Journal article

Publication year: 1991

Pages: 279-292

Journal: Journal of Inorganic and General Chemistry

Volume number: 598

Issue number: 7-8

ISSN: 0044-2313

DOI Link: https://doi.org/10.1002/zaac.19915980125

Publisher: Wiley

Abstract: 
The new ternary oxides alpha-HfNb24O62 and HfNb52O132 were obtained by oxidizing corresponding mixtures of HfO2/NbO2 and subsequent heating at 1150-degrees-C, a temperature which is unusually low for reactions in this system. In contrast, alpha-ZrNb24O62 could not be obtained in this way. Instead, samples with a certain amount of this compound were synthesized in a manner described previously, but they always contained considerable amounts of the beta-modification, too. HRTEM-investigations showed all compounds, mentioned above, to have block structures. The ideal structure of HfNb52O132 corresponds to the wellknown NbO(x)-phase Nb53O132; alpha-ZrNb24O62 and alpha-HfNb24O62 are isostructural to Nb25O62. Additionally, there exist corresponding relationships to TiNb52O132 and TiNb24O62. Samples with a starting composition of ZrO2/NbO2 = 1:24 were microheterogenous and contained large amounts of the hybrid phase ZrNb38O97.

Harvard Citation style: ROSS, R., DAGEFORDE, F. and GRUEHN, R. (1991) CONTRIBUTIONS TO THE INVESTIGATION OF INORGANIC NONSTOICHIOMETRIC COMPOUNDS .42. PREPARATION AND ELECTRON-MICROSCOPIC INVESTIGATION OF ALPHA-MNB24O62 AND MNB52O132 (M = ZR, HF), Zeitschrift für anorganische und allgemeine Chemie = Journal of Inorganic and General Chemistry, 598(7-8), pp. 279-292. https://doi.org/10.1002/zaac.19915980125

APA Citation style: ROSS, R., DAGEFORDE, F., & GRUEHN, R. (1991). CONTRIBUTIONS TO THE INVESTIGATION OF INORGANIC NONSTOICHIOMETRIC COMPOUNDS .42. PREPARATION AND ELECTRON-MICROSCOPIC INVESTIGATION OF ALPHA-MNB24O62 AND MNB52O132 (M = ZR, HF). Zeitschrift für anorganische und allgemeine Chemie = Journal of Inorganic and General Chemistry. 598(7-8), 279-292. https://doi.org/10.1002/zaac.19915980125