Improved protonic conductivity and Vickers hardness for lanthanum tungstate with potassium doping (La,K)28−yW4+yO54+δ

Improved protonic conductivity and Vickers hardness for lanthanum tungstate with potassium doping... The mechanical and electrical studies of a new series of materials, (La1−xKx)27.08W4.92O55.38−θ (y=0.92), are reported. The (La1−xKx)27.08W4.92O55.38−θ (x=0.00, 0.02, 0.04, 0.06, 0.08, 0.10) precursor powders were synthesized via a solid state reaction method. The results of X-ray diffraction studies show that single phase could be obtained after calcination at 1150°C, with a solid solubility limit of K+ doping x≤0.08. The sintering behavior measured by a dilatometer reveals the decrease in shrinkage of (La1−xKx)27.08W4.92O55.38−θ from room temperature to 1500°C with increasing K+ content. Scanning electron microscope observations demonstrated very dense morphology of the ceramics sintered at 1550°C. The Vickers hardness was evaluated and found to be enhanced by the slight K+ doping. Electrochemical impedance spectroscopy in air, wet air, hydrogen and wet hydrogen at various temperatures demonstrated the slight increase of the oxide-ionic and protonic conductivities of these materials with slight K+ doping. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Solid State Ionics Elsevier

Improved protonic conductivity and Vickers hardness for lanthanum tungstate with potassium doping (La,K)28−yW4+yO54+δ

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Publisher
Elsevier
Copyright
Copyright © 2015 Elsevier B.V.
ISSN
0167-2738
eISSN
1872-7689
D.O.I.
10.1016/j.ssi.2015.05.015
Publisher site
See Article on Publisher Site

Abstract

The mechanical and electrical studies of a new series of materials, (La1−xKx)27.08W4.92O55.38−θ (y=0.92), are reported. The (La1−xKx)27.08W4.92O55.38−θ (x=0.00, 0.02, 0.04, 0.06, 0.08, 0.10) precursor powders were synthesized via a solid state reaction method. The results of X-ray diffraction studies show that single phase could be obtained after calcination at 1150°C, with a solid solubility limit of K+ doping x≤0.08. The sintering behavior measured by a dilatometer reveals the decrease in shrinkage of (La1−xKx)27.08W4.92O55.38−θ from room temperature to 1500°C with increasing K+ content. Scanning electron microscope observations demonstrated very dense morphology of the ceramics sintered at 1550°C. The Vickers hardness was evaluated and found to be enhanced by the slight K+ doping. Electrochemical impedance spectroscopy in air, wet air, hydrogen and wet hydrogen at various temperatures demonstrated the slight increase of the oxide-ionic and protonic conductivities of these materials with slight K+ doping.

Journal

Solid State IonicsElsevier

Published: Oct 1, 2015

References

  • Solid State Ionics
    Iwahara, H.; Yajima, T.; Hibino, T.; Ozaki, K.; Suzuki, H.
  • Solid State Ionics
    Yajima, T.; Kazeoka, H.; Yogo, T.; Iwahara, H.

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