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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Institute of Electrical and Electronic Material Engineers
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Journal DOI :
The Korean Institute of Electrical and Electronic Material Engineers
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Volume & Issues
Volume 14, Issue 12 - Dec 2001
Volume 14, Issue 11 - Nov 2001
Volume 14, Issue 10 - Oct 2001
Volume 14, Issue 9 - Sep 2001
Volume 14, Issue 8 - Aug 2001
Volume 14, Issue 7 - Jul 2001
Volume 14, Issue 6 - May 2001
Volume 14, Issue 5 - May 2001
Volume 14, Issue 4 - Apr 2001
Volume 14, Issue 3 - Mar 2001
Volume 14, Issue 2 - Feb 2001
Volume 14, Issue 1 - Jan 2001
Volume 12, Issue 4 - 00 2001
Selecting the target year
Metal(Ti, Nb) Coating and Silicidization of Si-tip for FILD Emitter Applications
Journal of the Korean Institute of Electrical and Electronic Material Engineers, volume 12, issue 4, 2001, Pages 291~291
TI and Nb metal thin films were coated on the Si micro-tip arrays for improvement of the field emission performance. The Si micro-tip arrays have The metal-coated Si micro-tip arrays were annealed in vacuum environment. Their material and electrical properties were analyzed by using SEM, AES, XRD and field emission tester. The work-function of Si micro-tip arrays was reduced by metal-coating/silicidization. Therefore the turn-on voltages of these devices were deceased, and the current densities were increased.
Photoelectrochemical etching of GaN using KOH based solution
Kim, U Ram ; Jeong, Seong Hun ; Mun, Dong Chan ; Lee, Won Sang ; Kim, Seon Tae ;
Journal of the Korean Institute of Electrical and Electronic Material Engineers, volume 12, issue 4, 2001, Pages 298~298
The PEC(photoelectrochemical) etching process of GaN using Hg arc lamp and KOH based solution at room temperature was investigated. The dark etching process showed that etching process was PEC etching and high quality crystalline was obtained. The UV light generated e-h pairs in surface aid the formation of oxide. The etch rate were characterized as a function of an applied voltage and mol of KOH solutions. The etch rate varied from 750Å/min to 1300Å/min at 0.04mol and from 1000Å/min to as 2000Å/min at0.1mol KOH solution. The surface roughness and etch rate were increased with the applied voltage and the mol of KOH solution. The surface composition after etching was studied using XPS.
Structure and Electrical Properties of
Kim, Bu Geun ; Kim, Jae Yun ; Kim, Gang Eon ; Jeong, Su Tae ; Jo, Sang Hui ;
Journal of the Korean Institute of Electrical and Electronic Material Engineers, volume 12, issue 4, 2001, Pages 305~305
The sintering characteristics and electrical properties of the dielectric resonator ceramic,
were studied. Good ceramics were obtained by substitution of Sr in
system. The hexagonally ordered superstructure was observed in all samples, the height of superstructure lines of the X-ray patterns increased with increasing Ta. The dc resistivities of samples were
Ωcm at room temperature, these values were nearly constant at 180(x=0) - 300℃(x=1). However, the resistivity of samples decreased rapidly above those temperature and their activation energy were from 1.75 to 2.07 eV. With the increasing of Ta, the relative dielectric constant was linearly decreased 32.2(x=0) to 25.9(x=1) and also the temperature coefficient of resonance frequency,
was decreased 58.4(x=0) to 32.5(x=1) ppm/℃. The quality factor(Q×f) of sample was the highest at x=0.8 and its value was 80,674 GHz.
A Study on the Resonance and Vibration Velocity Characteristics in Single-Phase Ultrasonic Motor
Park, Man Ju ; Kim, Jin Su ;
Journal of the Korean Institute of Electrical and Electronic Material Engineers, volume 12, issue 4, 2001, Pages 312~312
The Effect of glass, BaWO₄and CuO Additions on Microwave Dielectrics Properties in the BaTiO₃-3TiO₂Ceramics for Mobile Communication Multilayer Chip Component
Yun, Jung Rak ; Kim, Ji Gyun ; Lee, Heon Yong ; Lee, Seok Won ;
Journal of the Korean Institute of Electrical and Electronic Material Engineers, volume 12, issue 4, 2001, Pages 319~319
The effect of glass addition on microwave dielectric properties of BaTiO₃-3TiO₂modified BaWO₄or CuO was investigated. BaTiO₃-3TiO₂ceramics with 3wt% glass addition sintered at 1050℃ gave εr=35 Q*f0=6,800(at 5[GHz]) and τf=28[ppm/℃].In order to obtain material with a nearly zero of τf(temperature coefficient of resonant frequency), the BaTiO₃-3TiO₂ceramics with 3wt% glass and 6wt% BaWO₄addition sintered at1050℃ gave εr=33.8, Q*f0=7,500(at 5[GHz]) and τf=4.8[ppm/℃]. In the composition of BaTiO₃-3TiO₂+ 3wt% glass + 6wt% BaWO₄+ 1.5wt CuO addition sintered at 960℃ we could obrain microwave dielectric properties of εr=31.8, Q*f0=6,200(at 5[GHz]) and τf=3.5[ppm/℃].It is applicable to microwave multilayer chip component with Ag conductor.
