Identification of the thermal phases in firing of kaolinite to mullite by using micro-Raman spectroscopy and curve-fitting

Shlomo Shoval; Micheline Boudeulle; Gerard Panczer

doi:10.1016/j.optmat.2011.08.031

Identification of the thermal phases in firing of kaolinite to mullite by using micro-Raman spectroscopy and curve-fitting

Shlomo Shoval, Micheline Boudeulle, Gerard Panczer

Earth Sciences discipline

Research output: Contribution to journal › Article › peer-review

Abstract

Firing of kaolinite to mullite is an important process in ceramic industry. In the present study, Raman spectroscopy and curve-fitting are utilized for identification of the thermal phases in progressive firing of kaolinite to mullite up to 1300 °C. The results are compared to that observed by XRD. Many natural kaolinites consist of accessory anatase, and this mineral has strong Raman bands. Therefore, the spectra of anatase-free and anatase-containing kaolinites were analyzed. The Raman response is sensitive to the degree of the structural order of the thermal phases. Dehydroxylated kaolinite is detected at 500 °C by the disappearance of the Raman bands of the kaolinite. The metakaolinite at 700 °C and the spinel-type phase at 1000 °C have broad and weak Raman bands due to their short-range and poorly-order structure, respectively. Amorphous silica is observed at 1000 °C by the development of diagnostic broad and weak Raman bands. Mullite and cristobalite are detected at 1300 °C by the appearance of characteristic Raman bands. In firing of anatase-containing kaolinite, progressive thermal transform from anatase to rutile is observed at 1100-1300 °C by the appearance of Raman bands of rutile and by the decreasing of the anatase bands. The results can be applied in using micro-Raman spectroscopy as a non-destructive method for identification of thermal phases in the composition of modern and ancient ceramic.

Original language	English
Pages (from-to)	404-409
Number of pages	6
Journal	Optical Materials
Volume	34
Issue number	2
DOIs	https://doi.org/10.1016/j.optmat.2011.08.031
State	Published - Dec 2011

Bibliographical note

Funding Information:
This research was supported by The Open University of Israel’s Research Fund (Grant No. 31016 ). This support is gratefully acknowledged. The assistance of Galina Kaz is also highly acknowledged. The authors acknowledge the “CECOMO (CEntre Commun de Microspectrométrie Optique)”, vibrational spectroscopy platform establishing by the “Institut de Chimie de Lyon and the Rhône-Alpes Région MACODEV” program.

Keywords

Anatase
Ceramic
Cristobalite
Metakaolinite
Pottery
Thermal analysis

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10.1016/j.optmat.2011.08.031

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@article{87f7767adbe34cb6a3c9fbaf84a76cd2,

title = "Identification of the thermal phases in firing of kaolinite to mullite by using micro-Raman spectroscopy and curve-fitting",

abstract = "Firing of kaolinite to mullite is an important process in ceramic industry. In the present study, Raman spectroscopy and curve-fitting are utilized for identification of the thermal phases in progressive firing of kaolinite to mullite up to 1300 °C. The results are compared to that observed by XRD. Many natural kaolinites consist of accessory anatase, and this mineral has strong Raman bands. Therefore, the spectra of anatase-free and anatase-containing kaolinites were analyzed. The Raman response is sensitive to the degree of the structural order of the thermal phases. Dehydroxylated kaolinite is detected at 500 °C by the disappearance of the Raman bands of the kaolinite. The metakaolinite at 700 °C and the spinel-type phase at 1000 °C have broad and weak Raman bands due to their short-range and poorly-order structure, respectively. Amorphous silica is observed at 1000 °C by the development of diagnostic broad and weak Raman bands. Mullite and cristobalite are detected at 1300 °C by the appearance of characteristic Raman bands. In firing of anatase-containing kaolinite, progressive thermal transform from anatase to rutile is observed at 1100-1300 °C by the appearance of Raman bands of rutile and by the decreasing of the anatase bands. The results can be applied in using micro-Raman spectroscopy as a non-destructive method for identification of thermal phases in the composition of modern and ancient ceramic.",

