발화합성법에 의한 YBCO계 고온 초전도체 제조 및 특성

김영순; 이영민; 양석우; 김연수; 박정식; 신형식

HWAHAK KONGHAK, Vol.37, No.6, 930-936, December, 1999

Export Citation

발화합성법에 의한 YBCO계 고온 초전도체 제조 및 특성

Preparation and Characterization of YBCO High-T_c Superconductor Manufactured by Pyrophoric Synthetic Method

김영순, 이영민, 양석우, 김연수, 박정식, 신형식

초록

YBa₂Cu₃O_7-x계 고온 초전도체를 원료물질인 Y₂O₃, BaCO₃, CuO 및 AgNO₃ 분말로부터 발화합성법으로 제조하였다. YBa₂Cu₃O_7-x(Y123)와 1몰의 Y123에 Ag를 0.1 몰, 0.2몰 및 0.3몰 첨가한 YBa₂Cu₃O_7-x(Y123-Ag_y)의 특성을 입도분석기, differential scanning calorimeter(DSC), themogrvimetric analysis(TGA), X-ray diffractometer(XRD), 4단자 저항측정장치(4-probe resistivity measuring equipment), scanning electron microcope(SEM) 및 electron prove microanalysis(EPMA) 등으로 분석하였다. 50℃에서 건조한 발화용액은 210-240℃사이에서 발열반응이 일어나면서, 급격한 무게감소를 보여주는데, 240℃에서의 무게감소는 75%였다. 발화된 분말은 810℃와 975℃사이에서 흡열반응과 함께 무게감소가 있었으며, YBa₂Cu₃O_7-x가 형성되는 것을 확인하였다. 880℃에서 24시간 소결한 YBa₂Cu₃O_7-x의 T_c,zero는 92.2K였고, Y123에 Ag를 0.2 몰 첨가한 경우에 입자가 치밀한 미세구조를 갖는 것을 알 수 있었다.

The YBaCu₃O_7-x high-temperature superconductors were prepared by pyrohporic synthetic method from Y₂O₃, BaCO₃, CuO and AgNO₃ powders. The superconducting properties of YBaCu₃O_7-x and YBaCu₃Ag(sub>yO_7-x added to Ag of 0.1 mol, 0.2 mol, and 0.3 mol were investigated with particle size analyzer, differential scanning calorimeter(DSC), thermogravimetric analysis(TGA), X-ray diffractometer(XRD), 4-probe resistivity measuring equipment, scanning electron microcope(SEM), and electron prove micoranalysis(EPMA). The weight loss of 75% is observed in the temperature range of 210℃ to 240℃, which occurs with an exothermic peak of the powder neutralized and dried at 50℃. The powder prepared by pyrophoric synthetic method occurs with an endothermic peak and the weight loss in the temperature range of 810℃ to 975℃, and the simultaneous fomation of the YBaCu₃O_7-x. The T_c,zero of YBaCu₃O_7-x sintered at 880℃ for 24 hr was 99.2K, and microstructure of YBaCu₃O_7-x-Ag_0.2 was enhanced.

Keywords:Superconductor;YBCO;Pyrophoric Synthetic Method;DTA;Ag;Particle Size

[References]

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Kamat RV, Vittal Rao TV, Pillai KT, Vaidya VN, Sood DD, Physica C, 181, 245 (1991)
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[1] Onnes HK, Ledien Comm., 120b (1911)

[2] Bednorz JG, Muller KA, Z. Phys., B64, 189 (1986)

[3] Chu CW, Hor PH, Meng RL, Gao L, Huang ZJ, Wang YQ, Phys. Rev. Lett., 58(4), 405 (1987)

[4] Hor PH, Gao L, Meng RL, Huang ZJ, Wang YQ, Forster K, Vassilious J, Chu CW, Wu MK, Ashburn JR, Jorng CJ, Phys. Rev. Lett., 58(9), 911 (1987)

[5] Maeda H, Tanaka Y, Fukutomi M, Asano T, Jpn. J. Appl. Phys., 27(2), L209 (1988)

[6] Sheng ZZ, Hermann AM, Ali AE, Almasan C, Estrada J, Datta T, Matson RJ, Phys. Rev. Lett., 60(10), 937 (1988)

[7] Xiao G, Streitz FH, Gavrin A, Du YW, Chien CL, Phys. Rev., B, Condens. Matter, 35(16), 8782 (1987)

[8] Peterson RL, Ekin JW, Phys. Rev., B, Condens. Matter, 37(16), 9848 (1988)

[9] Kim CJ, Kim KB, Hong GW, Won DY, J. Mater. Res., 7(9), 2349 (1992)

[10] Dwir D, Affronte M, Pavuna D, Appl. Phys. Lett., 55(4), 399 (1989)

[11] Bhattacharya D, Pathak LC, Mishra SK, Sen D, Chopra KL, Appl. Phys. Lett., 57(20), 2145 (1990)

[12] Park JH, Kim BC, Song JT, Korean J. Mater. Res., 4(1), 37 (1994)

[13] Kim YS, Yang SW, Park JS, Shin HS, J. Korean Ind. Eng. Chem., 7(4), 639 (1996)

[14] Park JS, Kim YS, Yang SW, Kim CY, Shin HS, J. Korean Ind. Eng. Chem., 9(2), 165 (1998)

[15] Jin S, Tiefel TH, Sherwood RC, Davis ME, van Dover RB, Kammlott GW, Fastnacht RA, Keith HD, Appl. Phys. Lett., 52, 2074 (1988)

[16] Salama K, Selvamanikam V, Gao L, Sun K, Appl. Phys. Lett., 54, 2352 (1989)

[17] Murakami M, Morita M, Doi K, Miyamoto M, Jpn. J. Appl. Phys., 28, 1189 (1989)

[18] Fujimoto H, Murakami M, gotoh S, Koshizuka N, Tanaka S, Adv. Superconductivity II, 285 (1990)

[19] Park JS, Kim YS, Yang SW, Cho IJ, kim CY, Shin HS, Korean J. Chem. Eng., 15(3), 304 (1998)

[20] Sun YK, Oh IH, Lee WY, Korean J. Chem. Eng., 14(1), 59 (1997)

[21] Yang SW, Kim CJ, Hong GW, Shin HW, Korean J. Mater. Res., 8(12), 1082 (1998)

[22] Yang SW, Lee YM, Kim YS, Park JS, Kim CJ, Hong GW, Shin HS, J. Korean Ind. Eng. Chem., 9(7), 1011 (1998)

[23] Park JS, J. Korean Ind. Eng. Chem., 10(5), 772 (1999)

[24] Kishan P, Nagpaul LK, Chatterjee SN, Solid State Commun., 65, 1019 (1988)

[25] Nomura S, Yoshino H, Ando K, J. Cryst. Growth, 92, 682 (1988)

[26] Kamat RV, Vittal Rao TV, Pillai KT, Vaidya VN, Sood DD, Physica C, 181, 245 (1991)

[27] Wiesner U, Krabbes G, Ueltzen M, Magerkurth C, Plewa J, Altenburg H, Physica C, 294, 17 (1998)

[28] Fan ZG, Shan YQ, Wang WH, Wang XY, Soh DW, Zaho ZX, Physica C, 282, 495 (1997)

[29] Park JS, Kim YS, Shin HS, HWAHAK KONGHAK, submitted (1999)

[30] Kim YS, Park JS, Chung BW, Shin HS, Korean J. Chem. Eng., 12(5), 563 (1995)