TY - JOUR
T1 - Relation of oxygen content and modulation structure in Bi2201 system
AU - Xu, Gaojie
AU - Mao, Zhiqiang
AU - Tian, Mingliang
AU - Zhou, Guien
AU - Wu, Ronghu
AU - Zhang, Yuheng
PY - 1997/6
Y1 - 1997/6
N2 - Two series of samples of Bi1.8Pb0.2Sr2CuOy and Bi1.9Sr1.6La0.4CuOy systems with different oxygen content were prepared. The microstructure of these samples was investigated by means of X-ray diffraction (XRD) and electron diffraction (ED). The analysis of XRD indicates that a progressive change in lattice parameters takes place with the removal of oxygen. The analysis of ED patterns reveals that for the Bi1.8Pb0.2Sr2CuOy system, the orthorhombic modulation (Pb-type modulation) is strongly related to the oxygen in Bi2O2 layers, which implies that the orthorhombic modulation is not compositional (Pb) modulation, and the periodic distribution of oxygen in Bi2O2 layers induced by Pb doping may be the real origin of orthorhombic modulation. While for the Bi1.9Sr1.6La0.4CuOy system, the monoclinic incommensurate modulation is independence of the variation of oxygen in Bi2O2 layers, which suggests that the intercalation or removal of extra oxygen atoms was only the result of the monoclinic modulation structure changing, and the crystal misfit between Bi2O2 layers and perovskite blocks was the real driving force of the Bi-concentrated band superstructural modulation.
AB - Two series of samples of Bi1.8Pb0.2Sr2CuOy and Bi1.9Sr1.6La0.4CuOy systems with different oxygen content were prepared. The microstructure of these samples was investigated by means of X-ray diffraction (XRD) and electron diffraction (ED). The analysis of XRD indicates that a progressive change in lattice parameters takes place with the removal of oxygen. The analysis of ED patterns reveals that for the Bi1.8Pb0.2Sr2CuOy system, the orthorhombic modulation (Pb-type modulation) is strongly related to the oxygen in Bi2O2 layers, which implies that the orthorhombic modulation is not compositional (Pb) modulation, and the periodic distribution of oxygen in Bi2O2 layers induced by Pb doping may be the real origin of orthorhombic modulation. While for the Bi1.9Sr1.6La0.4CuOy system, the monoclinic incommensurate modulation is independence of the variation of oxygen in Bi2O2 layers, which suggests that the intercalation or removal of extra oxygen atoms was only the result of the monoclinic modulation structure changing, and the crystal misfit between Bi2O2 layers and perovskite blocks was the real driving force of the Bi-concentrated band superstructural modulation.
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U2 - 10.1143/jjap.36.3474
DO - 10.1143/jjap.36.3474
M3 - Article
AN - SCOPUS:0031163151
SN - 0021-4922
VL - 36
SP - 3474
EP - 3477
JO - Japanese Journal of Applied Physics
JF - Japanese Journal of Applied Physics
IS - 6 A
ER -