TY - JOUR
T1 - Hexagonal tungsten trioxide obtained from peroxo-polytungstate and reversible lithium electro-intercalation into its framework
AU - Oi, Junko
AU - Kishimoto, Akira
AU - Kudo, Tetsuichi
AU - Hiratani, Masahiko
N1 - Funding Information:
Part of this work was supported by a Grant-in-Aid for Scientific Research on Priority Areas (402690205097) by the Ministry of Education, Science, and Culture, Japan.
PY - 1992/1
Y1 - 1992/1
N2 - A hexagonal form of WO3 (a = 7.3244(6), c = 7.6628(5), Å, z = 6) was synthesized by the low temperature sintering of an ammonium peroxo-polytungstate precursor. This compound, the N/W ratio of which is 0.015 at most, is not identical to reported hexagonal WO3 from WO3 ·1/3H2O because its c-axis is significantly shorter than that of the latter (7.798 Å). Powder, XRD profile refinements were performed in the space group P63/mcm. We found two kinds of structural models that showed reasonably good profile agreement (R0.07). Both models are built up of remarkably distorted WO6 octahedra, in which part of the O-O distances are very short (2.32 ≈ 2.42, Å). Electrochemical intercalation of lithium into the present WO3 framework was investigated using a Li|LiPF6|WO3 cell. It was found that Li was intercalated reversibly up to the composition Li1.0WO3.
AB - A hexagonal form of WO3 (a = 7.3244(6), c = 7.6628(5), Å, z = 6) was synthesized by the low temperature sintering of an ammonium peroxo-polytungstate precursor. This compound, the N/W ratio of which is 0.015 at most, is not identical to reported hexagonal WO3 from WO3 ·1/3H2O because its c-axis is significantly shorter than that of the latter (7.798 Å). Powder, XRD profile refinements were performed in the space group P63/mcm. We found two kinds of structural models that showed reasonably good profile agreement (R0.07). Both models are built up of remarkably distorted WO6 octahedra, in which part of the O-O distances are very short (2.32 ≈ 2.42, Å). Electrochemical intercalation of lithium into the present WO3 framework was investigated using a Li|LiPF6|WO3 cell. It was found that Li was intercalated reversibly up to the composition Li1.0WO3.
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U2 - 10.1016/S0022-4596(05)80292-0
DO - 10.1016/S0022-4596(05)80292-0
M3 - Article
AN - SCOPUS:0002494238
SN - 0022-4596
VL - 96
SP - 13
EP - 19
JO - Journal of Solid State Chemistry
JF - Journal of Solid State Chemistry
IS - 1
ER -