A study on deposition and characterization low-k Parylene film
Heo, Hyeon ; Seo, Ju Won ; Kim, Min Su ; Ban, Jae Gyeong ;
Journal of the Korean Institute of Electrical and Electronic Material Engineers, volume 12, issue 4, 2001, Pages 326~326
In this paper, We have dealt with the analysis and fabrication of interconnection structure using low-k parylene dielectrics and copper electrode(Cu/parylene).This structure us superior to traditional SiO₂/aluminium structure on low temperature processes, high speed operation and high density integration. The quasi-static FEM(finite element method)analysis was performed on COW(coplanar waveguide) electrodes insulated by each SiO₂and parylene layer. The dependence of CPW capacity as the function of the dielectric constants and thickness of insulator was calculated. Physical adhesive and chemical tests of parylene layer deposited on glass and under various metal layer have been performed. After that, COW has been formed by traditional photolithographic processes. Parylene has a good adhesive property to glass substrate and Cu, Au better than Al. And patterning and etching of metal on parylene using various chemicals was performed. We have not found any outstanding problems for the post metal process.
NO₂Gas Sensor Utilizing Pt-WO₃-Si₃N₄-SiO₂-Si-Al Capacitor
Kim, Chang Gyo ;
Journal of the Korean Institute of Electrical and Electronic Material Engineers, volume 12, issue 4, 2001, Pages 333~333
A new gas-sensitive capacitor utilizing Pt-WO₃-Si₃N₄-SiO₂-Si-Al MIS structure has been explored. The incorporation of Pt as the catalytic gate and WO₃as the gas adsorptive layer with the silicon MIS capacitor enhances the sensitivity to NO₂at a relatively low temperature. The device for the detection of NO₂are described as a function of the gas pressure and temperature ranging from 23℃ to 100℃. The physical and chemical mechanisms responsible for the gas sensing behaviors are discussed. A new detection model based on a change in concentration of NO₂ions at Pt WO₃interface is proposed for the sensing mechanism. The model is confirmed by the reaction kinetic analysis at the interface.
Application and Electrochemical Properties of PVDF based Polymer Electrolyte for Dual lon battery
Kim, Jong Uk ; Song, Hui Ung ; Gu, Hak Bon ;
Journal of the Korean Institute of Electrical and Electronic Material Engineers, volume 12, issue 4, 2001, Pages 340~340
The purpose of this study is to research and develop solid polymer electrolyte(SPE) for Li secondary battery. This paper describes temperature dependence of conductivity, impedance spectroscopy, electro chemical properties of PVDF electrolytes as a function of a mixed ratio. Polyvinylidene(PVDF) based polymer electrolyte films were prepared by thermal gellification method fo preweighed PVDF, plasticizer and Li salt. The conductivity of PVD electrolytes was
electrolyte shows better conductivity of the others.
electrolyte remains stable up to 4.7V vs Li/
Steady state current method and ac impedance were used for the determination of transference numbers in PVDFD electrolyte film. The transference number of
electrolyte is 0.58. A new type of dual ion battery using PPy and carbon composite film was shown good propeties.
A study on the Electrical Properties of Ploy(ethylene oxide) based Polymer Electrolytes for All-solid-state Battery
Kim, Jong Uk ; Gu, Hal Bon ; Park, Gye Sun ; Lee, Gyeong Seop ; Park, Bok Gi ;
Journal of the Korean Institute of Electrical and Electronic Material Engineers, volume 12, issue 4, 2001, Pages 347~347
The purpose of this study is to research and develop PEL/PVDF electrolytes and LiMn₂O₄ composite cathode for all-solid state lithium rechargeable battery. We investigated electrochemical properties, AC impedance response and charge/discharge cycling of LiMn₂O₄/SPE/Li cells. By adding PVDF to PEO-LiClO₄-PC-EC electrolyte, its conductivity was higher than that of PEO-LiClO₄-PC-EC eledtrolyte. Also
remains stable up to 4.4V vs Li/
. The conductivity of PEO4PVDF4LiClO4PC5EC5 electrolyte was
S/cm at room temperature. The radius of semicircle associated with the interfacial resistance of LiMn2O₄/SPE/Li cell increased very slowly during charge processing from 2.97V to 4.08V. And then the cell resistance was decreased after charge processing. The discharge capacity based on LiMn₂O₄of 1st and 20th cycles was 144mAh/g and 118mAh/g. The LiMn₂O₄/SPE/Li cell was shown good properties
Variation of Crystal Phase and Electrochemical Properties of LiMn₂O₄Cathode Active Material by Calcining Condition
Jeong, In Seong ; Song, Hui Ung ; Lee, Jin ; Park, Gye Chun ; Park, Bok Gi ; Gu, Hal Bon ;
Journal of the Korean Institute of Electrical and Electronic Material Engineers, volume 12, issue 4, 2001, Pages 355~355
We have prepared LiMn₂O₄cathode active material for lithium ion battery and have investigated eletrochemical properties. All cathode active materials calcined at 800℃ formed fairly well the spinel phase based on the cubic phase. Especially, cathode active material calcined at 800℃ for 36hr showed the (111)/(311) peak ratio of 0.37 in X-ray diffraction pattern. It high mixing degree of cation and the regularity of lattice. In cyclic voltammetry, cathode active material calcined at 800℃ for 36hr exhibited two oxidation and reduction peaks in 3.0~4.5V range. Cathode active material calcined at 800℃ fot 36hr displayed charge and discharge capacity of 130mAh/g and 121mAh/g, respectively, at the first cycle, and after the fiftieth cycle, it is stabilized to be 110mAh/g and 100mAh/g, respectively. In this study, we confirmed that spinel phase based on cubic phase was formed fairly well at 800℃, and cathode active material calcined at ℃ for 36hr showed the best charge/discharge property.
