Crystal Structure of a New Polymorphic Modification of Niahite, NH4MnPO4 • H2O
Crystal Structure of a New Polymorphic Modification of Niahite, NH4MnPO4 • H2O
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DOI：
10.1134/s106377451502011x
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发表时间：
2015-03-01
影响因子：
0.7
通讯作者：
Dimitrova, O. V.
中科院分区：
文献类型：
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作者：
Kiriukhina, G. V.;Yakubovich, O. V.;Dimitrova, O. V.
用X射线衍射法测定了在Mn_2O_3-（NH_4）（3）PO_4-H_2O体系中以单晶形式获得的一种新的菱锌矿矿物NH_4MnPO_4中心点H_2O的晶体结构（Xcalibur-S-CCD衍射仪，R = 0.0259）：a = 17.582，B = 4.909，和c = 5.731 ;空间群D-2 h（16）= Pnam，Z = 4，D-x = 2.497 g/cm（3）。结果表明，新化合物是一个多晶型的改性niahite;它具有层状结构，这不同于矿物的结构的存在下的中心的反转和加倍的晶胞参数。建议考虑的矿物和合成的类似物的niahite和triphylite集团的成员，共同的多体系列。
The crystal structure of a new modification of the niahite mineral NH4MnPO4 center dot H2O, obtained in the form of single crystals under hydrothermal conditions in the Mn2O3-(NH4)(3)PO4-H2O system, is determined by X-ray diffraction (Xcalibur-S-CCD diffractometer, R = 0.0259): a = 17.582, b = 4.909, and c = 5.731 ; space group D-2h(16) = Pnam, Z = 4, D-x = 2.497 g/cm(3). It is shown that the new compound is a polymorphic modification of niahite; it has a layered structure, which differs from the structure of the mineral by the presence of the center of inversion and the doubled a unit cell parameter. It is proposed to consider the minerals and synthetic analogues of the niahite and triphylite groups as members of the common polysomatic series.