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Research Papers

Yttrium-Doped Barium Zirconates as Ceramic Conductors in the Intermediate Temperature Range

[+] Author and Article Information
S. Higgins, N. M. Sammes, A. Smirnova

Department of Materials Science and Engineering, University of Connecticut, 44 Weaver Road, Storrs, CT 06269

J. A. Kilner

Department of Materials, Imperial College London, Prince Consort Road, London SW7 2BP, United Kingdom

G. Tompsett

Department of Chemical Engineering, University of Massachusetts, 159 Goessmann Lab, Amhurst, MA 01003

J. Fuel Cell Sci. Technol 5(1), 011003 (Jan 16, 2008) (4 pages) doi:10.1115/1.2756570 History: Received December 01, 2005; Revised April 27, 2007; Published January 16, 2008

A modified Pechini process has been used to synthesize perovskite-structured yttrium-doped barium zirconate of the form BaZr0.85Y0.15O3-δ (BZY15). The X-ray diffraction pattern for the sintered material (5h at 1500°C) confirms a cubic structure with unit cell parameter of 8.424Å. Scanning electron microscopy images reveal a dense electrolyte structure. Thermal analysis (TGA/DTA) was also conducted on the material to determine possible endothermic and exothermic peaks and phase transformations. Raman spectroscopy data indicated that the most intense band in the spectrum of BZY15 occurs at 616cm1, which suggests that cubic zirconia (Zr-O) vibrations are present. No bands were observed for secondary oxides, such as BaO, which would have a characteristic sharp band at 949cm1, or Y2O3, whose characteristic band occurs at 376cm1. AC-impedance measurements at 600°C indicate that the conductivity of the sample is higher in humidified gases compared to dry ones and has the lowest value in humidified air.

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Copyright © 2008 by American Society of Mechanical Engineers
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Figures

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Figure 1

The XRD spectrum for BaZr0.85Y0.15O3-δ is presented. Prominent peaks corresponding to yttrium-doped barium zirconate are indicated

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Figure 2

The SEM image of BaZr0.85Y0.15O3-δ at 6500× gives evidence for a very dense material

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Figure 3

TGA/DTA curves for BaZr0.85Y0.15O3-δ sintered at 1200°C

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Figure 4

Raman spectra of (a) unfired and (b)BaZr0.85Y0.15O3-δ fired at 1500°C

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Figure 5

Nyquist plots for BaZr0.85Y0.15O3-δ exposed to different atmospheres at 600°C

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