A novel crystal polymorph of volborthite,Cu3V2O7(OH)2·2H2O |
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| Authors: | Hajime Ishikawa,Jun‐ichi Yamaura,Yoshihiko Okamoto,Hiroyuki Yoshida,Gø ran J. Nilsen,Zenji Hiroi |
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| Abstract: | A new polymorph of volborthite [tricopper(II) divanadium(V) heptaoxide dihydroxide dihydrate], Cu3V2O7(OH)2·2H2O, has been discovered in a single crystal prepared by hydrothermal synthesis. X‐ray analysis reveals that the monoclinic structure has the space group C2/c at room temperature, which is different from that of the previously reported C2/m structure. Both structures have Cu3O6(OH)2 layers composed of edge‐sharing CuO4(OH)2 octahedra, with V2O7 pillars and water molecules between the layers. The Cu atoms occupy two and three independent crystallographic sites in the C2/m and C2/c structures, respectively, likely giving rise to different magnetic interactions between CuII spins in the kagome lattices embedded in the Cu3O6(OH)2 layers. |
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