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2006•FerroelectricsRequires access

Preparation of Pyrochlore-Free PMN by an Alternative Chemical Method

C. A. Guarany, R. N. Reis, E. B. Araújo, Carlyle Torres Bezerra de Menezes, A. G. Souza Filho, J. M. Sasaki, J. Mendes Filho

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Abstract

This work reports the synthesis of the MgNb2O6 and the ferroelectric lead magnesium niobate Pb(Mg1/3Nb2/ 3)O3 (PMN) using fine precursor powders obtained from a chemical Oxide Precursor Method (OPM). To obtain pyrochlore-free PMN ceramics, the synthesis of the precursor MgNb2O6 powders was studied for 2–25 mol% excess of MgO and 10 mol% excess of PbO. Structural and microstructural properties of the sintered ceramics obtained by the cited method and by the classical columbite method were studied and compared. Results lead to good quality pyrochlore-free PMN ceramic prepared by OPM, presenting greater grain size if compared with ceramic prepared by columbite method.

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What this paper is about

This work reports the synthesis of the MgNb2O6 and the ferroelectric lead magnesium niobate Pb(Mg1/3Nb2/ 3)O3 (PMN) using fine precursor powders obtained from a chemical Oxide Precursor Method (OPM). To obtain pyrochlore-free PMN ceramics, the synthesis of the precursor MgNb2O6 powders was studied for 2–25 mol% excess of MgO and 10 mol% excess of PbO. Structural and microstructural properties of the sintered ceramics obtained by the cited method and by the classical columbite method were studied and compared. Results lead to good quality pyrochlore-free PMN ceramic prepared by OPM, presenting greater grain size if compared with ceramic prepared by columbite method.

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Available abstract

This work reports the synthesis of the MgNb2O6 and the ferroelectric lead magnesium niobate Pb(Mg1/3Nb2/ 3)O3 (PMN) using fine precursor powders obtained from a chemical Oxide Precursor Method (OPM). To obtain pyrochlore-free PMN ceramics, the synthesis of the precursor MgNb2O6 powders was studied for 2–25 mol% excess of MgO and 10 mol% excess of PbO. Structural and microstructural properties of the sintered ceramics obtained by the cited method and by the classical columbite method were studied and compared. Results lead to good quality pyrochlore-free PMN ceramic prepared by OPM, presenting greater grain size if compared with ceramic prepared by columbite method.

Key concepts: Columbite, Pyrochlore, Materials science, Ceramic, Ferroelectricity, Chemical engineering, Lead oxide, Oxide

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