Ba4Mn2Ag2O(As04)4 , ein Barium-Mangan-Oxid-Arsenat mit nichtlinearen O-Ag-O-Hanteln / Ba4Mn2Ag2O(AsO4)4, a Barium Manganese Oxide-Arsenate Showing Nonlinear O-Ag-O Dumbbells
1998 ◽
Vol 53
(5-6)
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pp. 512-516
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Keyword(s):
X Ray
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Abstract Single crystals of Ba4Mn2Ag2O(AsO4)4 have been prepared by solid state reactions using metallic silver as reactant. X-ray techniques led to monoclinic symmetry, space group D2h-P2,/m, a = 8.739(2), b = 5.912(1), c = 9.440(2) Å, β = 115.21(1)°, Z = 1. The crystal structure is characterized by O-Ag-O dumbbells, bond angle = 165,3°, containing one oxygen atom not associated with the arsenate groups. Considering these facts Ba4Mn2Ag2O(AsO4)4 may be seen as an oxide-arsenate or an oxoargentate(I)-arsenate. Assuming the oxidation state +II for manganese, as confirmed by magnetic measurements, the compound has an oxygen deficite which was accounted for by a split position model.
1996 ◽
Vol 51
(4)
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pp. 489-492
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1998 ◽
Vol 53
(2)
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pp. 149-152
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1996 ◽
Vol 51
(2)
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pp. 229-232
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Keyword(s):
1997 ◽
Vol 52
(4)
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pp. 457-461
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Keyword(s):