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Transmission electron microscopic study of ferrite in sulfate-resisting Portland cement clinker
The oxide interstitial material in industrial clinker for sulfate-resisting Portland cement was extracted using salicylic acid and investigated by transmission electron microscopy and X-ray powder diffraction (XRD). The orthorhombic unit cell parameters of the ferrite phase were determined for two samples by XRD: (1) a = 5.529, b = 14.542, c = 5.347 angstroms; and (2) a = 5.550, b = 14.526, c = 5.347 angstroms. Energy dispersive X-ray microanalysis indicated that the ferrite normally had an atomic Al/Fe ratio of 0.7-0.9 and an average composition of Ca2.03Al0.72Fe0.87Mg0.11Mn0.05Si0.17Ti0.03O5 (13 analyses). Sometimes the composition varied on the micrometer scale, and areas with Al/Fe approaching 2 were observed. Electron diffraction indicated the basic structure to be of symmetry Ibm2, each layer of Bragg spots perpendicular to c* being accompanied by a sheet of diffuse intensity. It is proposed that the diffuse scattering is generated by a disordered array of single tetrahedral chains with reversed polarity in the brownmillerite-type crystal structure.
Transmission electron microscopic study of ferrite in sulfate-resisting Portland cement clinker
The oxide interstitial material in industrial clinker for sulfate-resisting Portland cement was extracted using salicylic acid and investigated by transmission electron microscopy and X-ray powder diffraction (XRD). The orthorhombic unit cell parameters of the ferrite phase were determined for two samples by XRD: (1) a = 5.529, b = 14.542, c = 5.347 angstroms; and (2) a = 5.550, b = 14.526, c = 5.347 angstroms. Energy dispersive X-ray microanalysis indicated that the ferrite normally had an atomic Al/Fe ratio of 0.7-0.9 and an average composition of Ca2.03Al0.72Fe0.87Mg0.11Mn0.05Si0.17Ti0.03O5 (13 analyses). Sometimes the composition varied on the micrometer scale, and areas with Al/Fe approaching 2 were observed. Electron diffraction indicated the basic structure to be of symmetry Ibm2, each layer of Bragg spots perpendicular to c* being accompanied by a sheet of diffuse intensity. It is proposed that the diffuse scattering is generated by a disordered array of single tetrahedral chains with reversed polarity in the brownmillerite-type crystal structure.
Transmission electron microscopic study of ferrite in sulfate-resisting Portland cement clinker
Landa-Canovas, A.R. (author) / Hansen, S. (author)
Cement and Concrete Research ; 29 ; 679-686
1999
8 Seiten, 22 Quellen
Article (Journal)
English
Transmission electron microscopic study of ferrite in sulfate-resisting Portland cement clinker
| Online Contents | 1999
Transmission electron microscopic study of ferrite in sulfate-resisting Portland cement clinker^1
| British Library Online Contents | 1999
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