還元リン酸塩ガラスの執着色-退色のDTAによる検討

概要

論文の詳細を見る
Thermally induced coloring and bleaching in reduced phosphate glasses were investigated by means of DTA. As-quenched glasses prepared under reducing conditions are transparent and colorless. On reheating at around the softening temperature of the glasses they turn red ( "striking") . The struck glasses become almost transparent and colorless ( "bleaching") when they are heated above 580℃ and quenched subsequently. The resultant glasses (PTC-RP glass) exhibit red-coloring by reheating above 200℃ and/or light irradiation. It was explained in terms of transformation of colloidal phosphorus in the PTC-RP glasses that the endotherms at about 60° and 580℃ in the DTA curves are due to melting of white and red phosphorus, respectively, and that the exotherm at about 270℃ is due to transformation of liquid phosphorus to amorphous red phosphorus, i. e., to ring opening polymerization of P_4 molecules.
社団法人日本セラミックス協会の論文
1989-08-01