Synthesis, crystal structure, and structural conversion of Ni molybdate hydrate NiMoO4·nH2O |
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| Authors: | Kazuo Eda Yasuyuki Kato Takamitu Sugitani |
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| Institution: | a Department of Chemistry, Graduate School of Science, Kobe University, Nada-ku, Kobe 657-8501, Japan
b Institute for Materials Research, State University of New York at Binghamton, Binghamton, NY 13902-6000, USA |
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| Abstract: | The synthesis and crystal structure of NiMoO4·nH2O were investigated. The hydrate crystallized in the triclinic system with space group P−1, Z=4 with unit cell parameters of a=6.7791(2) Å, b=6.8900(2) Å, c=9.2486(2) Å, α=76.681(2)°, β=83.960(2)°, γ=74.218(2)°. Its ideal chemical composition was NiMoO4·3/4H2O rather than NiMoO4·1H2O. Under hydrothermal conditions the hydrate turned directly into α-NiMoO4 above 483 K, giving nanorods thinner than the crystallites of the mother hydrate. On the other hand, it turned into Anderson type of polyoxomolybdate via a solid-solution process in a molybdate solution at room temperature. |
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| Keywords: | Ni molybdate hydrate Crystal structure Structural conversion Hydrothermal synthesis |
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