2. Synthesis, Characterization and Measurements of Electrical Properties of Alumina-Titania Nano-Composites

  1. William M. Mullins,
  2. Andrew Wereszczak and
  3. Egar Lara-Curzio
  1. Vikas Somani and
  2. Samar J. Kalita

Published Online: 26 MAR 2008

DOI: 10.1002/9780470291375.ch2

Synthesis and Processing of Nanostructured Materials: Ceramic Engineering and Science Proceedings, Volume 27, Issue 8

Synthesis and Processing of Nanostructured Materials: Ceramic Engineering and Science Proceedings, Volume 27, Issue 8

How to Cite

Somani, V. and Kalita, S. J. (2008) Synthesis, Characterization and Measurements of Electrical Properties of Alumina-Titania Nano-Composites, in Synthesis and Processing of Nanostructured Materials: Ceramic Engineering and Science Proceedings, Volume 27, Issue 8 (eds W. M. Mullins, A. Wereszczak and E. Lara-Curzio), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470291375.ch2

Author Information

  1. Department of Mechanical, Materials and Aerospace Engineering University of Central Florida Orlando, FL 32816-2450

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 2007

ISBN Information

Print ISBN: 9780470080511

Online ISBN: 9780470291375

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Keywords:

  • ethanol;
  • propoxide;
  • amorphous;
  • electrical;
  • temperature

Summary

In this study, we have synthesized and characterized nanocrystalline aluraina-titania (Al2O3-TiO2) composites via a simple sol-gel process, using aluminum propoxide and titanium propoxide as precursor chemicals. Propanol and 2-methoxy ethanol were used as solvent and stabilizer, respectively. The as-formed gel was heat treated at 400°C, to obtain amorphous powder. The amorphous powder was subsequently calcined at 700°C and 900°C. Phase evolution, phase composition, crystal structure and crystallite-size of the synthesized powder were determined using X-ray diffraction (XRD) technique. Crystallite-size was further confirmed by high-resolution transmission electron microscopy (HR-TEM). HR-TEM results of powder calcined at 700°C showed agglomerates of powder particles, with particle-size in 15 - 20 nm range. The synthesized powder was uniaxially pressed using a steel mold and then sintered at elevated temperature (1000-1500°C) for densification study and electrical property measurements. XRD technique was used to study phase composition of the sintered pellets. Dielectric constant and dissipation factor of the sintered pellets were measured. The effects of sintering time, temperature and phases present on the electrical properties of the sintered pellets, were studied.