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Thermal behaviour of transition-and tetravalentmetal oxides and phosphorous oxide composites

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Abstract

The mixed zirconium, titanium, hafnium and first-row transition metal oxides (containing phosphorous oxide) were prepared using ion exchange method followed by calcinations at 1020 K during 12 h. The resulted mixed oxides were identified by XRPD method and studied their thermal behaviour by TG-DTA analysis. As a result of thermal analysis there were found one exothermic (with a peak at about 950 K), and one endothermic (with a peak at about 1300 K) processes, both without mass loss. The observation was valid for all investigated samples.

The analysis of XRPD patterns of the investigated samples showed well-defined crystal phases characteristic of each oxide. The XRPD analysis also verified the phase transition of tetravalent metal oxides from orthorhombic to tetragonal, observed by DTA analysis.

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Authors and Affiliations

  1. Institute of Isotopes of the Hungarian Academy of Sciences, P.O. Box 77, Budapest, 1525, Hungary

    L. Szirtes & J. Megyeri

  2. Laboratory of Nuclear Chemistry, Central Research Centre of the HAS, at Eötvös University, P.O. Box 32, Budapest, 1518, Hungary

    E. Kuzmann

Authors
  1. L. Szirtes
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  2. J. Megyeri
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  3. E. Kuzmann
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Correspondence to L. Szirtes.

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Szirtes, L., Megyeri, J. & Kuzmann, E. Thermal behaviour of transition-and tetravalentmetal oxides and phosphorous oxide composites. J Therm Anal Calorim 92, 649–653 (2008). https://doi.org/10.1007/s10973-007-8617-3

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