,Electrical Properties and Raman Spectra of BaBi1-xPbxO3

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Crystal structure, electrical properties and Raman spectra of BaBi1-xPbx O3 are reported. The result of x-ray diffraction shows that the specimen is pure, and the lattice parameters decrease continuously in the semicon-ducting range, whereas it vibrates similarly to a sine wave in the superconducting range, which is ascribed to the existence of oxygen vacancies and the function of breathing modes of Bi(Pb)O6. The temperature dependence of resistivity indicates that the electrical property of the samples is connected sensitively with the crystal struc-tures. Raman spectra show that the specimen becomes disorder when x increases, and the critical temperature TC depends not only on the deformation potential of the soft A1g mode derived from the Bi(Pb)O6 rigid rotation,but also on the energy shift of the mode.
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