박리화와 재적층법을 통한 K2La2Ti3O10부터 유전성 Bi4 − xLaxTi3O12(x~2)의 합성
Preparation of dielectric Bi4 − xLaxTi3O12 (x~2) from K2La2Ti3O10 via exfoliation and restacking routes
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초록
본 연구팀에서는 층상형 페로브스카이트 구조를 갖는 Ruddlesden-Popper 구조의 K2La2Ti3O10의 박리화를 통해Aurivillius 구조의 Bi4 − xLaxTi3O12(x~2) 페로브스카이트 산화물을 성공적으로 합성하였다. 박리화된 란타늄 티타네이트 나노시트는 BiOCl 나노결정구조와 반응시켜 Bi4 − xLaxTi3O12(x~2) 결정을 얻어내었다. 박리화된 나노시트 현탁액은 K2La2Ti3O10으로부터 수소화된 H2La2Ti3O10의 층간에 에틸아민을 삽입시킴으로써 얻어내었다. 투과전자현미경(TEM) 분석을 통해, 란타늄 티타네이트가 에틸아민에 의해 박리화된 것을 확인할 수 있었다. X-선 회절분석(XRD)을 통해, 박리화된 란타늄 티타네이트와 BiOCl의 재적층과정을 거쳐 700oC 이상의 열처리 조건에서 Bi4 − xLaxTi3O12(x~2)로 형성된 것을 확인할 수 있었다.
Abstract
We have successfully synthesized Bi4 − xLaxTi3O12 (x~2) having Aurivillius-type layered perovskite structure from exfoliated layered perovskite oxide of K2La2Ti3O10 with Ruddlesden-Popper structure. The reaction between the exfoliated lanthanum titanate nanosheets and BiOCl nanocrystal resulted in the formation of polycrystalline Bi4 − xLaxTi3O12 (x~2) after heating above 700oC. Colloidal suspension of the nanosheets could be obtained by intercalating ethylamine (EA) into the protonated lanthanum titanate, H2La2Ti3O10, derived from K2La2Ti3O10. Transmission electron microscopic (TEM) analysis show that the exfoliated lanthanium titanate nanosheets have a thickness of a few nano meters. According to X-ray diffraction (XRD) analysis, the exfoliated lanthanium titanate was found to be transformed into Bi4 − xLaxTi3O12 (x~2) after restacking with BiOCl and subsequent thermal treatment at > 700oC.
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