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2성분계 PZT 압전세라믹스의 Mole 比에 따른 전기적 특성에 관한 연구
설정식,이수대,강광용 경남대학교 환경문제연구소 1987 환경연구 Vol.9 No.-
Lead zirconate titanate (Pb (Zr_(x), Ti_(1-x)) O_(3)) piezoelectric ceramics were prepared from PbO, ZrO_(2) and TiO_(2). These oxides were wet ball-milled and were hot pressed at 1250℃ in 0_(2) for 4h at 50kg/cm^(2) finally, and were ascertained by x-ray diffraction experiments. Samples which were used for measurement, were classified into 5 types according to x-values and Curie temperatures determined for each samples, from the dielectric measurements at 1 KHz, are gradually lowered with the decrease of x-values and electromechanical coupling factors (k) which were calculated from the measurement of frequency-impedance relation are increased with the decrease of x-values. These results are fairly consistent with the ones reported previously.
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설정식 慶南大學校 附設 基礎科學硏究所 1997 硏究論文集 Vol.10 No.-
A photoacoustic technique for the determination of thermal diffusivity of opaque and transparent solid is developed. The technique is fast and avoids some of the difficulties of conventional methods. Thermal diffusivities for aluminum and quartz are measured and found be in good agreement with literature values.
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스크린 프린트 方法에 依한 CdS/Cu_(x)S 太陽電池 製作 및 特性조사
薛貞植,金永局 경남대학교 환경문제연구소 1982 환경연구 Vol.4 No.-
CdS/Cu_(x)S solar cells were prepared by using a screen printing method. A low resistivity CdS film was obtained by screen printing CdS paste on a glass substrate and then sintering it in N₂gas including a small amount of Cd vapor. CdS paste for screen printing was prepared by mixing loog CdS powder and 7g CdCl₂powder with propylen glycol(binder) in an agate mortar. CdCl₂was used as a flux. CdS paste was printed on a borosilicate glass substrate by a screen printing method, and then sintered at 640℃ in N₂gas for 1 hour using a furnace, a Cd metal was placed on the inlet side of N₂gas in the furnace and held at 400℃. The CdS film thus sintered had a resistivity of about 5~15Ω-cm, mobility μ_(e) of about 200~270㎠/Vㆍsec, a thickness of about 50~500㎛ and grain size of 5-lO㎛. Fabrication of a low resistivity CdS film and heat treatment in H₂gas after applying electrodes were very important factors in obtaining a high efficiency cell. Under AM1 sunlight simulator, the parameters for the typical cell are open-circuit voltage V_(DC)=0.4V, short-circuit current I_(SC)=5mA, fill factor FF=0.55 and conversion efficiency Л=1.12%.
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설정식 慶南大學校 附設 基礎科學硏究所 1998 硏究論文集 Vol.12 No.-
The absorption spectrometry by using photoacoustic effect is a very useful method for the study of materials. Conventional absorption spectrometry could not yield the absorption spectra of the powder type samples, Methyl orange, Acid orange and NiO. Photoacoustic spectra were obtained from these materials and these were compared with the absorption spectra of the powder samples dissolved in distilled water and the absorption spectra of the NiO crystal obtained by the conventional method. The results show a great deal of consistency between the two sets of spectra.
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이수대,설정식 慶南大學校 附設 基礎科學硏究所 1990 硏究論文集 Vol.2 No.-
The structure of the lead molybdate single crystals were investigated by the X-ray diffraction pattern. The lattice constants of the lead molybdate were a=b=5.44Å and c=12.12Å. The refractive index of the lead molybdate single crystals have been measured from room temperature to 300℃ with the Brewster angle. The refractive indices of the ordinary ray and extra ordinary ray were 2.3629 and 2.2511 at room temperature. The stress-optical coefficients q₁₂, q ₁₃and q₃₁ to be obtained by the Mach-Zehnder in teferometer were 1.027x????, 1.861x???? and 0.019x????m²/N at room temperature.
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강탄성 Switching에 의한 격자점의 변위 특성을 이용한 Pb₃(PO₄)₂ 단결정의 자발변형 측정
이수대,설정식 慶南大學校 附設 基礎科學硏究所 1996 硏究論文集 Vol.9 No.-
In order to measure components of the spontaneous strain tensor by the switching phenomena of Pb₃(PO₄)₂ single crystals, we derived the formulae for translational displacement and rotational displacement of the lattice points by switching between each states in ferroelasticity. By using this formulae, we suggested the method and the process for measurement of components of the spontaneous strain tensor. The value of es11 was measured from the variation of radial component and the variation of azimuthal angle by switching between each states at Pb₃(PO₄)₂ single crystals and it was -0.0217±0.0001. In addition, the value of es13 which was measured from the variation of zenithal angle was 0.0066±0.0001.
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Gd₂(MoO₄)₃ 단결정의 강탄성 Switching력에 관한 연구
이수대,설정식 慶南大學校 附設 基礎科學硏究所 1996 硏究論文集 Vol.8 No.-
In this study, we derived the formulae about enthalpy density per unit force when occured ferroelastic switching. The enthalpy contour lines were calculated from the spontaneous strain tensor and these formulae when was switched from a S₁ferroelastic state to a S₂ferroelastic state. The magnitude and the direction of minimum stress were estimated at the distribution charts of enthalpy density per unit force when was switched from a S₁state to a S₂state and we experimented on these phenomena. The direction that occur the switching phenomenon by the least compression force was the [110] direction when was switched from a S₁state to a S₂state and the switching force was between 60 N/㎠ and 70N/㎠ . Measured, the spontaneous strain tensor, e?? of Gd₂(MoO₄)₃single crystal from strain by the switching phenomenon was 1.57×10??.
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이수대,채건식,김영국,설정식 慶南大學校 附設 基礎科學硏究所 1989 硏究論文集 Vol.1 No.-
The temperature dependence of the ultrasonic velocity of 10 MHz and the absorption coefficient in the 10-30MHz range by the pulse echo method were determined in lead germanate single crystal. The velocity of longitudinal 10 MHz ultrasound along the c axis changed anomalously at the phase transition point and the jump was approximately 50m/sec. Near Curie point, the relaxation time and the kinetic coefficient of electric polarization from the Landau-Khalatnikov theory were calculated as ?? sec and ??, respectively. At room temperature, the viscosity tensor were measured as, ?? in the MKS units.
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손종윤,이수대,설정식 慶南大學校 附設 基礎科學硏究所 1997 硏究論文集 Vol.10 No.-
We studied the method to find the optimal menufacturing conditions for the longitudinal and the transversal piezoelectric vibrators with LiTaO₃single crystal. We calculated the magnitude of strain due to the antipiezoelectric effect at spherical coordinates. And then it is projected to the plane by the stereographic projection method. From these charts, we found the directions with the maximum value of vibrational efficiency and with the minimum value of vibrational noise for applied electric field. The optimal directions with minimum noise for the longitudinal piezoelectric vibrator are (16.6˚, 59.9˚), (16.6˚, 179.9˚), (16.6˚, 299.9˚). Longitudinal strain of these optimal directions is 1.29789×10-11. These ratio of the noise to the signal of this vibrator is 0.45%. The optimal directions with minimum noise for the transversal piezolectric vibrator are (60.0˚, 40.0˚), (60.0˚, 160.0˚), (60.0˚, 280.0˚), and strain of transversal mode is 3.50427×10-17. In this case, the ratio of the noise to the signal is 5.9%.
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