The synthesis of Mg3(PO4)2 8H2O and its new polymorphism.
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概要
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Bobierrite, Mg<SUB>3</SUB>(PO<SUB>4</SUB>)<SUB>2</SUB>·8H<SUB>2</SUB>O, could be synthesized from mixed solutions of Na<SUB>2</SUB>HPO<SUB>4</SUB> and MgSO<SUB>4</SUB> at an initial pH of 6.4–7.0 with the addition of Ca(NO<SUB>3</SUB>)<SUB>2</SUB>, CuSO<SUB>4</SUB>, NiSO<SUB>4</SUB>, gelatin, or agar, by heating at 80–90 °C for 2–48 h. X-Ray studies indicated the coexistence of two kinds of lattice in each synthetic Mg<SUB>3</SUB>(PO<SUB>4</SUB>)<SUB>2</SUB>·8H<SUB>2</SUB>O crystal. One phase (Phase 1) is monoclinic, space group P2<SUB>1</SUB>/m or P2<SUB>1</SUB> with <I>a</I>=10.08(2), <I>b</I>=27.86(3), <I>c</I>=4.656(7) Å, and β=105.0(2)°. The other phase (Phase 2) is monoclinic, space group C2/m, C2, or Cm, with <I>a</I>=10.07(2), <I>b</I>=13.38(2), <I>c</I>=4.656(7) Å, and β=105.0(2)°. If a centrosymmetric space group C2/m is assumed for the latter, Phase 2 may be considered to be a new polymorph of Mg<SUB>3</SUB>(PO<SUB>4</SUB>)<SUB>2</SUB>·8H<SUB>2</SUB>O, one belonging to the vivianite series. Newberyite, MgHPO<SUB>4</SUB>·3H<SUB>2</SUB>O, was also formed in the above synthetic procedure. This phosphate was precipitated under slightly more acidic conditions than those where Mg<SUB>3</SUB>(PO<SUB>4</SUB>)<SUB>2</SUB>·8H<SUB>2</SUB>O was obtained.
- 公益社団法人 日本化学会の論文
著者
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Umegaki Takao
Department Of Applied Chemistry Graduate School Of Engineering Tokyo Metropolitan University
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Shimizu Masao
Department Of Applied Physics Faculty Of Engineering Nagoya University
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Kanazawa Takafumi
Department of Industrial Chemistry, Faculty of Technology, Tokyo Metropolitan University
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Shimizu Masao
Department of Industrial Chemistry, Faculty of Technology, Tokyo Metropolitan University
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