutions. A detailed analysis of the distillation effect on the lead precursor and the final PZT solution were carried out by Infrared and Raman techniques. It was found that the increase in the number of distillation steps experienced by the lead precursor solutions removes the constitutional water and increases the lead acetate-2-methoxyethanol interconnectivity; thus improving stability and avoiding the aging effect of the resulting PZT solutions. The thermal decomposition process of the PZT solutions was analyzed based on the thermogravimetric (TG) and differential thermogravimetric analysis (DTA) measurements. It was found that as the number of distillation steps in the lead precursor solutions increases, the decomposition rate increases and the formation temperature of pure perovskite PZT films decreases. X-ray diffraction (XRD) technique was used to study the film phase formation. A pure perovskite phase at 500 deg. C was found by the XRD analysis after the second distillation step. Scanning electron microscope technique was used to carry out the microstructural analysis. Dense microstructure was found in all analyzed films and an incipient columnar grain growth was revealed in PZT films prepared based on lead precursor solution with more than three distillation steps. The dependence of the dielectric, ferroelectric and piezoelectric properties on the number of distillation steps was revealed and a correlation between the distillation process, film microstructure properties and electrical performance was established.
- OSTI ID:
- 21199695
- Journal Information:
- Materials Research Bulletin, Vol. 44, Issue 3; Other Information: DOI: 10.1016/j.materresbull.2008.07.010; PII: S0025-5408(08)00253-5; Copyright (c) 2008 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0025-5408
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ACETATES
AGING
DIFFERENTIAL THERMAL ANALYSIS
DISTILLATION
FERROELECTRIC MATERIALS
GRAIN GROWTH
MICROSTRUCTURE
PEROVSKITE
PIEZOELECTRICITY
PRECURSOR
PYROLYSIS
PZT
RAMAN SPECTROSCOPY
SCANNING ELECTRON MICROSCOPY
SOL-GEL PROCESS
THERMAL GRAVIMETRIC ANALYSIS
THIN FILMS
X-RAY DIFFRACTION