@techreport{oai:nara-edu.repo.nii.ac.jp:00011067,
 author = {的場, 宏純 and 平賀, 章三},
 month = {Mar},
 note = {The clay collected at Izumigaoka in Sakai city were fired in four temperature steps and in fifteen kinds of firing duration．On the basis of X-ray powder diffraction analysis on the fired samples，the formation or extinction of each mineral was examined as a function of firing duration．The followings have been revealed． （1）Mullite is detected after thirty-six hours' firing at lO50℃，although the △E of Mullite formation is supposed to be little at the temperature． （2）Cristobalite is also detected after twenty-four hours，firing at 1150℃． （3）The HW／I values were calculated from the diffraction peak of Mullite fired for 120 hours at each temperature．As the result，the △E of the Mullite formation at lO50℃ firing is found to be nearly equal zero},
 title = {粘土焼成における焼成時間効果 －焼成温度推定における留意点－},
 year = {1985}
}