arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1503.08515cond-mat.supr-con
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YBamCu1 + mOy(m = 2,3,4,5)超导体的某些性质

Some properties of YBamCu1+mOy (m = 2,3,4,5) superconductors

Piyamas Chainok, Thanarat Khuntak, Supphadate Sujinnapram, Somporn Tiyasri, Wirat Wongphakdee, Thitipong Kruaehong, Tunyanop Nilkamjon, Sermsuk Ratreng, Pongkaew Udomsamuthirun

摘要:

以Y_2O_3、BaCO_3和CuO为原料,采用固相反应法合成了YBaCu_(1+)mO_y超导体(m = 2,3,4,5):Y_(123)(YBa_2Cu_3 O_(7-x)),Y_(134)(YBa_3Cu_4 O_(9-x)),Y_(145)(YBa_4Cu_5 O_(11-x)),Y_(156)(YBa_5Cu_6 O_(13-x))。煅烧温度为950 ℃,烧结温度为950 ℃和980 ℃。用四探针法测量了Y123、Y134、Y145、Y156的电阻率,其Tconset值分别为97 K、93 K、91 K、85 K。采用XRD和Rietveld全断面分析方法,发现Y123、Y134、Y145和Y156的晶体结构为正交晶系,空间群为Pmmm,c/a分别为3.0、4.0、5.0和6.0。氧含量用碘量滴定法表征。Y123、Y134、Y145、Y156的Cu ~(3+)/Cu ~(2+)和氧含量分别为(0.28,6.83)、(0.19,8.81)、(0.13,10.79)、(0.16,12.92)。烧结温度的提高降低了样品的氧含量和临界温度。

英文摘要:

We synthesized the YBamCu1+mOy superconductors; m = 2,3,4,5 that were Y123 (YBa2Cu3O7-x), Y134 (YBa3Cu4O9-x), Y145 (YBa4Cu5O11-x), Y156 (YBa5Cu6O13-x), by solid state reaction with the Y2O3, BaCO3 and CuO as the beginning materials. The calcination temperature was 950 C and varied the sintering temperature to be 950 C and 980 C. The resistivity measurement by four-point-probe technique showed that the Tconset of Y123, Y134, Y145, Y156 were at 97 K, 93 K, 91K, 85 K, respectively. The XRD and Rietveld full-profile analysis method were used and found that the crystal structure was in the orthorhombic with Pmmm space group with the ratio c/a were 3.0, 4.0, 5.0 and 6.0 for Y123, Y134, Y145 and Y156, respectively. The oxygen content was characterized by Iodometric titration. The (Cu3+/Cu2+and Oxygen content) were (0.28, 6.83), (0.19, 8.81), (0.13, 10.79), (0.16, 12.92) of Y123, Y134, Y145, Y156 respectively. We also found that the increasing of sintering temperature has reduced the oxygen content and the critical temperature of all samples.

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