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首页> 外文期刊>Philosophical magazine, B. Physics of condensed matter, electronic, optical, and magnetic properties >High-resolution transmission electron microscopy study of ordered or disordered arrangements of Cu, C and N in the charge-reservoir blocks of a series of high-T-c superconductors: (Cu, C, N)Sr2Can-1CunOy (n=1-6)
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High-resolution transmission electron microscopy study of ordered or disordered arrangements of Cu, C and N in the charge-reservoir blocks of a series of high-T-c superconductors: (Cu, C, N)Sr2Can-1CunOy (n=1-6)

机译：高分辨率透射电子显微镜研究一系列高T-c超导体（Cu，C，N）Sr2Can-1CunOy（n = 1-6）的电荷储存区中Cu，C和N的有序或无序排列

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A series of new oxycarbonitrate superconductors, (Cu, C,N)Sr2Can-1CunOy, (n = 1-6), recently prepared in a Sr-Ca-Cu C-N-O system under a high pressure of 5.6 GPa, are examined by electron diffraction and high-resolution transmission electron microscopy, to reveal arrangements of Cu and C (N) in the charge-reservoir blocks (CRBs). Ordered arrangements of Cu and C (N) are observed in the compounds with n = 1-4, and almost random arrangements for those with n = 5-6. In the first two series of compounds, (Cu, C, N)-1201 (n = 1) and (Cu, C, N)-1212 (n = 2), an ordering scheme of -Cu-C(N)-C(N)-C(N)-Cu-with fourfold periodicity is observed, indicating that the ratio of Cu to C (N) in the CRB is 1 to 3. For (Cu, C, N)-1234 (n = 4), with highest T-c of 113 K in the series, the ordering scheme of Cu C(N)-Cu-C(N) Cu with twofold periodicity is observed, indicating that the ratio of Cu to C (N) in the CRB is 1 to 1. Both types of ordering structure coexist in the n = 3 compound, (Cu, C, N)-1223. In the last two members, (Cu, C, N)-1245 (n = 5) and (Cu, C, N)-1256 (n = 6), no evidence of ordering was observed, suggesting that Cu, C and N are distributed almost randomly in the CRBs. Such relations between the ordering scheme and n parameters are also observed locally in the crystals which contain many intergrowth defects. [References: 19]
机译：通过电子衍射检查了最近在Sr-Ca-Cu CNO系统中于5.6 GPa高压下制备的一系列新的碳氧碳酸盐超导体（Cu，C，N）Sr2Can-1CunOy（n = 1-6）。和高分辨率透射电子显微镜，以揭示电荷储存区（CRB）中Cu和C（N）的排列。在n = 1-4的化合物中观察到Cu和C（N）的有序排列，对于n = 5-6的化合物，几乎是无规排列。在前两个系列的化合物（Cu，C，N）-1201（n = 1）和（Cu，C，N）-1212（n = 2）中，-Cu-C（N）-的有序排列观察到C（N）-C（N）-Cu-具有四倍的周期性，这表明CRB中Cu与C（N）之比为1至3.对于（Cu，C，N）-1234（n = 4），在该系列的最高Tc为113 K的情况下，观察到具有两倍周期性的Cu C（N）-Cu-C（N）Cu的有序排列，表明CRB中Cu与C（N）之比是1到1。这两种类型的有序结构共存于n = 3的化合物（Cu，C，N）-1223中。在最后两个成员（Cu，C，N）-1245（n = 5）和（Cu，C，N）-1256（n = 6）中，没有观察到有序的迹象，表明Cu，C和N在CRB中几乎随机分布。在包含许多共生缺陷的晶体中也可以局部观察到排序方案和n个参数之间的这种关系。 [参考：19]

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