Activity of TiO2 in the System ZrO2-TiO2 and Gibbs Energy of Formation of ZrTiO4

Jacob, KT and Saji, VS and Waseda, Y (2006) Activity of TiO2 in the System ZrO2-TiO2 and Gibbs Energy of Formation of ZrTiO4. In: High Temperature Materials and Processes, 25 (4). pp. 203-208.

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Abstract

The activity of Ti02 in single and two··phase regions of ihe system ZrOrTi02 has heen measured lIsing 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, Tio.07PtO.Y3 + Zrj.,Tix0 2 / YDT / Ti02 + Tio.07Pto.93, Pt Pt, Tio.07Pto.93 + ZrJ.xTix02 + ZrTi04 / YDT / Ti02+ Tio.07PtO.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: aTiO~ :;: cxp (-4FE/RT). The activity coefficient of Ti02 in th~ zirconia-rich solid solution with monoclinic structure (CUl2 2" XTi02 2" 0) can be expressed as:In the zirconia-rich solid solution with tetragonal structure (0.085 2" X ri02 2" 0.03), the activity coefficient is given by:In YTi02 (± 0.012) = 2.354 (1-XTiO? )2 +0.064 The standard Gibbs energy of formation of ZrTi04 is -5650 (± 200) J/mol at 1373 K .

Item Type:	Journal Article
Publication:	High Temperature Materials and Processes
Publisher:	Walter de Gruyter GmbH & Co. KG
Additional Information:	Copyright of this article belongs to Walter de Gruyter GmbH & Co. KG.
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	29 Dec 2011 05:51
Last Modified:	29 Dec 2011 05:51
URI:	http://eprints.iisc.ac.in/id/eprint/42747

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