首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >The crystal structures of two new Ba borates: pentaborate hydrate, Ba[B_5O_8(OH)].H_2O, and decaborate, LiBa_2[B_(10)O_(16)(OH)_3]
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The crystal structures of two new Ba borates: pentaborate hydrate, Ba[B_5O_8(OH)].H_2O, and decaborate, LiBa_2[B_(10)O_(16)(OH)_3]

机译:两种新的硼酸钡的晶体结构:五硼酸盐水合物Ba [B_5O_8(OH)]。H_2O和十硼酸盐LiBa_2 [B_(10)O_(16)(OH)_3]

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摘要

Two new Ba borates, Ba[B_5O_8(OH)].H_2O (I) and LiBa_2[B_(10)O_(16)(OH)_3] (H), were synthesized in the hydrothermal systemsCs_2CO_3-Bao-B_2o_3-H_2o (T = 550 K, P = 100 bar, 20 days). The crystal structures of I and II were established from X-ray single crystal diffraction; I, space group P-1, a = 6.785(5), b = 6.831(5), c = 10.629(6) A, #alpha#= 100.07(4), #beta#= 91.98(6), #gamma#= 119.46(7) deg , V 417.01(58) A~3, R_(hki) = 0.069 for 1328Fo >4#sigma#(Fo); II, space group P-1, a = 6.732(1), b = 11.369(2), c = 11.581(2) A, #alpha#= 119.31(3), #beta#= 90.11(3), #gamma#= 73.08(3) deg, V 728.87(42) A , R_(hk1) = 0.048 for ll66Fo >=4#sigma# (Fo). The topology of the borate sheet of phase I is practically the same as that in the monoclinic structure of biringuccite, Na_2[B_5O_8(OH)].H_2O. The gaps between the sheets in synthetic Ba-biringuccite contain Ba atoms and water molecules. Phase H is characterized by a new boron sheet, formed by five crystallographically independent BO_4 tetrahedra and by five BO_3 triangles.
机译:在水热系统Cs_2CO_3-Bao-B_2o_3-H_2o( T = 550 K,P = 100 bar,20天)。 I和II的晶体结构由X射线单晶衍射确定; I,空间群P-1,a = 6.785(5),b = 6.831(5),c = 10.629(6)A,#alpha#= 100.07(4),#beta#= 91.98(6),#gamma对于1328Fo> 4#sigma#(Fo),#= 119.46(7)度,V 417.01(58)A〜3,R_(hki)= 0.069; II,空间群P-1,a = 6.732(1),b = 11.369(2),c = 11.581(2)A,#alpha#= 119.31(3),#beta#= 90.11(3),#gamma对于ll66Fo> = 4#sigma#(Fo),#= 73.08(3)度,V 728.87(42)A,R_(hk1)= 0.048。相I的硼酸盐片的拓扑实际上与双环丁二酸酯单斜结构Na_2 [B_5O_8(OH)]。H_2O中的拓扑相同。合成的Ba-双环丁二酸酯中的薄片之间的间隙包含Ba原子和水分子。 H相的特征是新的硼片,它由五个晶体学独立的BO_4四面体和五个BO_3三角形形成。

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