کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1331907 | 979022 | 2008 | 7 صفحه PDF | دانلود رایگان |
Ba(R,R′)2CuO5 (R,R′=lanthanides and Y) plays an important role as a flux-pinning agent in enhancing the superconducting properties of the Ba2(R,R′)Cu3O6+x (R,R′=lanthanides and Y) coated conductors. Using X-ray diffraction and neutron diffraction, we found that the Ba(NdxY2−x)CuO5 solid solution adopts two structure types. In the Nd-rich region (1.8⩽x⩽2.0), the materials are of brown color (commonly referred to as the ‘brown phase’), and the structure is tetragonal with space group I4/mbm (no. 127). In the Y-rich region (0.0⩽x⩽1.4), the materials are green (commonly referred to as the ‘green phase’) and the structure is orthorhombic with space group Pnma (no. 62). A two-phase region (1.4 Perspective view of the “green phase” Ba(NdxY2−x)CuO5 structure along the b-axis, showing the isolated square pyramids of [CuO5] and the trigonal prisms, RO7, around the lanthanide sites.Figure optionsDownload as PowerPoint slide
Journal: Journal of Solid State Chemistry - Volume 181, Issue 12, December 2008, Pages 3236–3242