Structure and oxide ion conductivity in Bi28Re2O49, a new bismuth rhenium oxide containing tetrahedral and octahedral Re(VII)
Structure and oxide ion conductivity in Bi28Re2O49, a new bismuth rhenium oxide containing tetrahedral and octahedral Re(VII)
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Bi28Re2O49（一种含有四面体和八面体 Re(VII) 的新型氧化铼）的结构和氧化物离子电导率
DOI：
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
C. Greaves
中科院分区：
文献类型：
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作者：
T. Crumpton;J. Mosselmans;C. Greaves
合成并表征了一种新的 Bi-Re-O 相 Bi28Re2O49。通过中子粉末衍射测定其结构是立方萤石晶胞的超结构：四方晶系，I4/m，a
= 8.7216(1)
甲、丙
= 17.4177(2)
A. 该结构由连接的 BiO4e 三角双锥和四方锥（e = 孤对电子）组成的有序框架组成，在晶胞的原点和体中心具有离散的 Re 氧阴离子。红外光谱和 Re K 边 X 射线吸收光谱与比例为 3:1 的四面体 ReO4− 和八面体 ReO65− 物质的存在一致。这正确地提供了整体结构中的电荷平衡。发现该相显示出高氧化物离子电导率，这可能与两种不同含氧阴离子物种的存在以及 O2− 离子在它们之间可能的迁移有关。
A new Bi–Re–O phase, Bi28Re2O49, has been synthesized and characterized. Its structure, determined by neutron powder diffraction, is a superstructure of the cubic fluorite unit cell: tetragonal, I4/m, a
= 8.7216(1)
A, c
= 17.4177(2)
A. The structure comprises an ordered framework of linked BiO4e trigonal bipyramids and square pyramids (e = lone pair of electrons), with discrete Re oxoanions at the origin and body-centre of the unit cell. The infra-red spectrum and Re K-edge X-ray absorption spectrum were consistent with the presence of tetrahedral ReO4− and octahedral ReO65− species in the ratio of 3 : 1. This correctly provides charge balance in the overall structure. The phase is found to display high oxide ion conductivity, which may relate to the presence of the two different oxoanion species, and possible migration of O2− ions between them.