Thermal Behavior of Alkaline-Earth Metal cyclo-Tetraphosphates.
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概要
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The effect of water vapor on the thermal behavior of alkaline-earth metal <I>cyclo</I>-tetraphosphates, M<SUB>2</SUB>P<SUB>4</SUB>O<SUB>12</SUB>·<I>n</I>H<SUB>2</SUB>O (<I>n</I>=7.0, 3.5, 5.5, and 4.0 for M=Mg, Ca, Sr, and Ba, respectively) (P<SUB>4m</SUB>) was examined using DTA-TG, X-ray diffraction analysis, isothermal heating in an electric furnace, and HPLC-FIA. The calcination reaction of each P<SUB>4m</SUB> proceeded via ring opening of P<SUB>4m</SUB> with elimination of water of crystallization, followed by condensation of soluble oligophosphates (P<SUB>oligo</SUB>) to insoluble polyphosphates (P<SUB>high poly</SUB>). The rates of these reactions were faster for Mg<SUB>2</SUB>P<SUB>4m</SUB> than for other metal <I>cyclo</I>-phosphates. The decomposition of P<SUB>4m</SUB> was appreciably faster in humid air than in dry air, because of the availability of water for hydrolysis and for breaking the P–O–P linkage. However, the effect of water vapor from the atmosphere was not conspicuous, since the atmosphere contains enough water (theor. 20 mg L<SUP>−1</SUP>) for the hydrolysis of P<SUB>4m</SUB>. The products of calcination of Ba<SUB>2</SUB>P<SUB>4m</SUB>·4H<SUB>2</SUB>O were hardly influenced by water vapor from the atmosphere, because the water of crystallization was not easily released in the Ba system compared with the other metal salts.
- 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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Kanaji Yukio
Department Of Industrial Chemistry Faculty Of Engeneering Kobe University
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Kanaji Yukio
Department of Industrial Chemistry, Faculty of Engineering, Kobe University
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