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다결정 및 박막형 $Sr_2Nb_2O_7$의 입자배향과 전기적특성
손창헌,전상재,남효덕,이희영 한국전기전자재료학회 1998 전기전자재료학회논문지 Vol.11 No.4
Polycrystalline $Sr_2Nb_2O_7$ ceramics with very high Curie temperature were sintered using the powder derived by the chemical coprecipitation method (CCP). The phase evolution and grain-orientation of sintered samples were examined by XRD, while sintering behavior, dielectric properties and polarization were studied by SEM and ferroelectric tester. Extremely high degree of grain-orientation was observed along the (0k0) direction, which resulted in anisotropic dielectric properties of the sintered samples, with the dielectric constant values approaching those for single crystal. Thin film fabrication of $Sr_2Nb_2O_7$ in the pyroniobate family was also attempted on $SiO_2$/Si(100), Pt/$SiO_2$/Si(100), Pt/Ti/$SiO_2$/Si(100) and Pt/$ZrO_2/SiO_2/Si_2(100)$ substrates, using metalorganic decomposition (MOD) process. Neodecanoate precursor solution was prepared by mixing strontium neodecanoate with niobium neodecanoate synthesized from niobium ethoxide. It was found that $Sr_2Nb_2O_7$ single phase appeared in XRD patterns the samples annealed above $950^{\circ}C$. The effect of substrate type on film microstructure and dielectric properties was observed.
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$A_2B_2O_7$계를 중심으로 한 고온용 압전체의 개발동향
남효덕 한국전기전자재료학회 1996 電氣電子材料學會誌 Vol.9 No.4
본 고에서는 고온센서용 압전체가 필요하고 실용화할 수 있는 다결정 압전세라믹스 및 박막재료가 요구되는 점을 감안하여 고온에서도 사용할 수 있는 단결정 $A_{2}$B$_{2}$O$_{2}$형의 성장과 그 전기적 특성 및 최근 개발을 시도하고 있는 다결정 $A_{2}$B$_{2}$O$_{2}$형 압전체에 대한 지금까지의 개발동향을 문헌소개와 함께 필자의 연구결과 일부도 보고하며 아울러 박막화의 가능성도 제시하고자 한다.
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이상민 ( Sang-min Lee ),이상혜 ( Sang-hye Lee ),강동수 ( Dong-su Kang ),노재승 ( Jae-seung Roh ) 한국복합재료학회 2021 Composites research Vol.34 No.1
석탄 핏치의 전구체인 콜타르를 바인더 및 함침재로 이용하여 벌크흑연을 제조할 수 있는 가능성을 검토하고자 하였다. 충전재로 천연흑연을 이용하였으며, 천연흑연과 콜타르를 혼합 및 성형한 후 탄화 열처리를 실시하였다. 탄화 열처리 후 함침-재탄화를 5회 실시하여 밀도, 기공율, 압축강도, 그리고 이방성비를 측정하였다. 탄화체의 최고 밀도는 1.76 g/cm<sup>3</sup>였고, 기공율은 최소 15.6%로써 공정 제어에 의해 조절이 가능하였다. 압축강도는 최고 20.3 MPa이 얻어졌다. 탄화체의 이방비는 최대 0.34로써 강한 이방성 탄화체를 얻을 수 있었다. 따라서 콜타르를 바인더 및 함침재로 이용하여 벌크 형태의 인조흑연 제조가 가능하다는 것을 확인하였다. 또한 탄화체의 이방성을 조절하여 전기적, 기계적 방향 특성을 조절한다면 적절한 재료 설계를 통하여 다양한 분야에 응용할 수 있을 것이라 판단된다. This paper studied the possibility of manufacturing bulk graphite using coal tar, a precursor of coal tar pitch, as a binder and impregnant. Carbonization was conducted after mixing and molding with natural graphite as a filler and coal tar as a binder. Impregnation-recarbonization was performed five times after carbonization. Coal tar used as impregnant. Measuring density, porosity, compressive strength, and anisotropy ratio was conducted. The maximum density of bulk graphite specimen was 1.76 g/cm<sup>3</sup> and the minimum porosity was 15.6% which could be controlled by process control. The highest compressive strength was 20.3MPa. Then the maximum anisotropic ratio of bulk was shown 0.34 through XRD analysis. Therefore, it was confirmed that it was possible to manufacture artificial graphite in a bulk form by using coal tar as a binder and an impregnant.
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용융염합성법에 의한 $Sr_2(Ta_{1-x}Nb_x)_2O_7$ 세라믹스의 저온소성과 유전특성
남효덕 한국전기전자재료학회 1995 電氣電子材料學會誌 Vol.8 No.2
Solid solutions Sr$_{2}$(Ta$_{1-x}$ Nb$_{x}$)$_{2}$O$_{7}$, (x=0.0-1.0), composed of strontium tantalate(Tc=-107.deg. C) and strontium-niobate(Tc=1342.deg. C) were prepared by the conventional mixed oxide method and the flux method(molten salt synthesis method). Phase relation, sintering temperature, grain-orientation and dielectric properties for sintered ceramic samples were investigated with different compositions. Both Curie temperature and dielectric constant at Curie temperature were increased, and sintering behavior and the degree of grain-orientation were improved with the increase of Nb content. The single phase Sr$_{2}$(Ta/sib 1-x/Nb$_{x}$)$_{2}$O$_{7}$ powder was synthesized by using the flux method at lower temperatures, and sintering temperature was also reduced by using the flux method-derived powder than using the mixed oxide-derived powder. Sintering characteristics and dielectric properties of the specimens prepared by the flux method were better than those derived through the conventional mixed oxide method.thod.hod.
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