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SOL-GEL법을 이용한 강유전체 BaTiO₃박막 및 Ceramics 제조
조채룡,이수재,장민수,김호종,정세영,노동택,김성철 동의대학교 기초과학연구소 1993 基礎科學硏究論文集 Vol.3 No.1
Concentrated solution was prepared for a sol-gel process of BaTiO₃. Barium hydroxide and Ti-isopropoxide were used as the raw materials with methanol and isopropanol as solvents. Dense ferroelectric polycrystalline BaTiO₃thin films with the perovskite structure were fabricated by spin coating of the prepared concentrated solution on a few substrates. From XRD investigation, it was confirmed that tetragonal phase of polycrystalline BaTiO₃powders are formed after heat treatment above 550℃ in air and grain-oriented BaTiO₃thin films are obtained by coating of 0.06M concentrated solution on the substrates. It was observed that surfaces of thin films deposited on the substrates by our methods were formed crack-free and uniformly. The thickness of thin film which depends the concentration of the solution was 400∼900Å for 1 time coating, which was confirmed by SEM analysis. Ceramics and thin films show dielectric constant of 4600 (at 1㎑) and capacitance 300∼800㎊ (at 1㎑) at room temperature, respectively.
Hot-press한 PLZT(0.8~8/40/60) ceramics의 電氣的 性質
張敏守,李在鉉,盧東澤 부산대학교 1976 論文集 Vol.22 No.2
PLZT(0.8-8/40/60) ceramics were hot-pressed under the conditions of 1,000℃~1,200℃ at pressure of 43㎏/㎠ to 163㎏/㎠ for 5 hours in atmosphere. Relative dielectric constants for different La concentrations have been shown as a function of temperatures. The peaks in the dielectric constant were reduced in temperature and in height as the La content increased. Loss tangent of the PLZT ceramics was measured at the frequency range of 10³-10^(7) Hz. PLZT ceramics prepared under the conditions of 1,000℃-43㎏/㎠-5hrs showed minimum value of the loss tangent at 10^(5) Hz, but other samples manifested constant values at the higher frequencies than 10^(5) Hz