TY - JOUR
T1 - Relation of the superstructure modulation and extra-oxygen local-structural distortio
AU - Zhiqiang, Mao
AU - Gaojie, Xu
AU - Shuyuan, Zhang
AU - Shun, Tan
AU - Bin, Lu
AU - Mingliang, Tian
AU - Chenggao, Fan
AU - Cunyi, Xu
AU - Yuheng, Zhang
PY - 1997
Y1 - 1997
N2 - The modulated structure of (Formula presented)(Formula presented)(Formula presented)(Formula presented)(Formula presented) (y=0.2, n0.4;n0.1⩽x⩽1.0) was studied by means of electron diffraction. The experimental data show that the modulated structure changes from a mixed Bi/Pb-type to a pure Bi-type modulation with an increasing amount of La content in both the y=0.2 and 0.4 series and that the periodicity of the Bi-type modulation decreases correspondingly. When x=1.0, the modulation exhibits nearly the same characteristic in the samples with y=0.2 and 0.4. In addition, the extra-oxygen behavior, together with the local-structural distortion characteristic, related to the change of the modulated structure was also examined with Raman scattering, x-ray photoelectron spectroscopy and high-resolution electron micro- graphy. The experiment results reveal that there are more extra-oxygen atoms intercalating in the (Formula presented)(Formula presented) layers with a decrease in the modulation periodicity in the y=0.2 series. However, for the y=0.4 series, no more extra oxygen is incorporated into the (Formula presented)(Formula presented) layers with a decrease in the modulation periodicity, but the degree of local-structural distortion strengthens markedly in the (Formula presented)(Formula presented) layers. Based on these experiment results, we discuss the relationship of the superstructure modulation, extra oxygen, and the local-structural distortion.
AB - The modulated structure of (Formula presented)(Formula presented)(Formula presented)(Formula presented)(Formula presented) (y=0.2, n0.4;n0.1⩽x⩽1.0) was studied by means of electron diffraction. The experimental data show that the modulated structure changes from a mixed Bi/Pb-type to a pure Bi-type modulation with an increasing amount of La content in both the y=0.2 and 0.4 series and that the periodicity of the Bi-type modulation decreases correspondingly. When x=1.0, the modulation exhibits nearly the same characteristic in the samples with y=0.2 and 0.4. In addition, the extra-oxygen behavior, together with the local-structural distortion characteristic, related to the change of the modulated structure was also examined with Raman scattering, x-ray photoelectron spectroscopy and high-resolution electron micro- graphy. The experiment results reveal that there are more extra-oxygen atoms intercalating in the (Formula presented)(Formula presented) layers with a decrease in the modulation periodicity in the y=0.2 series. However, for the y=0.4 series, no more extra oxygen is incorporated into the (Formula presented)(Formula presented) layers with a decrease in the modulation periodicity, but the degree of local-structural distortion strengthens markedly in the (Formula presented)(Formula presented) layers. Based on these experiment results, we discuss the relationship of the superstructure modulation, extra oxygen, and the local-structural distortion.
UR - http://www.scopus.com/inward/record.url?scp=0037871283&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0037871283&partnerID=8YFLogxK
U2 - 10.1103/PhysRevB.55.9130
DO - 10.1103/PhysRevB.55.9130
M3 - Article
AN - SCOPUS:0037871283
SN - 1098-0121
VL - 55
SP - 9130
EP - 9135
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
IS - 14
ER -