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Ideal and real structure of Ti5O4(PO4)(4): X-ray and HRTEM investigations - Part XX

机译:Ti5O4(PO4)(4)的理想和真实结构:X射线和HRTEM研究-第XX部分

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The crystal structure of pentatitanium tetraoxide tetrakis(phosphate), Ti5O4(PO4)(4), has been determined and refined from X-ray diffraction single-crystal data [P2(1)2(1)2(1) (No. 19), Z = 4, 12.8417 (12), b 14.4195 (13), c = 7.4622(9) A (from Guinier photographs); conventional residual R-1 = 0.012 for 2556 F-o > 4 sigma(F-o), R-1 = 0.057 for all 3276 independent reflections: 282 parameters; 29 atoms in the asymmetric unit of the ideal structure]. The structure is closely related to those of beta-Fe2O(PO4)-type phosphates and synthetic lipscombite, Fe-3(PO4)(4)(OH). While these consist of infinite chains of face-sharing MO6 octahedra, in pentatitanium tetraoxide tetrakis(phosphate) only five-eighths of the octahedral voids are occupied according to square 1(3)Ti(5)O(4)(PO4)(4). Four of the five independent Ti4+O6 show high radial distortion [1.72 less than or equal to d(Ti-O) less than or equal to 2.39 Angstrom] and a typical 1 + 4 + 1 distance distribution. The fifth Ti4+O6, is an almost regular octahedron [1.91 less than or equal to d(Ti-O) less than or equal to 1.98 Angstrom]. Partial disorder of Ti4+ over the available octahedral voids is revealed by the X-ray structure refinement. High-resolution transmission electron microscopy (HRTEM) investigations confirm this result. [References: 28]
机译:已从X射线衍射单晶数据[P2(1)2(1)2(1)(No.19)确定并精制了四氧化五钛四(磷酸盐)Ti5O4(PO4)(4)的晶体结构。 ),Z = 4,12.8417(12),b 14.4195(13),c = 7.4622(9)A(来自吉尼尔照片);对于2556 F-o> 4 sigma(F-o),常规残留R-1 = 0.012;对于所有3276个独立反射,R-1 = 0.057:282个参数;理想结构的不对称单元中包含29个原子]。该结构与β-Fe2O(PO4)型磷酸酯和合成脂酶Fe-3(PO4)(4)(OH)密切相关。虽然这些由无限面的共享MO6八面体链组成,但在四氧化五钛四(磷酸盐)中,根据平方1(3)Ti(5)O(4)(PO4)(4),仅占据八分之八的八面体空隙)。五个独立的Ti4 + O6中的四个显示出较高的径向变形[1.72小于或等于d(Ti-O)小于或等于2.39埃],并且具有典型的1 + 4 +1距离分布。第五个Ti4 + O6是几乎规则的八面体[1.91小于或等于d(Ti-O)小于或等于1.98埃]。 X射线结构的细化揭示了可用的八面体空隙中Ti4 +的部分无序。高分辨率透射电子显微镜(HRTEM)研究证实了这一结果。 [参考:28]

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