Determination of the enthalpy of hydration of oxygen vacancies in Y-doped BaZrO(3) and BaCeo(3) by TG-DSC
Resource
SOLID STATE IONICS, 181(39-40), 1740-1745
Journal
Solid State Ionics
Pages
1740-1745
Date Issued
2010
Date
2010
Author(s)
Kjolseth, Christian
Wang, Lin-Yung
Haugsrud, Reidar
Norby, Truls
Abstract
Simultaneous thermogravimetry (TG) and differential scanning calorimetry (DSC), TG-DSC, have been applied for the first time to measure directly the standard molar enthalpy changes of a defect chemical reaction, here the hydration of oxygen vacancies in two proton conducting perovskite oxides, BaZr0.9Y0.1O3-δ (BZY10) and BaCe 0.9Y0.1O3-δ (BCY10). The measurements were done isothermally by parallel recording of the weight and heat exchanges associated with step changes in the water vapour pressure. The obtained molar hydration enthalpy of BZY10 was investigated at 300-900 °C and was found constant at-81 ± 4 kJ mol- 1 (per mole of H2O) over this range. The molar hydration enthalpy of BCY10 was investigated at 600 °C and found to be-170 ± 6 kJ mol- 1. Both values are in good agreement with the majority of literature data for the two materials obtained more indirectly by equilibrium methods. © 2010 Elsevier B.V. All rights reserved.
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journal article
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