研究了低氧分压气氛中,不同熔化处理温度下单芯银包套带材(Bi,Pb)-2223(以下称Bi-2223)芯部熔化分解及随后的缓慢冷却阶段,淬火试样中Bi-2223,Bi-2201和Bi-2212相之间的演变关系.结果显示,在Tp=855℃~865℃范围内,随着熔化处理温度(Tp)的升高,淬火带材中Bi-2223相相对含量逐渐减少,而Bi-2201相含量则明显增加.Tp=855℃~860℃时,Bi-2223相发生部分分解,其淬火后的主要产物为Bi-2201,(Sr,Ca)2CuO3(2:1 AEC)和(Sr,Ca)14Cu24O41(14:24 AEC).经过随后的缓慢冷却,部分分解的Bi-2223相可以直接从液相中再形成.在所有熔化试样及部分熔化后慢冷所得的试样中均未发现Bi-2212相.当Tp=865℃时,Bi-2223相则全部分解,在同样冷却条件下,其回复过程经历了两个不同的途径,一是少量Bi-2223相直接从液相中生成,二是先从液相中析出Bi-2212相,在随后继续冷却过程中再转变为Bi-2223相.由于Bi-2212转变为Bi-2223所固有的迟缓特性,以致在本实验的冷却条件下,完全分解的Bi-2223相只能部分得到回复.
参考文献
[1] | Cecchetti E.;Vander Sande JB.;Ferreira PJ. .A model for texture development in BSCCO high-T-c superconductors[J].Superconductor Science & Technology,2000(8):1270-1278. |
[2] | Xia S K;Polasek A;Saleh L A et al.[J].Physica C,2004,408-410:911. |
[3] | Flahaut E;Bourgault D;Soubeyroux J L .[J].Physica B,2004,350:339. |
[4] | Liu YS.;Li CS.;Zhang PX.;Yu ZM.;Zheng HL.;Xiong XM.;Liu FS.;Wang QY.;Feng Y.;Zhou L. .Partial-melting process for (Bi,Pb)-2223/Ag tapes prepared using two-compound powders[J].Physica, C. Superconductivity and its applications,2003(0):142-145. |
[5] | Ling Hua;Jaimoo Yoo;Jaewoong Ko et al.[J].PHYSICA C,1998,308:105. |
[6] | Liu H K;Zeng R;Fu X K et al.[J].PHYSICA C,1999,325:70. |
[7] | Jiang C H;Yoo J M;Ko J W et al.[J].Superconductor Science and Technology,2003,16:595. |
[8] | Park C.;Cook LP.;Snyder RL.;Sastry PVPSS.;West AR.;Wong-Ng W. .Melting investigation of Bi2Sr1.9Ca2.1Cu3O10+x by high temperature X-ray diffraction and quenching[J].Physica, C. Superconductivity and its applications,1998(3/4):265-276. |
[9] | Lu XY.;Sugawara K.;Kamada S.;Nagata A. .Direct observation of melting and solidification of Bi1.8Pb0.4Sr1.9Ca2.1Cu3.5Ox in various oxygen atmospheres by high-temperature optical microscopy[J].Physica, C. Superconductivity and its applications,2001(1/4):313-320. |
[10] | Giannini E.;Savysyuk I.;Garnier V.;Passerini R.;Toulemonde P. Flukiger R. .Reversible melting and equilibrium phase formation of (Bi, Pb)(2)Sr2Ca2Cu3O10+delta[J].Superconductor Science & Technology,2002(11):1577-1586. |
[11] | Kovac P;Eastell C J;Pachla W et al.[J].PHYSICA C,1999,292:322. |
[12] | Chen X P;Li M Y;Qu T M et al.[J].Superconductor Science and Technology,2003,16:1162. |
[13] | Polasek A;Majewski P;Serra E T et al.[J].Physica C,2004,408-410:860. |
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