The synthesis of new phases related to YBCO by complete replacement of the chain copper sites

Greaves C.; Slater P.R.

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The synthesis of new phases related to YBCO by complete replacement of the chain copper sites

机译：通过完全取代链铜位点合成与YBCO有关的新相

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The extent to which new phases may be synthesized by the replacement of the chain Cu sites (Cu1) in the YBa/sub 2/Cu/sub 3/O/sub 7/ structure was examined. Several new phases have been prepared, and it is demonstrated that, for cations which preferentially substitute at this site, it becomes possible to prepare phases in which the Ba cations have been totally replaced by Sr, e.g. EuSr/sub 2/Cu/sub 2/NbO/sub 8/. All phases of this type are tetragonal, and, using Rietveld refinement techniques and powder X-ray diffraction data, it has been confirmed that the Nb occupies only the Cu1 position and adopts octahedral coordination in EuSr/sub 2/Cu/sub 2/NbO/sub 8/. Phases involving other substituting cations are also discussed. Superconductivity has not been observed in these phases.

机译：研究了通过替换YBa / sub 2 / Cu / sub 3 / O / sub 7 /结构中的铜链位点（Cu1）可以合成新相的程度。已经制备了几个新的相，并且证明了，对于优先在该位点取代的阳离子，可以制备其中Ba阳离子已被Sr例如Sr完全取代的相。 EuSr / sub 2 / Cu / sub 2 / NbO / sub 8 /。这种类型的所有相都是四方的，并且使用Rietveld精炼技术和粉末X射线衍射数据，已证实Nb仅占据Cu1位置，并且在EuSr / sub 2 / Cu / sub 2 / NbO中采用八面体配位/ sub 8 /。还讨论了涉及其他取代阳离子的相。在这些阶段还没有观察到超导性。

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《IEEE Transactions on Magnetics》 |1991年第2期|P.1174-1177|共4页
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Greaves C.; Slater P.R.;
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The synthesis of new phases related to YBCO by complete replacement of the chain copper sites

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