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Thermodynamic investigations on M2TeO6 (s) and M6TeO12 (s) (M = Gd, Er)

Authors
  • Jain, Ashish1
  • Pankajavalli, R.1
  • Anthonysamy, S.1
  • 1 Indira Gandhi Centre for Atomic Research, Chemistry Group, Kalpakkam, 603 102, India , Kalpakkam (India)
Type
Published Article
Journal
Journal of Thermal Analysis and Calorimetry
Publisher
Springer Netherlands
Publication Date
Jan 31, 2015
Volume
119
Issue
3
Pages
2093–2098
Identifiers
DOI: 10.1007/s10973-014-4344-8
Source
Springer Nature
Keywords
License
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Abstract

The standard Gibbs energies of formation of M2TeO6 (s) and M6TeO12 (s) (where M = Gd, Er) were obtained from vapour pressure measurements by employing thermogravimetry-based transpiration technique. The vapour pressures of TeO2 (g) over the mixtures M2TeO6 (s) + M6TeO12 (s) (where M = Gd, Er), generated by the incongruent vapourisation reaction, 3 M2TeO6 (s) → M6TeO12 (s) + 2 TeO2 (g) + O2 (g) were measured in the temperature range 1,373–1,483 K and 1,293–1,453 K to obtain Gibbs energies of formation of Gd2TeO6 (s) and Er2TeO6 (s), respectively. Similarly, the vapour pressures of TeO2 (g) over the mixtures M6TeO12 (s) + M2O3 (s) (where M = Gd, Er), generated by the incongruent vapourisation reaction, M6TeO12 (s) → 3 M2O3 (s) + TeO2 (g) + 1/2 O2 (g) were measured in the temperature range 1,673–1,773 K to determine the Gibbs energies of formation of Gd6TeO12 (s) and Er6TeO12 (s). From the vapour pressure measurements, the standard Gibbs energies of formation of M2TeO6 (s) and M6TeO12 (s) (where M: Gd, Er) were derived.

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