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Synthesis of La10Si6-2xBi2xO27-x as Possible Electrolyte Materials for Solid Oxide Fuel Cells

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Abstract:

La10Si6-2xBi2xO27-x (x = 0.22, 0.46 and 0.72) ceramics have been synthesized by the solid-state reaction method. The calcination temperature of La10Si6-2xBi2xO27-x was 900°C for 4 hours and the sintering temperature was 1500°C for 5 hours with the heating and cooling rates of 10°C per minute. Crystal structures of La10Si6-2xBi2xO27-x have been characterized by X-ray diffraction (XRD) and scanning electron microscope (SEM). Room temperature XRD patterns of La10Si6-2xBi2xO27-x ceramics doped with Bi3+ show hexagonal apatite structure with space group P63/m as the primary compound with minor appearance of La2SiO5 impurity as the secondary compound. As the bismuth oxide content increased the La2SiO5 impurity also increased. La10Si5.56Bi0.44O26.78 has the highest bulk density of 5.2 gcm-3 and good microstructure compared to La10Si5.08Bi0.92O26.54 and La10Si4.56Bi1.44O26.28.

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Periodical:

Materials Science Forum (Volume 889)

Pages:

173-177

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.889.173

Citation:

Cite this paper

Online since:

March 2017

Authors:

Hidayatul Qayyimah Hj Hairul Absah*, Afizul Hakem Karim, Muhammad Saifullah Abu Bakar, Lim Chee Ming, Abul Kalam Azad

Keywords:

Apatite, Doped Lanthanum Silicate, Scanning Electron Microscopy, X-Ray Diffraction

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* - Corresponding Author

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