Relationship Between the pretilt Angle and the Anchoring Strength in Nematic Liquid Crystal on Rubbed Polyimide Surface
Journal of the Korean Institute of Electrical and Electronic Material Engineers, volume 12, issue 4, 2001, Pages 361~361
Development of the joining of Bi-Pb-Sr-Ca-Cu-O superconducting tape
Journal of the Korean Institute of Electrical and Electronic Material Engineers, volume 12, issue 4, 2001, Pages 368~368
We evaluated the effects of joining process on the properties of Bi-2223 superconducting tape fabricated by powder-in-tube(PIT) technique. Specifically, we optimized the following processing variables : contact method, selection of masking materials and etchants, sequence of joining process, shape of joined area and pressure have been optimized. The joining of tapes was carried out using a lap-joint method. In the process, tapes were masked and etched to expose the superconductor core in the shape of 'ㅁ' and 'ㄷ'. The exposed cores of the two tapes were brought into contact, uniaxially pressed in the range of 140-4,000 MPa, and sintered. Subsequently, the current capacity and mechanical property of the joined tape was measured as a function of uniaxial pressure. It was observed that the current capacity and mechanical strength were significantly dependent on uniaxial pressure. The joined tape, fabricated with a pressure of 1,600 MPa, showed the highest value of current capacity(90%) of the tape itself. The highest point of current capacity is believed to due to improvements in core density, contacting area and grain alignment. In addition, the strength of the joined tape subjected to pressure of 1,000 MPa was measured to be about 88% of the unjoined tape.
The Volume Resisitivity Characteristics on Fluid Flow of Ultra-High Trandsformer Oils added BTA
Lee, Jong Pil ; Lee, Yong U ; Lee, Su Won ; Sin, Jong Yeol ; Hong, Jin Ung ;
Journal of the Korean Institute of Electrical and Electronic Material Engineers, volume 12, issue 4, 2001, Pages 377~377
Specimens stirred with the several kinds of benzotriazole(hereinafter referred to BAT) addition which is very effective to decrease the streaming electrification, are tested to investigate the change of properties for insulating fluid using in ultra-high voltage transformer, and it will give a guideline to find out a proper quantity of BTA addition for the most effective suppression against the streaming electrification. At first, gas chromatography is analyzed in order to find out the change of chemical properties of specimen added BTA. The characteristics on volume resistivity is investigated in experimental device built in laboratory to figure our the electrical properties in a flowing transformer oil added BTA. As a consequence, in GC, we could nor find out the change of the physical properties in an insulating fluid by BTA. In a flowing transformer oil, the characteristic on volume resistivity of specimen contained BTA 10[ppm] are superior to the others.
Aging Properties of SMD type quartz crystal resonator with variation of electrodes
Sin, Hyeon Gyu ; Choe, Deok Gyu ;
Journal of the Korean Institute of Electrical and Electronic Material Engineers, volume 12, issue 4, 2001, Pages 383~383
Electrode and adhesion layer were deposited onto quartz crystal blank as electrodes by thermal evaporation method. Quartz crystal resonators was made by using that quartz crystal blanks and then frequency stability was measured with variation of electrode materials and annealing temperatures. Au, Ag, and Al were used as electrode materials and the resonator which has Au electrode had the finest frequency stability. NiCr, Ni, Ti, Al, and Ag were used as adhesion layer between electrode and quartz crystal blanc because the adhesion force between Au and quartz crystal blanc were not strong enough for the electrode. In adhesion test. NiCr had the finest adhesion force, so we used it as adhesion layer in this work. The annealing process from R. T. to 350℃ changed the microstructure of electrode and the diffusion of adhesion layer into electrode was observed. After the annealing at 250℃, the grain growth of electrode material by recrystallization was observed and the observations by auger electron spectroscopy indicated that the adhesion layer diffused info Au electrode during annealing process Acceleration test showed that the diffusion had influenced the frequency shift. The sample which was annealed at 150℃ had the first frequency stability