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爱与雨下: 金币+4 2012-04-18 19:24:29
爱与雨下: , 欢迎常来~！ 2012-04-18 19:24:43
budong0915: 金币+20, 翻译EPI+1, ★有帮助 2012-04-19 02:42:46
budong0915: 金币+60 2012-04-25 11:17:35
The research synthesizes two new alkali metal borate compounds by boric acid melting method. All of the compounds are tested by single crystal diffractometer in structure and characterized by XRD, infrared spectrum and thermogravimetric analysis(TGA).
Here are the two alkali metal borate compounds:
（i）NaZnB3P2O10(OH)2•1.17H2O
（ii）RbB5O7(OH)2•H2O
Alkali metal boron phosphate (NaZnB3P2O10(OH)2•1.17H2O) belongs to hexagonal system with a space group of P6(3)/m whose lattice parameters is: a=1.17272(3)nm, c=1.21317(6)nm, γ=120°, V=1.44491(10) nm3, Z=6，R1=0.0679, wR2=0.1566. The compound contains a twelve-membered ring tunnel of hole with six BO4 tetrahedrons and six PO4 tetrahedrons and a six-membered ring tunnel of hole with three ZnO6 octahedrons and three PO4 tetrahedrons which is filled with H2O. What’s more, the structure also contains a ZnP2O10 layer with ZnO6 octahedron and PO4 tetrahedron and a NaB3O10 layer with NaO6 octahedron and B3O6(OH)2 group in the order of ABAB forming up a new 3-dimensional framework.
Alkali metal 5-borate (RbB5O7(OH)2•H2) belongs to monoclinic system with a space group of P2/n whose lattice parameters is: a=0.7640(2)nm, b=0.9019(3)nm, c=1.0833(3)nm, β=103.681(5)°, V=0.7252(4) nm3, Z=2, Rl=0.0737, wR2=0.1588. There are two different boron-oxygen polyanions ([B5O7(OH)2]-) in it. The basic structure unit is a two-membered ring of boron- oxygen consisting of a BO4 tetrahedron and 4 BO3 triangles forming an infinite chain of Z by the combination of atom O1 alternately. Then the chain of Z forms a 3-dimensional framework with ion Rb+ through oxygen atom.
The boric acid melting method mentioned in this article is very simple for the import of boron which has been applied into the manufacture of cathode material in lithium battery. The mentioned alkali metal boron phosphate with twelve-membered ring and six-membered ring and 3-dimensional alkali metal 5-borate with chain of Z become an innovation for borate and lay the foundation for the discovery of multi-function materials.
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