Study of Electrical Transport of Ag2O – CdO – MoO3 Glass-Nanocomposite-Semiconductor

摘要

Two series of semiconducting glass-nanocomposites xAg2O – (1-x) (0.1CdO – 0.9 MoO3) and 0.3 Ag2O – 0.7 (yCdO – (1-y) MoO3) is prepared by melt-quenching route. The formation of Ag2MoO4, Ag2Mo2O7 and Ag6Mo-_(10)O_(33) nanocrystallites and CdO nanoparticles in glass-nanocomposites is confirmed by the study of X-ray diffraction (XRD) and field emission- scanning electron microscopic (FE-SEM). The Fourier transform infrared (FT-IR) spectra are being taken to find out stretching vibrations of monomeric tetrahedral orthomolybdate ion MoO_4~(2-) as well as stretching vibrations of Mo2O_7~( 2-) ions. Micro-hardness of the as-prepared samples is found to increase with load and shows a maximum for a particular load for different methods (Vicker’s and Knoop’s) and different compositions. The dc conductivity is described based on the polaron hopping approach to a wide temperature range. The variable range hopping Mott’s (Greave’s) model is employed to analyze the conductivity data at low (high) temperatures. The frequency exponent data show that ac conductivity is consistent with overlapping large polaron-tunnelling (OLPT) model at all temperature.