keywords = "Anatase, Ceramic, Cristobalite, Metakaolinite, Pottery, Thermal analysis",

author = "Shlomo Shoval and Micheline Boudeulle and Gerard Panczer",

note = "Funding Information: This research was supported by The Open University of Israel{\textquoteright}s Research Fund (Grant No. 31016 ). This support is gratefully acknowledged. The assistance of Galina Kaz is also highly acknowledged. The authors acknowledge the “CECOMO (CEntre Commun de Microspectrom{\'e}trie Optique)”, vibrational spectroscopy platform establishing by the “Institut de Chimie de Lyon and the Rh{\^o}ne-Alpes R{\'e}gion MACODEV” program.",

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AU - Boudeulle, Micheline

AU - Panczer, Gerard

N1 - Funding Information: This research was supported by The Open University of Israel’s Research Fund (Grant No. 31016 ). This support is gratefully acknowledged. The assistance of Galina Kaz is also highly acknowledged. The authors acknowledge the “CECOMO (CEntre Commun de Microspectrométrie Optique)”, vibrational spectroscopy platform establishing by the “Institut de Chimie de Lyon and the Rhône-Alpes Région MACODEV” program.

PY - 2011/12

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N2 - Firing of kaolinite to mullite is an important process in ceramic industry. In the present study, Raman spectroscopy and curve-fitting are utilized for identification of the thermal phases in progressive firing of kaolinite to mullite up to 1300 °C. The results are compared to that observed by XRD. Many natural kaolinites consist of accessory anatase, and this mineral has strong Raman bands. Therefore, the spectra of anatase-free and anatase-containing kaolinites were analyzed. The Raman response is sensitive to the degree of the structural order of the thermal phases. Dehydroxylated kaolinite is detected at 500 °C by the disappearance of the Raman bands of the kaolinite. The metakaolinite at 700 °C and the spinel-type phase at 1000 °C have broad and weak Raman bands due to their short-range and poorly-order structure, respectively. Amorphous silica is observed at 1000 °C by the development of diagnostic broad and weak Raman bands. Mullite and cristobalite are detected at 1300 °C by the appearance of characteristic Raman bands. In firing of anatase-containing kaolinite, progressive thermal transform from anatase to rutile is observed at 1100-1300 °C by the appearance of Raman bands of rutile and by the decreasing of the anatase bands. The results can be applied in using micro-Raman spectroscopy as a non-destructive method for identification of thermal phases in the composition of modern and ancient ceramic.

AB - Firing of kaolinite to mullite is an important process in ceramic industry. In the present study, Raman spectroscopy and curve-fitting are utilized for identification of the thermal phases in progressive firing of kaolinite to mullite up to 1300 °C. The results are compared to that observed by XRD. Many natural kaolinites consist of accessory anatase, and this mineral has strong Raman bands. Therefore, the spectra of anatase-free and anatase-containing kaolinites were analyzed. The Raman response is sensitive to the degree of the structural order of the thermal phases. Dehydroxylated kaolinite is detected at 500 °C by the disappearance of the Raman bands of the kaolinite. The metakaolinite at 700 °C and the spinel-type phase at 1000 °C have broad and weak Raman bands due to their short-range and poorly-order structure, respectively. Amorphous silica is observed at 1000 °C by the development of diagnostic broad and weak Raman bands. Mullite and cristobalite are detected at 1300 °C by the appearance of characteristic Raman bands. In firing of anatase-containing kaolinite, progressive thermal transform from anatase to rutile is observed at 1100-1300 °C by the appearance of Raman bands of rutile and by the decreasing of the anatase bands. The results can be applied in using micro-Raman spectroscopy as a non-destructive method for identification of thermal phases in the composition of modern and ancient ceramic.

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Identification of the thermal phases in firing of kaolinite to mullite by using micro-Raman spectroscopy and curve-fitting

Abstract

Bibliographical note

Keywords

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