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. 2001 Dec 1;106(6):1097–1134. doi: 10.6028/jres.106.059

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The Journal of Research of the National Institute of Standards and Technology is a publication of the U.S. Government. The papers are in the public domain and are not subject to copyright in the United States. Articles from J Res may contain photographs or illustrations copyrighted by other commercial organizations or individuals that may not be used without obtaining prior approval from the holder of the copyright.

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Fig. 24 — Structures proposed for Ba₃Nb₂O₈; (A) from analysis of x-ray powder diffraction data [85], and (B) from single crystal study [75]. Large spheres represent Ba ions, smaller spheres are oxygens, and Nb ions occupy the polyhedra. The models are in agreement except that as found in (B), the [NbO₆] sites were empty and that all Nb ions occupy discrete tetrahedral sites.