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Pulsed Laser Deposition을 이용한 Zn<SUB>0.4</SUB>Fe<SUB>2.6</SUB>O₄ 박막의 합성과 그 결정성 및 자기적 특성의 연구
장안나(A. N. Jang),송종현(J. H. Song),박창엽(C. Y. Park) 한국자기학회 2011 韓國磁氣學會誌 Vol.21 No.3
We grew Zn<SUB>0.4</SUB>Fe<SUB>2.6</SUB>O₄ thin films using Pulsed Laser Deposition and studied their crystal structure and magnetical characteristics as a function of growth temperature (T<SUB>g</SUB>). For the film with T<SUB>g</SUB>=300 ℃, X-ray reflections from α-Fe₂O₃ and ZnO were observed. However, when T<SUB>g</SUB> was increased from 300 to 500 ℃, crystal structure of inverse spinel was stabilized with the crystal orientation of Zn<SUB>0.4</SUB>Fe<SUB>2.6</SUB>O₄(111)/Al₂O₃(0001) without any detection of α-Fe₂O₃ and ZnO phases. The surface morphology shows flattening behavior with increasing T<SUB>g</SUB> from 300 to 500 ℃. These observations indicate that Zn is substituted into tetrahedron A-site of the inverse-spinel Fe₃O₄. M-H curves exhibit clear ferromagnetism for the sample with T<SUB>g</SUB>=500 ℃ whereas no ferromagnetism is observed for the film with T<SUB>g</SUB>=300 ℃.
Pb(Zn,Mg,Nb)O₃-BT-PT계 세라믹스의 Grain 크기에 따른 파괴 인성 특성에 관한 연구
박창엽,이두희,유주현,정익채,박용욱 연세대학교 산업기술연구소 1991 논문집 Vol.23 No.2
In this study, ceramics in ?? system were fabricated with the variation of sintering time and temperature. The hardness, the fracture toughness and the structural properties with respect to the variation of the grain size were investigated for the purpose of micropositioner applications. From this, the grain size increased and the density decreased as the sintering temperature and time increased. As the grain size increased from 1.71 to 3.42(㎛), the hardness gradually decreased and the fracture toughness had the almost constant value, about 109(MPa).