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Title: | On the formation mechanism of BaTiO3–BaZrO3 solid solution through solid-oxide reaction |
Authors: | Bera, J Rout, S K |
Keywords: | perovskite ferroelectrics BaTiO3-BaZrO3 solid solution |
Issue Date: | Jan-2005 |
Publisher: | Elsevier |
Citation: | Materials Letters, Vol 59, Iss 1, P 135-138 |
Abstract: | The formation of solid solution composition BaTi0.6Zr0.4O3, from BaCO3, TiO2 and ZrO2 powders has been studied through solid-oxide reaction using TGA/DSC, XRD. BaCO3 decomposes at much lower temperature in the mixture due to the presence of TiO2. BaTiO3 and BaZrO3 start forming from the temperature range 700o-800oC without intermediate formation of BaO or other titanate/zirconate phases. Rate of BaTiO3 formation is higher than BaZrO3 formation due to the lower activation energy (34.3 kcal/mol) required for titanate formation than zirconate (48.4 kcal/mol). Solid solution then forms by diffusion of BaTiO3 into BaZrO3 from 1300oC onwards. Lattice parameter of initial SS-phase is higher, indicating the phase has a coherent interface with zirconate and higher in Zr-concentration than final product. Activation energy for the SS-formation (133 kcal/mole) indicates that Ba and/or O diffution through SS layer may limit the reaction. |
Description: | Copyright of this article belongs to Elsevier Science Ltd |
URI: | http://hdl.handle.net/2080/27 |
Appears in Collections: | Journal Articles |
Files in This Item:
File | Description | Size | Format | |
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BaTiO3-BaZrO3.pdf | 876.52 kB | Adobe PDF | View/Open |
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