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Effects of Starting Precursor on Phase and Microstructural Characteristics of Ferroelectric Lead Magnesium Niobate Ceramics
Paper Type  |
Contributed Paper |
Title |
Effects of Starting Precursor on Phase and Microstructural Characteristics of Ferroelectric Lead Magnesium Niobate Ceramics |
Author |
Suk anda Jiansirisomboon *, K amonpan P engpat and T awee T unk asiri |
Email |
sukanda@chiangmai.ac.th |
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Abstract: Ferroelectric lead magnesium niobate (Pb(Mg1/3Nb2/3)O3; PMN) ceramics were fabricated from different starting precursors using a columbite method. To receive high quality PMN powders, an optimization for high purity magnesium niobate (MgNb2O6; MN) powders was crucial. The MN powders were prepared using a mixed-oxide method from 2 groups of precursors. Group 1 (MN1) consisted of MgO and Nb2O5, while (MgCO3)4 Mg(OH)2.5H2O. was used instead of MgO in group 2 (MN2). It was found that calcination temperature of MN powder could be reduced by approximately 200°C when (MgCO3)4 Mg(OH)2.5H2O. was used instead of MgO as a base precursor. Both MN powders then reacted with PbO to form the PMN1 and PMN2 powders. At this stage, a pyrochlore second phase always formed with a main perovskite PMN phase. Microstructural investigation of the PMN ceramics showed well-dispersed large pyramidal pyrochlore grains among the PMN grains. Grain size of PMN1 ceramics were larger than those found in PMN2 ceramics.
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Start & End Page |
307 - 313 |
Received Date |
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Revised Date |
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Accepted Date |
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Full Text |
Download |
Keyword |
Columbite method, Grain size, Pb(Mg1/3Nb2/3)O3, Precursor |
Volume |
Vol.32 No.3 (SEPTEMBER 2005) |
DOI |
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SDGs |
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