Beiträge zur Untersuchung anorganischer nichtstöchiometrischer Verbindungen. XXXIII. Darstellung und elektronenmikroskopische Untersuchung von Hf2Nb20O54, M3Nb44O116 und MNb24O62 (M = Zr,Hf) |
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Authors: | F Dagefrde R Ross R Gruehn |
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Institution: | F. Dageförde,R. Ross,R. Gruehn |
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Abstract: | Contributions to the Investigation of Inorganic Non-stoichiometric Compounds. XXXIII. Preparation and Electron Microscopical Investigation of Hf2Nb20O54, M3Nb44O116, and MNb24O62 (M = Zr, Hf) The phases Hf2Nb20O54, Zr3Nb44O116, Hf3Nb44O116, and β-HfNb24O62 have been prepared for the first time. The oxides MO2 (M = Zr, Hf) and Nb2O5 were fused with (NH4)2SO4 and their mixed precipitations were heated at 1350°C. In the same way we also obtained pure β-ZrNb24O62. The new compounds have block structures, as the structure investigation with HRTEM shows. Hf2Nb20O54 is isostructural with Nb22O54, the same is valid for Zr3Nb44O116 and Hf3Nb44O116 with respect to Nb47O116. β-HfNb24O62 has the same structure as β-ZrNb24O62 and β-Nb25O62. |
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