Jacob, K. T. ; Saji, V. S. ; Waseda, Y. (2006) Activity of TiO2 in the system ZrO2-TiO2 and Gibbs energy of formation of ZrTiO4 High Temperature Materials and Processes, 25 (4). pp. 203-208. ISSN 0334-6455
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Official URL: http://www.degruyter.com/view/j/htmp.2006.25.4/htm...
Related URL: http://dx.doi.org/10.1515/HTMP.2006.25.4.203
Abstract
The activity of Ti02 in single and two-phase regions of ihe system ZrOrTi02 has heen measured using solid state cells based on yttria-doped tho ria (YDT) as the solid electrolyte at 1373 K. The cells used can be represented as: Pt, Ti0.07 PtO.93+ Zr1-xTix02 / YDT / Ti02 + Ti0.07 Pt0.93, Pt Pt, Ti0.07 Pt0.93 + Zr1-xTix02 + ZrTi04 / YDT / Ti02+ Ti0.07 PtO.93, Pt In each cell the composition of Pt-Ti alloy was identical at hoth electrodes. The emf of the cell is therefore directly related to the activity of Ti02 in oxide phase or oxide phase mixture: aTiO2=exp (-4FE/RT). The activity coefficient of Ti02 in the zirconia-rich solid solution with monoclinic structure (0.02≥XTi02≥ 0) can be expressed as: In γTiO2=3.145(1-XTiO2)2-0.338 In the zirconia-rich solid solution with tetragonal structure (0.085≥XTiO2≥0.03), the activity coefficient is given by: In γTi02(± 0.012) = 2.354 (1-XTiO2)2 +0.064 The standard Gibbs energy of formation of ZrTi04 is -5650 (± 200) J/mol at 1373 K .
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to Walter de Gruyter GmbH & Co. KG. |
| ID Code: | 95042 |
| Deposited On: | 09 Nov 2012 06:28 |
| Last Modified: | 09 Nov 2012 06:28 |
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