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고상반응법과 발화합성법에 의한 Y<sub>2</sub>Ba<sub>1</sub>CU<sub>1</sub>O<sub>5</sub> 산화물의 반응특성
박정식,Park, Jeong-Shik 한국공업화학회 1999 공업화학 Vol.10 No.5
$Y_2Ba_1Cu_1O_5(Y211)$ 분말은 출발물질로서 $Y_2O_3(99.9%)$, $BaCO_3(99.9%)$, and CuO(99.9%) 분말을 사용하여 고상반응법과 발화합성법을 이용하여 제조하였다. $Y_2Ba_1Cu_1O_5(Y211)$ 분말에 대한 상형성과 반응속도는 열처리 온도와 반응시간에 따른 시료들을 X-선 회절분석을 이용하여 연구하였다. X-선 회절선으로부터 측정된 전화율($X_{211}$)과 반응특성으로부터 상 형성속도가 분말의 입자크기에 의해 지배되는 것을 알 수 있었다. 그리고 발화합성법으로 제조된 Y211상의 활성화에너지(${\Delta}E_a$)는 고상반응법에 의해 제조된 것의 149.46 kJ/mol과 비교할 때 136.42 kJ/mol을 나타내었다. $Y_2Ba_1Cu_1O_5$계에서의 활성화에너지 값은 발화합성법이 고상반응법보다 더욱 효율적인 방법임을 보였다. $Y_2Ba_1Cu_1O_5(Y211)$ powders were prepared by pyrophoric synthesis method and by solid state reaction method using $Y_2O_3(99.9%)$, $BaCO_3(99.9%)$, and CuO(99.9%) powders in both of these processes. The phase formation and reaction kinetics of $Y_2Ba_1Cu_1O_5$ powders have been studied using X-ray diffraction analysis(XRD) of samples at various heat treatment temperatures and reaction time. The reaction characterization suggested that the phase formation rate is mainly controlled by the particle size of Y211 powders. The activation energy(${\Delta}E_a$) of Y211 phase formation in this pyrophoric synthesis method was found to be 136.42 kJ/mol compared with 149.46 kJ/mol for that of solid state reaction method. These results data showed that the pyrophoric synthesis method is kineticaly more efficient than the solid state reaction method in this $Y_2Ba_1Cu_1O_5$ system.
박정식 ( Jeong Shik Park ) 한국스포츠리서치 2007 한국 스포츠 리서치 Vol.18 No.4
This study is to examine the relation between the participation of leisure sport activity of office workers and culture disposition. To achieve this goal, 396 male and female adults office workers were extracted as random samples, aged over 20 years old, living in Seoul. The questionnaire for culture disposition was based on the concept suggested by Markus and Kitayama(1991) and translated by Ko et. al. (1996). It is the measurement of mutual independent and cooperative disposition. Cronbach`s α is from .67 to .78. The procedure was to collect the self-filled out data and then analyze through descriptives, ancova and multiple regression. The following is the conclusion drawn through methods and procedures mentioned above. First, the leisure sports activity for office workers marked high disposition of mutual cooperative culture for non office-worker participants. Also, the types of leisure sports activity depend on mutual independent disposition of culture. In other words, non office-worker participants has higher mutual independent self view than office workers. Second, the longer the leisure sports activity for office workers, the higher are the mutual cooperative and mutual independent culture disposition. In addition, the greater the participation, the higher is the mutual cooperative culture disposition. At last, the higher the degree of participation, the higher is the mutual cooperative and mutual independent culture disposition.
발화합성법으로 제조한 YBa2Cu3-yAgyO7-x 의 초전도 특성
김영순,양석우,박정식,신형식 ( Young Soon Kim,Suk Woo Yang,Jeong Shik Park,Hyung Shik Shin ) 한국공업화학회 1996 공업화학 Vol.7 No.4
원료물질인 Y₂O₃, BaCO₃, CuO 및 AgN0₃ 분말로부터 Y계 고온초전도체를 발화합성법으로 제조하였다. YBa₂Cu₃O_7-x와 Cu를 Ag로 부분 치환한 YBa₂Cu_3-yAg_yO_7-x의 특성을 X-ray diffractometer, resistivity measuring equipment, SEM, and Vickers Hardness 등으로 분석하였다. YBa₂Cu₃O_7-x의 Tc,zero는 91K였고, 밀도는 5.2g/cm³, 경도는 590kg/mm²였다. Cu를 Ag로 0.15몰 이하 부분 치환한 YBa₂Cu_3-yAg_yO_7-x의 경우 임계온도(Tc)는 거의 변하지 않으면서 미세구조, 밀도 및 경도가 향상되었다. The YBa₂Cu₃Ag_yO_7-x high-temperature superconductors were prepared by pyrophoric synthetic method from Y₂O₃, BaCO₃, CuO, and AgNO₃, powders. When we were partially substituted Ag for Cu in YBa₃Cu_3-yAg_yO_7-x, the superconducting properties of YBa₂Cu₃O_7-x were investigated with X-ray diffractometer, resisitivity measuring equipment, SEM, and Vickers Hardness. The Tc,zero of YBa₂Cu₃O_7-x was 91K, the density was 5.2g/cm³, and the hardness was 590kg/mm². When Ag was substituted below y=0.15, electrical property of YBa₂Cu_3-yAg_yO_7-x did not change but microstructure, density, and hardness were enhanced.
발화합성법으로 제조한 YBa<sub>2</sub>Cu<sub>3-y</sub>Ag<sub>y</sub>O<sub>7-x</sub>의 초전도 특성
김영순,양석우,박정식,신형식,Kim, Young-Soon,Yang, Suk-Woo,Park, Jeong-Shik,Shin, Hyung-Shik 한국공업화학회 1996 공업화학 Vol.7 No.4
원료물질인 $Y_2O_3$, $BaCO_3$, CuO 및 $AgNO_3$ 분말로부터 Y계 고온초전도체를 발화합성법으로 제조하였다 $YBa_2Cu_3O_{7-x}$와 Cu를 Ag로 부분 치환한 $YBa_2Cu_{3-y}Ag_yO_{7-x}$의 특성을 X-ray diffractometer, resistivity measuring equipment, SEM, and Vickers Hardness 등으로 분석하였다. $YBa_2Cu_3O_{7-x}$의 Tc,zero는 91K였고, 밀도는 $5.2g/cm^3$, 경도는 $590kg/mm^2$였다. Cu를 Ag로 0.15몰 이하 부분 치환한 $YBa_2Cu_{3-y}Ag_yO_{7-x}$의 경우 임계온도(Tc)는 거의 변하지 않으면서 미세구조, 밀도 및 경도가 향상되었다. The $YBa_2Cu_{3-y}Ag_yO_{7-x}$ high-temperature superconductors were prepared by pyrophoric synthetic method from $Y_2O_3$, $BaCO_3$, CuO, and $AgNO_3$ powders. When we were partially substituted Ag for Cu in $YBa_3Cu_3O_{7-x}$, the superconducting properties of $YBa_2Cu_{3-y}Ag_yO_{7-x}$ were investigated with X-ray diffractometer, resisitivity measuring equipment, SEM, and Vickers Hardness. The Tc,zero of $YBa_2Cu_3O_{7-x}$ was 91K, the density was $5.2g/cm^3$, and the hardness was $590kg/mm^2$. When Ag was substituted below y=0.15, electrical property of $YBa_2Cu_{3-y}Ag_yO_{7-x}$ did not change but microstructure, density, and hardness were enhanced.