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Cobalt incorporation in mullite
-
Jasminka Popović
,
Emilija Tkalčec
Published/Copyright:
April 1, 2015
Abstract
Mullite samples doped with cobalt were derived from diphasic gels with constant atomic ratio (Al + Co)/Si = 3:1, where 0, 1, 2, and 3 at% of aluminum was replaced by cobalt. X-ray powder diffraction showed that the samples contained mullite phase and some amount of α-Al2O3 (for pure and doped samples) and CoAl2O4 (for doped samples). Cobalt doping caused an increase in unit-cell parameters of the mullite phase. Transmission electron microscopy and energy dispersive X-ray spectroscopy were used for sample microanalysis and determination of the chemical composition of the Co-doped mullite phase. The Rietveld method was performed for quantitative phase analysis of the samples and for structure refinement of the mullite phase in the samples. It was found that a small amount of Co2+, 0.36 wt%, substituted for Al3+ in the AlO6 octahedra of the mullite structure. Simultaneously, the same amount of tetrahedral Al3+ ions was likely substituted by Si4+ in the (Al,Si)O4 tetrahedra for the purpose of charge compensation. The remaining cobalt reacted with alumina forming CoAl2O4, and dissolved in the glassy phase. The proposed formula for Co-doped mullite is CoyAl4+2x-2ySi2-2x+yO10-x
Keywords : Co-doped mullite; ceramics; X-ray diffraction; Rietveld method; energy dispersive X-ray spectroscopy
Received: 2005-10-5
Accepted: 2006-9-21
Published Online: 2015-4-1
Published in Print: 2007-2-1
© 2015 by Walter de Gruyter Berlin/Boston
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Keywords for this article
Co-doped mullite;
ceramics;
X-ray diffraction;
Rietveld method;
energy dispersive X-ray spectroscopy
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