• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Key Engineering Materials >Solid-State Synthesis of Pb_2Sr_2CaCu_(3-y)S_x and Conducting Properties
【24h】

Solid-State Synthesis of Pb_2Sr_2CaCu_(3-y)S_x and Conducting Properties

机译：Pb_2Sr_2CaCu_（3-y）S_x的固态合成及导电性能

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

In this study complete substitution of O by S in Pb-Sr-Ca-Cu-O superconducting system that has the general formula Pb_2Sr_2MCu_3O_(8+δ) (M = Y, Ca) had been attempted. For this purpose, solid-gas reactions of solid mixture, PbO, Sr(NO_3)_2, CaO and CuO with a sulfidizing gas consisted of COS, CS_2, CO, CO_2 and sulfur vapour were performed. For M, only Ca was used. The obtained product Pb_2Sr_2CaCu_(3-y)S_x, was characterized by XRD, IR, SEM, EDX, conductivity measurements and chemical analysis. X-Ray powder diffraction pattern of Pb_2Sr_2CaCu_(3-y)S_x was found to be very similar to PbS diffraction pattern reported in JCPDS Card No.5-592 which has a rock salt structure with a = 5.946 A. Pb_2Sr_2CaCu_(3-y)S_x was indexed in monoclinic system with the refined unit cell parameters of a = 5.947(8), b=5.941(3), c=11.98(1) A and β=90.19(9)° . Since 'c' unit cell dimension is almost twice of a and b, it is concluded that a superstructure formation had resulted which is common for complex sulfides. The absence of metal oxygen bands in IR and O bands in EDX spectra is taken to be the proof of the complete substitution of O by S by solid gas reactions. The conductivity of Pb)2Sr_2CaCu_(3-y)S_x was measured by four-probe conductivity technique and was found to be metallic.
机译：在这项研究中，已尝试在通式为Pb_2Sr_2MCu_3O_（8 +δ）（M = Y，Ca）的Pb-Sr-Ca-Cu-O超导系统中用S完全取代O。为此，进行了固体混合物，PbO，Sr（NO_3）_2，CaO和CuO与由COS，CS_2，CO，CO_2和硫蒸气组成的硫化气体的固-气反应。对于M，仅使用Ca。通过XRD，IR，SEM，EDX，电导率测量和化学分析对所得产物Pb_2Sr_2CaCu_（3-y）S_x进行表征。发现Pb_2Sr_2CaCu_（3-y）S_x的X射线粉末衍射图谱与JCPDS卡5-592中报道的PbS衍射图谱非常相似，该卡的岩盐结构的a = 5.946 A.Pb_2Sr_2CaCu_（3-y ）S_x在单斜系统中用精炼的晶胞参数a = 5.947（8），b = 5.941（3），c = 11.98（1）A和β= 90.19（9）°进行索引。由于“ c”晶胞尺寸几乎是a和b的两倍，因此可以得出结论，形成了上层结构，这是复杂硫化物的常见现象。 EDX光谱中IR和O谱带中不存在金属氧谱带，可以证明固体气体反应完全取代了S。通过四探针电导率技术测量了Pb）2Sr_2CaCu_（3-y）S_x的电导率，发现它是金属的。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号