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Crystal Structure of the Compound Bi2Zn2/3Nb4/3O7



Igor Levin, T G. Amos, J Nino, Terrell A. Vanderah, I Reaney, C A. Randall, M T. Lanagan


The crystal structure of Bi2Zn2/3Nb4/3O7 was determined using a combination of electron, X-ray and neutron powder diffraction. The compound crystallizes with a monoclinic zirconolite-like structure (C2/c (No.15) space group, a=13.1037(9) , b=7.6735(3) , c=12.1584(6) , =101.318(5) ). According to structural refinements using neutron diffraction data, Nb preferentially occupies six-fold coordinated sites in octahedral sheets parallel to the (001) planes, while Zn is statistically distributed between two half-occupied (5+1)-fold coordinated sites near the centers of six-membered rings of [Nb(Zn)O6] octahedra. The Nb/Zn cation layers alternate along the c=axis with Bi-layers, in which Bi cations occupy both eight- and seven-fold coordinated sites. The eight-fold coordinated Bi atoms exhibited strongly anisotropic thermal displacements with an abnormally large component directed approximately along the c-axis (normal to the octahedral layers).
Journal of Materials Research
No. 6


bismuth zinc nobate, electron diffraction, microwave dielectric, neutron diffraction, pyrochlore, zirconolite


Levin, I. , Amos, T. , Nino, J. , Vanderah, T. , Reaney, I. , Randall, C. and Lanagan, M. (2002), Crystal Structure of the Compound Bi<sub>2</sub>Zn<sub>2/3</sub>Nb<sub>4/3</sub>O<sub>7</sub>, Journal of Materials Research (Accessed February 23, 2024)
Created June 1, 2002, Updated February 19, 2017