@article{oai:nitech.repo.nii.ac.jp:00002400,
 author = {石澤, 伸夫},
 journal = {名古屋工業大学先進セラミックス研究センター年報 = Annual report Advanced Ceramics Research Center Nagoya Institute of Technology},
 month = {Jun},
 note = {Thermal decomposition of calcite (CaCO 3 ) was investigated by the single-crystal X-ray diffraction technique. The sample exposed in a hot air stream decomposed at approximately 839 K, whereas the sample sealed in a silica glass capillary in an air atmosphere decomposed at approximately 1192 K. By replacing the sealed gas with carbon dioxide (CO 2 ), the decomposition temperature increased to 1275 K, enabling the observation of the reversible I-IV and IV-V phase transitions of calcite at approximately 985 and 1240 K, respectively (N. Ishizawa, H. Setoguchi & K. Yanagisawa, Sci. Rep. 3, 2832, 2013). The decomposed solid product apparently maintained its original shape of calcite before decomposition, though numerous micorpores were found in the scanning electron micrograph. The composition of the decomposed product was identified as calcium oxide (CaO). The conventional decomposition mechanism expressed as CaCO 3 → CaO + CO 2 , should require reconsideration in the light of the recent micro-Raman study (L. Bayarjargal, T. G. Shumilova, A. Friedrich & B. Winkler, Eur. J. Mineral. 22, 29, 2010), in which an alternative decomposition mechanism, CaCO 3  → CaO + C + O 2 , is proposed on the basis of the experimental observation of the diamond formation from calcite under high pressure and temperature. Taking an advantage of the latter reaction which emits no CO 2 , we shall pursue various possibilities to improve processing of carbonate materials in manufacturing industries in order to reduce emission of CO 2  to the Earth's atmosphere., application/pdf},
 pages = {19--24},
 title = {方解石の熱分解について},
 volume = {2},
 year = {2014},
 yomi = {イシザワ, ノブオ}
}