The Chemical Structures of Glasses of the NaPO<SUB>3</SUB>-Sb<SUB>2</SUB>O<SUB>3</SUB>-Na<SUB>2</SUB>O System
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概要
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Glassy and crystalline substances of the NaPO<SUB>3</SUB>-Sb<SUB>2</SUB>O<SUB>3</SUB>-Na<SUB>2</SUB>O system with P/Sb ratios in the range from 1.0 to 300 were prepared by heating NaPO<SUB>3</SUB>Sb<SUB>2</SUB>O<SUB>3</SUB>, and Na<SUB>2</SUB>CO<SUB>3</SUB> at 1000°C and by then quenching the melts of the mixtures. Samples with P/Sb ratios smaller than 5.0 were obtained as crystalline substances containing amorphous substances. The chemical compositions of these crystalline substances were estimated from the data obtained by X-ray diffractometry and paper chromatography. Samples with P/Sb ratios larger than 7.0 were obtained as glassy substances. Condensed phosphates were separated by paper-chromatographic analysis, and the average degree of the polymerization of the phosphates was measured by the pH-titration method. It has been found that the crystalline substances in the samples with P/Sb ratios in the range from 1.0 to 5.0 were Sb<SUB>2</SUB>O<SUB>5</SUB>, NaSbO<SUB>3</SUB>, and an unknown crystalline substance. Assuming that the glasses have the P-O-P, P-O<SUP>−</SUP>, P-O-Sb, and Sb-O<SUP>−</SUP> linkages, a theoretical treatment of the degree of polymerization of condensed phosphates has been made and compared with the experimental data. It has been concluded that the glasses with P/Sb ratios larger than 7.0 have P-O-P, P-O<SUP>−</SUP>, and P-O-Sb linkages.
- 公益社団法人 日本化学会の論文
著者
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Watanabe Makoto
Department of Analytical Chemistry of Medicines, Showa Pharmaceutical University
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Tanabe Kazuo
Department of Applied Chemistry
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Tanabe Kazuo
Department of Industrial Chemistry, Chubu Institute of Technology
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Yamada Tamotsu
Department of Industrial Chemistry, Chubu Institute of Technology
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Takahara Tomoyoshi
Department of Industrial Chemistry, Chubu Institute of Technology
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