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KMID : 1059519960400090607
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Journal of the Korean Chemical Society
1996 Volume.40 No. 9 p.607 ~ p.614
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Structural Changes and Dielectric Properties of Pb(Mg1/3Nb2/3)O3 Ceramics Substituted by Na+/La3+ Ions
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Hong Young-Sik
Park Hyu-Bum
Ahn Tae-Ho
Kim Si-Joong
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Abstract
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The structural changes and dielectric properties of Pb1-x(Na1/2La1/2)x(Mg1/3Nb2/3)O3 compounds substituted by 0∼50 mol.% of Na+/La3+ mixed ions were investigated by X-ray diffraction method, IR and Raman spectroscopy, and LCR meter. The amount of perovskite phase increased with the increases of Na+/La3+ substituents and sintering temperatures. Although the superlattice lines due to 1:1 ordering were not detected by X-ray diffraction method, it was found, from the Raman spectroscopy and the increase of diffuseness coefficient, that the ordering behavior was related to the decrease of A site ion size. Dielectric properties in Pb1-x(Na1/2La1/2)x(Mg1/3Nb2/3)O3 were affected by the amount of perovskite phase, grain size, and density. The phase transitions were broadened and phase transition temperatures were lowered by the increase of Na+/La3+ ions.
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