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- W2350062504 abstract "Polycrystalline samples of BaBi_(1-x)Pb_ xO_3 in the composition rangex from 0 to 1 were prepared. Crystal structure and physical properties measurements were made on these samples. The powder X-ray diffraction confirmed that the samples were pure, and their crystal structure evolvedfrom monoclinic for 0 x 0.1, through orthorhombic in 0.1x 0.65 and tetragonal in 0.65.x 0.9, to orthorhombic in 0.9x 1.0. With the doping of plumbum, the lattice constants decreased continuously in the semiconducting range, while vibrated like sine wave in the superconducting range, which was ascribed to the replacement of Bi~ 5+ and Bi~ 3+ by Pb~ 4+ and the function of the breathing mode of Bi(Pb)O_ 6 . The temperature dependence of resistivity indicated that the electrical property of the samples, which was nearly independent of oxygen deficiency, was closelyconnected with the crystal structures and the growing environment. The optimum dopingwas x= 0.75 whose T_c was 9K. For the samples with semiconducting property, the resistivity could be explained by Mott′s VRH. The slope between lnρ and T~ -1/4 was decreased with increasing x, which implied the change of the states density and/or localization length. The metal-semiconductor transition could be explained by overlapping band. The result of Raman spectra indicated that the intensity of Raman spectrum was less affectedby the frequency of the incident beam. When increasing x, the number of the breathing mode of Bi(Pb)O_6 was reduced, and the crystal became disorder. T_c was independent of the deformation potential of Bi(Pb)O_ 6 , but was relative to its frequency." @default.
- W2350062504 created "2016-06-24" @default.
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- W2350062504 date "2005-01-01" @default.
- W2350062504 modified "2023-09-23" @default.
- W2350062504 title "EXPLORATION ON THE PHYSICAL PROPERTIES OF THE SYSTEM BaBi_(1-x)Pb_xO_3" @default.
- W2350062504 hasPublicationYear "2005" @default.
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