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Synthesis, low temperature sintering and property enhancement of PMN-PT ceramics based on the dilatometric studies

Bhat, VV and Angadi, Basavaraj and Umarji, AM (2005) Synthesis, low temperature sintering and property enhancement of PMN-PT ceramics based on the dilatometric studies. In: Materials Science & Engineering, B, 116 (2). pp. 131-139.

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Abstract

A novel solid-state, single-step calcination route is adopted to synthesize pure perovskite phase of $PMN_{1-x}-PT_x$ (x = 0.0, 0.2 and 0.35) ceramics by utilizing the information obtained from dilatometry in association with thermal analysis and XRD studies. Using nitrate- and carbonate-based starting materials fine particles of reaction intermediates ($Pb_3Nb_2O_8$ type pyrochlores) are obtained in the temperature range of $600-700 ^oC$. Higher calcination temperatures lead to the formation of B-site rich pyrochlores ($Pb_3Nb_4O_{13}$ type pyrochlores), which is found to be detrimental for perovskite formation. The pyrochlore phase formed in-between $600 \hspace {2mm}and\hspace {2mm} 700 ^oC$ helps in achieving pure perovskite phase below $850 ^oC$ and bring down the sintering temperature to $\sim 1000 ^oC$. In this method the material is exposed to $> 900 ^oC$, only once during the entire processing, which is found to be beneficial in achieving better lead stoichiometry and the enhancement of the electronic properties. Ceramics of up to 93% theoretical density are investigated for their microstructure, dielectric and piezoelectric properties.

Item Type: Journal Article
Additional Information: The Copyright belongs to Elsevier.
Keywords: Lead magnesium niobate;Oxides;Thermal properties
Department/Centre: Division of Chemical Sciences > Materials Research Centre
Date Deposited: 28 Mar 2006
Last Modified: 19 Sep 2010 04:24
URI: http://eprints.iisc.ernet.in/id/eprint/5852

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