Thin Films Grown by Pulsed Laser Deposition
Ionic Conductivity in Yttria-Stabilized Zirconia Thin Films grown by Pulsed Laser Deposition
Jetske Karina Stortelder Master of Science Thesis Faculty of Science and Technology Inorganic Materials Science Mesa+ Institute for Nanotechnology Enschede, August 2005
Ionic Conductivity in Yttria-Stabilized Zirconia Thin Films grown by Pulsed Laser Deposition
Master of Science Thesis by Jetske Karina Stortelder Enschede, August 26th 2005
Graduation Committee Prof. Dr. Ing. D.H.A. Blank Dr. Ing. A.J.H.M. Rijnders Ir. F. Vroegindeweij Dr. H.J.M. Bouwmeester Dr. B.J. Ravoo Dr. Ir. B. Timmer (Texas Instruments)
Ionic Conductivity in Yttria-Stabilized Zirconia Thin Films grown by Pulsed Laser Deposition
Summary
In this report the ionic conductivity of yttria-stabilized zirconia (YSZ) is researched. YSZ transports oxygen through its lattice and can, for example, be used for the detection of oxygen and, indirectly, for harmful NOx gasses that contribute to environmental problems. The objective of this research was to determine the influence of the crystal structure on the ionic conductivity of YSZ thin films produced by pulsed laser deposition. The materials used for the electrodes and wiring of the samples, the measurement set-up and the sample configuration played an important role in obtaining successful impedance measurements in temperatures up to 900ºC. Part of this research was therefore contributed to finding the optimal conditions for ionic conductivity measurements on YSZ thin films. Four electrode materials were chosen and tested, knowing SrRuO3, Pt, Au and Pt-paste, but only SrRuO3 and Pt were useful until 700ºC. After that temperature the films started to segregate, which reduced the electrode contact area and increased the resistance. So none of the electrode materials was suitable to measure up to 900ºC in an oxygen environment. However, the results obtained from low temperature measurements can be extrapolated to higher temperatures to get
Jetske Karina Stortelder Master of Science Thesis Faculty of Science and Technology Inorganic Materials Science Mesa+ Institute for Nanotechnology Enschede, August 2005
Ionic Conductivity in Yttria-Stabilized Zirconia Thin Films grown by Pulsed Laser Deposition
Master of Science Thesis by Jetske Karina Stortelder Enschede, August 26th 2005
Graduation Committee Prof. Dr. Ing. D.H.A. Blank Dr. Ing. A.J.H.M. Rijnders Ir. F. Vroegindeweij Dr. H.J.M. Bouwmeester Dr. B.J. Ravoo Dr. Ir. B. Timmer (Texas Instruments)
Ionic Conductivity in Yttria-Stabilized Zirconia Thin Films grown by Pulsed Laser Deposition
Summary
In this report the ionic conductivity of yttria-stabilized zirconia (YSZ) is researched. YSZ transports oxygen through its lattice and can, for example, be used for the detection of oxygen and, indirectly, for harmful NOx gasses that contribute to environmental problems. The objective of this research was to determine the influence of the crystal structure on the ionic conductivity of YSZ thin films produced by pulsed laser deposition. The materials used for the electrodes and wiring of the samples, the measurement set-up and the sample configuration played an important role in obtaining successful impedance measurements in temperatures up to 900ºC. Part of this research was therefore contributed to finding the optimal conditions for ionic conductivity measurements on YSZ thin films. Four electrode materials were chosen and tested, knowing SrRuO3, Pt, Au and Pt-paste, but only SrRuO3 and Pt were useful until 700ºC. After that temperature the films started to segregate, which reduced the electrode contact area and increased the resistance. So none of the electrode materials was suitable to measure up to 900ºC in an oxygen environment. However, the results obtained from low temperature measurements can be extrapolated to higher temperatures to get