7. Pulsed Laser Deposition of Bace0.85Y0.15O3 Films

  1. Narottam P. Bansal
  1. F. W. Dyny and
  2. A. Sayir

Published Online: 26 MAR 2008

DOI: 10.1002/9780470291245.ch7

Advances in Solid Oxide Fuel Cells: Ceramic Engineering and Science Proceedings, Volume 26, Number 4

Advances in Solid Oxide Fuel Cells: Ceramic Engineering and Science Proceedings, Volume 26, Number 4

How to Cite

Dyny, F. W. and Sayir, A. (2005) Pulsed Laser Deposition of Bace0.85Y0.15O3 Films, in Advances in Solid Oxide Fuel Cells: Ceramic Engineering and Science Proceedings, Volume 26, Number 4 (ed N. P. Bansal), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470291245.ch7

Author Information

  1. NASA-GRC, 21000 Brookpark Rd., Cleveland, OH 44135, USA

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 2005

ISBN Information

Print ISBN: 9781574982343

Online ISBN: 9780470291245

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Keywords:

  • morphology;
  • hydrogen;
  • enhanced;
  • solartron;
  • scribner

Summary

Pulsed laser deposition has been used to grow nanostructured BaCe0.85Y0.15O3-δ films. The objective is to enhance protonic conduction by reduction of membrane thickness. Sintered samples and laser targets were prepared by sintering BaCe0.85Y0.15O3-δ powders derived by solid state synthesis. Films 2 to 6 μm thick were deposited by KrF excimer laser on Si and porous Al2O3 substrates. Nanocrystalline films were fabricated at deposition temperatures of 600-800 °C at O2 pressure of 30 mTorr and laser fluence of 1.2 J/cm2. Films were characterized by x-ray diffraction, scanning electron microscopy and electrical impedance spectroscopy. Dense single phase BaCe0.85Y0.15O3-δ films with a columnar growth morphology is observed, preferred crystal growth was found to be dependent upon deposition temperature and substrate type. Electrical conductivity of bulk samples produced by solid state sintering and thin film samples were measured over a temperature range of 100 °C to 900 °C in moist argon. Electrical conduction of the fabricated films was 1 to 4 orders of magnitude lower than the sintered bulk samples. With respect to the film growth direction, activation energy for electrical conduction is 3 times higher in the perpendicular direction than the parallel direction.