An outline of the crystal-structure of Bi2Mo2O9

A.F. van den Elzen; G.D. Rieck

doi:10.1016/0025-5408(75)90021-5

An outline of the crystal-structure of Bi₂Mo₂O₉

A.F. van den Elzen, G.D. Rieck

Chemical Engineering and Chemistry

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Abstract

An outline of the structure of the catalyser component Bi₂Mo₂O₉ has been determined from X-ray powder diffractometer diagrams. The space group is P² l n (= P² l c) with cell constants: a = 11.946 (2) A ̊, b = 10.795 (2) A ̊, c = 11.876 (2) A ̊ and β = 90.15 (2)°. There are eight formula units per cell. The positions of the metal-ions could directly be derived from the intensities of the strongest reflexions. With difference terms calculated from 19 strong reflexions a Δ F-synthesis was calculated, which revealed the approximate positions of the O^2--ions. From packing considerations it was apparent that of 9 0^2--ions one is only coordinated by Bi³⁺ and that Mo⁶⁺ must be tetrahedrally surrounded by 0^2-. These tetrahedra may be strongly distorted. The structure is not related to the scheelite-structure as has been assumed by some authors.

Original language	English
Pages (from-to)	1163-1168
Number of pages	6
Journal	Materials Research Bulletin
Volume	10
Issue number	11
DOIs	https://doi.org/10.1016/0025-5408(75)90021-5
Publication status	Published - Nov 1975

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title = "An outline of the crystal-structure of Bi2Mo2O9",

abstract = "An outline of the structure of the catalyser component Bi2Mo2O9 has been determined from X-ray powder diffractometer diagrams. The space group is P2 l n (= P2 l c) with cell constants: a = 11.946 (2) A ̊, b = 10.795 (2) A ̊, c = 11.876 (2) A ̊ and β = 90.15 (2)°. There are eight formula units per cell. The positions of the metal-ions could directly be derived from the intensities of the strongest reflexions. With difference terms calculated from 19 strong reflexions a Δ F-synthesis was calculated, which revealed the approximate positions of the O2--ions. From packing considerations it was apparent that of 9 02--ions one is only coordinated by Bi3+ and that Mo6+ must be tetrahedrally surrounded by 02-. These tetrahedra may be strongly distorted. The structure is not related to the scheelite-structure as has been assumed by some authors.",

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T1 - An outline of the crystal-structure of Bi2Mo2O9

AU - van den Elzen, A.F.

AU - Rieck, G.D.

PY - 1975/11

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N2 - An outline of the structure of the catalyser component Bi2Mo2O9 has been determined from X-ray powder diffractometer diagrams. The space group is P2 l n (= P2 l c) with cell constants: a = 11.946 (2) A ̊, b = 10.795 (2) A ̊, c = 11.876 (2) A ̊ and β = 90.15 (2)°. There are eight formula units per cell. The positions of the metal-ions could directly be derived from the intensities of the strongest reflexions. With difference terms calculated from 19 strong reflexions a Δ F-synthesis was calculated, which revealed the approximate positions of the O2--ions. From packing considerations it was apparent that of 9 02--ions one is only coordinated by Bi3+ and that Mo6+ must be tetrahedrally surrounded by 02-. These tetrahedra may be strongly distorted. The structure is not related to the scheelite-structure as has been assumed by some authors.

AB - An outline of the structure of the catalyser component Bi2Mo2O9 has been determined from X-ray powder diffractometer diagrams. The space group is P2 l n (= P2 l c) with cell constants: a = 11.946 (2) A ̊, b = 10.795 (2) A ̊, c = 11.876 (2) A ̊ and β = 90.15 (2)°. There are eight formula units per cell. The positions of the metal-ions could directly be derived from the intensities of the strongest reflexions. With difference terms calculated from 19 strong reflexions a Δ F-synthesis was calculated, which revealed the approximate positions of the O2--ions. From packing considerations it was apparent that of 9 02--ions one is only coordinated by Bi3+ and that Mo6+ must be tetrahedrally surrounded by 02-. These tetrahedra may be strongly distorted. The structure is not related to the scheelite-structure as has been assumed by some authors.

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An outline of the crystal-structure of Bi₂Mo₂O₉

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