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Interaction between $Ni/NiO$ and $PbTiO_3$: Phase Reversal with Redox Switching

Jacob, KT and Saji, VS (2006) Interaction between $Ni/NiO$ and $PbTiO_3$: Phase Reversal with Redox Switching. In: Journal of Phase Equilibria & Diffusion, 27 (5). pp. 456-461.

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Abstract

In some applications it is useful to have $Pb(Zr,Ti)O_3$ (PZT) films printed and fired on metallic substrates because of low cost, ease of handling, and mechanical flexibility of the substrate. As part of the systematic studies on phase compatibility of metallic substrates with PZT ceramics, studies have been conducted on the interaction between Ni and $PbTiO_3$ under oxidizing and neutral conditions at 1123 K. Phase relations in the pseudoternary system $NiO-PbO-TiO_2$ and quaternary $Ni-Pb-NiTiO_3-PbTiO_3$ were explored by equilibrating compacted mixtures of component oxides and/or metals in air and prepurified Ar gas. The equilibrium phases were identified by x-ray diffraction and energy dispersive spectroscopy. The results suggest that NiO is phase compatible with $PbTiO_3$. When nickel surface is oxidized, NiO is in direct contact with $PbTiO_3$ and there is no displacement reaction between NiO and $PbTiO_3$. However, in neutral and reducing conditions metallic Ni reacts with $PbTiO_3$ to form $NiTiO_3$ and a lead-rich alloy, with catastrophic consequences in device applications. The results are rationalized using a thermodynamic analysis. The nature of phase relations in the system $Ni-Pb-Zr-O$ is elucidated using thermodynamic data.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to ASM International.
Keywords: Displacement Reaction;Metal/Ceramic Interaction;Nio-Pbo-Tio2 System;Ni-Pb-Nitio3-Pbtio3 System;Phase Diagram
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited: 27 May 2008
Last Modified: 27 Aug 2008 13:23
URI: http://eprints.iisc.ernet.in/id/eprint/14055

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