中国物理B ›› 1995, Vol. 4 ›› Issue (6): 448-456.doi: 10.1088/1004-423X/4/6/007
潘国强1, S. MEGTERT2, G. COLLIN3
PAN GUO-QIANG (潘国强)a, G. COLLINb, S. MEGTERTc
摘要: We have investigated, by X-ray diffraction, a series of single crystals of Bi-based oxides with the nominal composition Bi2Sr2(Cu1-zFez)O6+δ(0≤z≤0.55). In this system we observed two structural phase transitions with the increase of the doping content. The first transition, from an incommensurate monoclinic phase to an incommensurate orthorhombic phase, occurs at a doping content of iron zFe=0.027. The second one corresponds to a phase transition from an incommensurate orthorhombic phase to a commensurate orthorhombic phase at zFe=0.34. The comparison of these results with those for more limited substitutions of Zn and Ni indicates the significant role of the insertion of the extra oxygen in the (Bi-O)∞ double layers.
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