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Thermally treated soil clays as ceramic raw materials: Characterization by X-ray diffraction, photoacoustic spectroscopy and electron spin resonance
AbstractSoil clay used as ceramic raw material under heat treatment was investigated using X-ray diffraction, X-ray fluorescence, photoacoustic spectroscopy — PAS and electron spin resonance — ESR. The results indicated the presence of at least three different sites for the Fe3+ ions, one of them representative of a set of distorted cubic sites. The optical absorption spectra obtained with the photoacoustic technique showed bands associated with d–d transitions of Fe3+ ions. Mullite and hematite were detected in the 1100 °C heated samples. Crystalline–amorphous–crystalline transformations were detected between 110 °C and 1100 °C. The conclusion drawn from photoacoustic and magnetic resonance measurements agreed very well with that obtained by X-ray diffraction.
Thermally treated soil clays as ceramic raw materials: Characterization by X-ray diffraction, photoacoustic spectroscopy and electron spin resonance
AbstractSoil clay used as ceramic raw material under heat treatment was investigated using X-ray diffraction, X-ray fluorescence, photoacoustic spectroscopy — PAS and electron spin resonance — ESR. The results indicated the presence of at least three different sites for the Fe3+ ions, one of them representative of a set of distorted cubic sites. The optical absorption spectra obtained with the photoacoustic technique showed bands associated with d–d transitions of Fe3+ ions. Mullite and hematite were detected in the 1100 °C heated samples. Crystalline–amorphous–crystalline transformations were detected between 110 °C and 1100 °C. The conclusion drawn from photoacoustic and magnetic resonance measurements agreed very well with that obtained by X-ray diffraction.
Thermally treated soil clays as ceramic raw materials: Characterization by X-ray diffraction, photoacoustic spectroscopy and electron spin resonance
Mota, L. (author) / Toledo, R. (author) / Faria, R.T. Jr. (author) / da Silva, E.C. (author) / Vargas, H. (author) / Delgadillo-Holtfort, I. (author)
Applied Clay Science ; 43 ; 243-247
2008-07-29
5 pages
Article (Journal)
Electronic Resource
English
Red ceramic , XRD , PAS , ESR
Electron microscopy of soil clays and related materials
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