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首页> 外文期刊>Superconductor Science & Technology >Powder XRD investigation of crystal structure modification effects on superconductivity in the Sn-doped Yba_2Cu_(3-x)Sn_xO_(7-#delta#) systems
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Powder XRD investigation of crystal structure modification effects on superconductivity in the Sn-doped Yba_2Cu_(3-x)Sn_xO_(7-#delta#) systems

机译：粉末XRD研究晶体结构修饰对掺Sn Yba_2Cu_（3-x）Sn_xO_（7-＃delta＃）体系中超导性的影响

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摘要

The relationships between the crystal structuremodification, due to the doping element of Sn, and the criticaltemperature T_c of Sn-doped YB_2Cu_(3-x)Sn_xO_(7-#delta#),with x = 0.0,0.1,0.2,0.3, 0.4, 0.5, 0.6, have been investigated bymeans of the peak shift and the peak broadening of the powder x-ray diffraction pattern. The profiles of x-ray diffraction peaks, dueto crystal planes (006), (020), (021) and (200), were studied usingthe multi-peak fining technique which is based on the Gaussiandistribution function. It is interesting to note that the Sn-dopedatoms effectively occupy the Cu2 sites in the CuO_2 layer. Thecritical temperature of the Y-123 phase depends more sensitivelyon the lattice parameters a and b, rather than on the c-axisparameter c. The samples used for this investigation underwent thesame treatment to ensure the requirement for maintaining the sameoxygen content, particle size and residual stress. In this way, wecan make sure that the Sn doping basically causes the peak shiftand the peak broadening. Based on our results, we conclude thatSn doping in YBCO leads to an increase of the lattice constants aand b. The greater the expansion in a and b, the lower the criticaltemperature that results.
机译：x = 0.0、0.1、0.2、0.3、0.4时，由于Sn的掺杂元素引起的晶体结构改变与Sn掺杂的YB_2Cu_（3-x）Sn_xO_（7-delta＃）的临界温度T_c之间的关系分别通过粉末X射线衍射图的峰移动和峰展宽的平均值研究了0.5、0.6、0.5、0.6。使用基于高斯分布函数的多峰精细化技术研究了由于晶面（006），（020），（021）和（200）而引起的X射线衍射峰的轮廓。有趣的是，Sn掺杂原子有效地占据了CuO_2层中的Cu2位。 Y-123相的临界温度更敏感地取决于晶格参数a和b，而不是c轴参数c。用于本研究的样品进行了相同的处理，以确保保持相同的氧含量，粒度和残余应力的要求。通过这种方式，我们可以确保Sn掺杂基本上引起峰移动和峰展宽。根据我们的结果，我们得出结论，在YBCO中掺杂Sn会导致晶格常数a和b增大。 a和b的膨胀越大，导致的临界温度越低。

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