npsm 새물리 New Physics : Sae Mulli

pISSN 0374-4914 eISSN 2289-0041
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Article

Research Paper

New Physics: Sae Mulli 2011; 61: 446-450

Published online April 30, 2011 https://doi.org/10.3938/NPSM.61.446

Copyright © New Physics: Sae Mulli.

Dielectric and Optical Properties of Mg Doped Zn1-xMgxO Ceramics

S. B. KIM, B. C. CHOI*

Department of Physics, Pukyong National University, Busan 608-737

Correspondence to:bcchoi@pknu.ac.kr

Abstract

Zn1-xMgxO (x = 0.02, 0.04, 0.06, 0.08, 0.1, 0.2) ceramics were synthesized using the traditional solid state reaction method. The dielectric and the optical properties of the ceramics with various Mg contents were investigated. The X-ray diffraction profile showed a wurtzite structure, and the particle size decreased as the Mg content was increased. Furthermore, the Zn1-xMgxO ceramics showed a more then 60% higher optical transparency in the visible region, and an absorption edge shift was abserved at short wave lengths, indicating a band-gap expansion. From the dielectric properties of the Zn1-xMgxO ceramics, we found that the phase transition temperature and the dielectric constant decreased with increasing Mg content.

Keywords: ZnO, Band gap, Dielectric property

고상반응법을 사용하여 Zn1-xMgxO(x = 0.02, 0.04, 0.06, 0.08, 0.1, 0.2) 세라믹을 제작하고 Mg 첨가량에 따른 각 세라믹의 유전적, 광학적 특성을 조사하였다. X-ray diffraction 측정 결과 Zn1-xMgxO 세라믹이 wurtzite 구조를 가지고 있음을 확인할 수 있었으며, Mg 함량이 증가할수록 입자의 크기는 감소하였다. 각 세라믹의 투과율 측정에서는 가시광 영역에서 모두 60 %이상의 투과율을 보였고 Mg의 양이 증가함에 따라 흡수단이 단파장으로 이동하며 밴드 갭 에너지가 증가하였다. Zn1-xMgxO 세라믹의 유전특성은 Mg 첨가량의 증가에 따라 상전이 온도와 유전상수가 감소함을 관찰하였다.

Keywords: ZnO, 밴드 갭, 유전특성

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