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친환경 비납계 Sodium potassium niobate 압전세라믹스의 조성 최적화
姜東憲 水原大學校 2012 論文集 Vol.26 No.-
Lead-free piezoelectric [(Na0.5K0.5)1-x(A)x][(Nb)1-y-z(B)y(Mn)Z]O3 (A:Ag or Li, B=Ta) specimens prepared by the conventional ceramic processing. Their crystal structure, microstructure, dielectric and piezoelectric properties were investigated with different compositions (substituents and contents). Electrical properties of the specimens increased up to 0.075 mol Ag or Li addition and Ta addition improved their piezoelectric properties. The maximum values, d33, Qm, kp obtained were 153(pC/N), 351, 0.43 for Ag/Ta and 201(pC/N), 141, 0.4 for Li/Ta based NKN systems, respectively. When 0.005 mol Mn was added in Ag/Ta or Li/Ta based specimens, dielectric loss was effectively suppressed below 1.5% and piezoelectric constant, d33 was improved, although dielectric constant and Qm were somewhat lowered. These results were explained in terms of the formation of morphotropic phase boundary, sinterability, grain size, formation of oxygen vacancy and change of transition temperature.
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무연계 (Bi0.5Na0.5)TiO3 박막의 강유전특성 연구
강동헌 水原大學校 2013 論文集 Vol.27 No.-
(Bi0.5Na0.5)TiO3 (BNT) is well known as an excellent candidate for the lead free ferroelectric and piezoelectric materials due to its relatively high Tc, Pr and Ec, compared with other lead free materials. For BNT material, it is well known that Bi and Na have relatively low melting and boiling points compared with those of other elements, and are vaporized easily. In this study, BNT thin films were fabricated by the sol-gel method and their dielectric properties were investigated as a function of excess Bi and Na contents. As the content of excess Bi and Na increased, their properties were improved. For 0.1 mol addition, it showed the highest dielectric constant, remanant polarization and pyroelectric coefficient regardless annealing condition. While their properties were degraded with further excess Bi and Na addition. These results were explained in terms of phase present by XRD and surface morphology by SEM and AFM
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자체 정화용 고분자 필름에 적용 가능한 무기계 코팅소재 연구
강동헌 水原大學校 2020 論文集 Vol.34 No.-
A wide range of transparent and self-cleaning materials such as glass, outdoom r billboard, traffic sign board or building wall tile, are already commercially available. But, some practical limitations still restrict their widespread use in the outdoor sector due to difficulty of their replacements. In this study, we prepared the coating solutions with hydrophilic property by using different organic and inorganic materials, which wiill be applicable to the flexible polymer film. TiO2 nano solutions were prepared and their crystal structure, powder morphology and transmittance were analyzed. After modifying to alcohol based solutions, their wettability and photoactivity were characterized in terms of coating solution on polymer film.
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Lead Magnesium Niobate 계 세라믹스의 전왜성에 미치는 미세구조 의존성
姜東憲 수원대학교 산업기술연구소 1993 산업기술연구소논문집 Vol.8 No.-
Pb(Mg_1/3Nb_2/3)O_3 and Pb(Mg_1/3Nb_2/3)O_3 - PbTiO_3 ceramics were prepared by the columbite precursor method and their electrostrictive properties were investigated as a function of sintering temperature and excess MgO content. For the PMN ceramics, the longitudinal field induced strain, x increased with increasing sintering temperature and the addition of 5 mol% excess MgO led to the further increases in the maximum dielectric constant and electrostrictive strain. For the PMN-PT ceramics, larger strain value, compared to that of the PMN ceramics, was induced at room temperature and also electrostrictive coefficient, Q slightly increased with the addition of PbTiO_3. These results were explained by microstructure analysis.
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압전세라믹스를 이용한 이산화탄소 감지센서 제조 및 특성
강동헌 水原大學校 2015 論文集 Vol.29 No.-
According to recent environmental pollution problem, more efficient carbon dioxide sensors containing lead zirconium titanate (PZT) compositions have been actively studied and released. In this study, PZT ceramics such as 0.8Pb(Zr1-xTx)O3-0.05b(Sn0.5Sb0.5)O3-0.15MnO2 (x=0.65~0.85) were well-mixed, formed and sintered respectively in the ranges of 1230oC ~ 1290 oC for 2 hours. Their crystal structure, sinterability, microstructure and dielectric (pyroelectric) properties were investigated. The 0.8Pb(Zr0.65T0.3)O3 – 0.05b(Sn0.5Sb0.5)O3 - 0.15MnO2 (Zr/Ti=65/30) specimen sintered at 1270 oC showed the highest properties, which were explained in terms of different Zr/Ti ratios. Also it's sensor characteristics, output voltage via CO2 concentration showed good linearity with very few deviations from the theoretical value, which means the highly effective NDIR type gas sensor application.
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Pb(Mg1/3 Nb2/3)O3 세라믹스의 전기적 특성
강동헌,윤기현 한국세라믹학회 1989 한국세라믹학회지 Vol.26 No.5
PMN ceramics with excess MgO addition in the range of 0 to 70m/o were prepared, and their electrical properties, such as dielectric constant, tan$\delta$, diffuseness coefficient, remanent polarization, coercive field and electrical conductivity were measured. Dielectric constant and remanent polarization increased with up to 5m/o excess MgO and then decreased presumely due to the precipitation of second phase, etc. Electrical conductivity slightly increased with the addition of excess MgO.
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