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Journal of the Korean Chemical Society (JKCS)

ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 40, Number 9
JKCSEZ 40(9)
June 20, 1996 

 
Title
Structural Changes and Dielectric Properties of Pb(Mg1/3Nb2/3)O3 Ceramics Substituted by Na+/La3+ Ions

Na+/La3+ 이온으로 치환된 Pb(Mg1/3Nb2/3)O3의 구조 변화 및 유전 성질
Author
Young-Sik Hong, Hyu-Bum Park, Tae-Ho Ahn, Si-Joong Kim

홍영식,박현범,안태호,김시중
Keywords
Abstract
ABO3계 perovskite 구조에서 A자리의 Pb2+ 이온이 Na+/La3+ 혼합 이온으로 0∼50 mol.% 치환된 Pb1-x(Na1/2La1/2)x(Mg1/3Nb2/3)O3 화합물의 구조변화와 유전 성질을 X-선 회절법, 적외선과 라만 분광법, LCR meter 등으로 연구하였다. Na+/La3+ 혼합 이온의 치환량과 소결 온도가 증가함에 따라 perovskite 상의 양이 증가하였다. 치환량이 증가할 때 1 : 1 질서화에 의한 초격자선을 X-선 회절법으로 발견할 수 없었지만, 라만 분광법과 이완성 매개변수의 증가로부터 A자리 양이온의 크기 감소가 질서화에 영향을 미침을 알 수 있었다. Pb1-x(Na1/2La1/2)x(Mg1/3Nb2/3)O3의 유전 성질은 perovskite 상의 양과 낟알 크기 및 밀도에 의해 영향을 받았고, 치환량이 증가할 때 상전이는 확산되었으며 상전이 온도는 감소하였다.

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.

Page
607 - 614
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