Effect of Water Vapor on the Formation of Lithium cyclo-Hexaphosphate.
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概要
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The effect of water vapor on the formation of lithium <I>cyclo</I>-hexaphosphate Li<SUB>6</SUB>P<SUB>6</SUB>O<SUB>18</SUB>(P<SUB>6m</SUB>) from trilithium hydrogenpyrophosphate monohydrate Li<SUB>3</SUB>HP<SUB>2</SUB>O<SUB>7</SUB>·H<SUB>2</SUB>O was investigated by means of DTA-TG, X-ray diffraction analysis, isothermal heating with electric furnace, and HPLC. Li<SUB>3</SUB>HP<SUB>2</SUB>O<SUB>7</SUB>·H<SUB>2</SUB>O lost the water of crystallization at about 180°C to give anhydrous Li<SUB>3</SUB>HP<SUB>2</SUB>O<SUB>7</SUB>. At 300°C the disproportionation of Li<SUB>3</SUB>HP<SUB>2</SUB>O<SUB>7</SUB> anhydride to Li<SUB>4</SUB>P<SUB>2</SUB>O<SUB>7</SUB> and Li<SUB>4</SUB>P<SUB>4</SUB>O<SUB>12</SUB> (P<SUB>4m</SUB>) proceeded faster under humid conditions than under dry air, and subsequently P<SUB>4m</SUB> increased with a decrease in P<SUB>2</SUB> and soluble polyphosphates (P<SUB>poly</SUB>). At 400°C, P<SUB>4m</SUB> changed largely to P<SUB>6m</SUB> under humid conditions. In these reaction processes, water plays an important role as catalyst in the cyclization by dehydration of the end group and in ring opening by attacking the P–O–P bond. At 450°C, the amounts of P<SUB>2</SUB> and P<SUB>6m</SUB> were almost equal under both humid and dry conditions, because all of P<SUB>4m</SUB> thermally changed to P<SUB>6m</SUB>.
- 公益社団法人 日本化学会の論文
著者
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TSUHAKO Mitsutomo
Kobe Pharmaceutical University
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NARIAI Hiroyuki
Department of Chemical Science and Engineering, Faculty of Engineering, Kobe University
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MOTOOKA Itaru
Department of Chemical Science and Engineering, Faculty of Engineering, Kobe University
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Nariai Hiroyuki
Department of Chemistry, Faculty of General Education, Kobe University
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