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육지수 ( Ji-su Yuk ),이삼행 ( Sam-haeng Yi ),이명규 ( Myung-gyu Lee ),박주석 ( Joo-seok Park ),김영곤 ( Young-gon Kim ),이성갑 ( Sung-gap Lee ) 한국전기전자재료학회 2024 전기전자재료학회논문지 Vol.37 No.2
(La0.7Sr0.3)(Mn1-xFex)O3 (LSMFO) (x = 0.03, 0.06, 0.09, 0.12) precursor solution are prepared by sol-gel method. LSMFO thin films are fabricated by the spin-coating method on Pt/Ti/SiO2/Si substrate, and the sintering temperature and time are 800℃ and 1 hr, respectively. The average thickness of the 6-times coated LSMFO films is about 181 to 190 nm and average grain size is about 18 to 20 nm. As the amount of Fe added in the LSMFO thin film increased, the resistivity decreased, and the TCR and B25/65-value increased. Electrical resistivity, TCR and B25/65-value of the (La0.7Sr0.3)(Mn0.88Fe0.12)O3 thin film are 0.0136 mΩ-cm, 0.358%/℃, and 328 K at room temperature, respectively. The resistivity properties of LSMFO thin films matched well with Mott’s VRH model.
Structural and electrical properties of La-Sr-Mn-O ceramics with Bi3+ content for thermistor devices
Do-Hui Kim,Jeong-Eun Lim,Byeong-Jun Park,Sam-Haeng Yi,Myung-Gyu Lee,Joo-Seok Park,Sung-Gap Lee 한양대학교 청정에너지연구소 2023 Journal of Ceramic Processing Research Vol.24 No.4
La0.7Sr0.3-xBixMnO3 (LSBMO) (0.025 ≤ x ≤ 0.15) films are fabricated by a sol-gel method and spin-coating method. All of thefabricated films have typical polycrystalline perovskite structures. In addition, no preferential orientation or impurity couldbe observed. The surface SEM images show almost homogeneous and uniform microstructures and the average thickness forthe LSBMO films is approximately 230 to 260 nm. When the resistivity is measured at room temperature, the TCR andB85/25-values gradually increases as the amount of Bi3+ increased, and the highest values of 0.023 mΩ·cm, 0.31%/°C and 299K are obtained in the La0.7Sr0.225Bi0.075MnO3 thin films. Polycrystalline LSBMO films follow the variable-range hopping (VRH)conduction model as they show electron-electron scattering and electron-phonon interactions for thermal stimulation.
Jae-Uk Lee,Jeong-Eun Lim,Ji-Soo Yuk,Sam-Haeng Yi,Myung-Gyu Lee,Joo-Seok Park,Young-Gon Kim,Sung-Gap Lee 한양대학교 청정에너지연구소 2023 Journal of Ceramic Processing Research Vol.24 No.6
BaTiO3/La0.7Sr0.3MnOs/BaTiO3 multilayer films are fabricated using the chemical solution deposition and spin-coatingmethod. The upper BT film exhibits an average grain size of approximately 42 nm, indicating a uniform and dense microstructure. The single-coated film has an average thickness ranging from 40 to 45 nm. A phase transition temperature of approximately4 °C is observed in all films. The BT/LSMO/BT multilayer film, coated with LSMO four times, demonstrates amaximum dielectric constant of 2008 at 20 °C. The BT/LSMO/BT multilayer film, coated with LSMO two times, shows a ΔTof 0.59 K at 24 °C. The remnant polarization, coercive field, and ΔT/ΔE of the BT/LSMO/BT multilayer film, coated withLSMO four times, are 19.8 μC/cm2, 42 kV/cm, and 4.56 mKcm/kV, respectively.
박병준 ( Byeong-jun Park ),육지수 ( Ji-su Yuk ),이삼행 ( Sam-haeng Yi ),이명규 ( Myung-gyu Lee ),박주석 ( Joo-seok Park ),이성갑 ( Sung-gap Lee ) 한국전기전자재료학회 2024 전기전자재료학회논문지 Vol.37 No.3
In this study, KTN heterolayer thin films were fabricated by alternately stacking films of K(Ta<sub>0.70</sub>Nb<sub>0.30</sub>)O<sub>3</sub> and K(Ta<sub>0.55</sub>Nb<sub>0.45</sub>)O<sub>3</sub> synthesized using the sol-gel method. The sintering temperature and time were 750℃ and 1 hour, respectively. All specimens exhibited a polycrystalline pseudo-cubic crystal structure, with a lattice constant of approximately 0.398 nm. The average grain size was around 130~150 nm, indicating relatively uniform sizes regardless of the number of coatings. The average thickness of a single-coated film was approximately 70 nm. The phase transition temperature of the KTN heterolayer films was found to be approximately 8~12℃. Moreover, the 6-coated KTN heterolayer film displayed an excellent dielectric constant of about 11,000. As the number of coatings increased, and consequently the film thickness, the remanent polarization increased, while the coercive field decreased. The 6-coated KTN heterolayer film exhibited a remanent polarization and coercive field of 11.4 μC/cm<sup>2</sup> and 69.3 kV/cm at room temperature, respectively. ΔT showed the highest value at a temperature slightly above the Curie temperature, and for the 6-coated KTN heterolayer film, the ΔT and ΔT/ΔE were approximately 1.93 K and 0.128×10<sup>-6 </sup>K·m/V around 40℃, respectively.
스핀-코팅법으로 제작한 K(Ta,Nb)O<sub>3</sub>/Pb(Zr,Ti)O<sub>3</sub> 이종층 박막의 전기 열량 효과
양영민,육지수,김지원,이삼행,박주석,김영곤,이성갑,Yang, Young-Min,Yuk, Ji-Soo,Kim, Ji-Won,Yi, Sam-Haeng,Park, Joo-Seok,Kim, Young-Gon,Lee, Sung-Gap 한국전기전자재료학회 2020 전기전자재료학회논문지 Vol.33 No.6
Heterolayered K(Ta,Nb)O<sub>3</sub>/Pb(Zr,Ti)O<sub>3</sub> thin films on Pt/Ti/SiO<sub>2</sub>/Si substrates were prepared by a sol-gel process and spin-coating method. The structural and electrical properties were measured to investigate the possibility of application as an electrocaloric effect device. All specimens exhibited dense and uniform cross-sectional structures without pores, and the average thickness of the specimen coated six times was approximately 394 nm. Curie temperatures were observed at 5℃ or less in type-I and 10℃ in type-II specimens, respectively. Type-II specimens coated 6 times showed a relative dielectric constant of 758 and remanent polarization of 9.71 μC/㎠ at room temperature. The maximum electrocaloric effect occurred between 20 and 25℃, slightly higher than their Curie temperature, and the electrocaloric property (ΔT) of the type-II specimens coated 6 times was approximately 1.2℃ at room temperature.