화학공학소재연구정보센터
Korean Journal of Materials Research, Vol.13, No.12, 846-849, December, 2003
비스무스 층구조형 페로브스카이트 SrBi 2 Nb 2 O 9 강유전체의 이온 치환 효과
Ionic Doping Effect in Bi-layered Perovskite SrBi 2 Nb 2 O 9 Ferroelectrics
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Doping effect of various ions in Bi-layered ferroelectric SrBi 2 Nb 2 O 9 (SBN) ceramics was studied. Undoped SBN ceramic and SBN ceramics doped with Ba 2+ , Pb 2+ , Ca 2+ , Bi 3+ , La 3+ , Ti 4+ , Mo 6+ , and W 6+ ions were made by a solid state reaction. Dielectric constants were measured with temperature. Ferroelectric transition temperature decreased with Pb 2+ , Ba 2+ , La 3+ doping, but the transition temperature increased with Ca 2+ , Bi 3+ , Ti 4+ , Mo 6+ , or W 6+ ionic doping. These results show that the ion size plays an important role in the ferroelectricity of SBN ceramic.
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