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Debye to non-debye type relaxation in MoO3 doped glassy semiconductors: A portrait on microstructure and electrical transport properties.

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Title: Debye to non-debye type relaxation in MoO3 doped glassy semiconductors: A portrait on microstructure and electrical transport properties.
Authors: Halder, Prolay1 (AUTHOR), Bhattacharya, Sanjib1 (AUTHOR) sanjib_ssp@yahoo.co.in
Source: Physica B. Jan2023, Vol. 648, pN.PAG-N.PAG. 1p.
Subjects: Semiconductor doping, Current-voltage characteristics, Polarons, Microstructure, Dielectric relaxation, Copper oxide, Quenching (Chemistry)
Abstract: MoO 3 doped glassynanocomposites have been developed by melt quenching method. Micro-structural study reveals the distribution of CuO, Cu 2 O, ZnO and MoO 3 nanophases in the glassy matrices.AC conductivity spectra havestudied to reveal nonrandom and sub-diffusive motions of small polarons with a correlation with the network structures. It is significantly noted that as the MoO 3 content is slightly added to the base system, DC conductivity value goes up slightly first and then goes down. This type of variation should be associated with their microstructures.It is noteworthy from the present study that relaxation times are very low for glassy systems containing lower MoO 3 content and quite high for those containing higher MoO 3 content.This change over of relaxation times suggests a desirable transition from Debye type to non-Debye type relaxation, which has also been validated with estimated values of maximum barrier height (W M). Debye to non-Debye type relaxation has also been from the estimated β values as well as current-voltage characteristics. A schematic model has been proposed to interpret the nature of conduction. Only ZnOnanophasescan be regarded as the controlling factor of stability of the resultant glassy system as it contributes to phonon dispersions. • New MoO 3 doped ZnO - CuO glass-nanocomposites. • Various nanophases in the glassy matrices. • Nonrandom and sub-diffusive motions of small polarons with a correlation with the network structures. • Debye type to non-Debye type relaxation. • ZnO nanophases are the controlling factor of stability of the present system. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:MoO 3 doped glassynanocomposites have been developed by melt quenching method. Micro-structural study reveals the distribution of CuO, Cu 2 O, ZnO and MoO 3 nanophases in the glassy matrices.AC conductivity spectra havestudied to reveal nonrandom and sub-diffusive motions of small polarons with a correlation with the network structures. It is significantly noted that as the MoO 3 content is slightly added to the base system, DC conductivity value goes up slightly first and then goes down. This type of variation should be associated with their microstructures.It is noteworthy from the present study that relaxation times are very low for glassy systems containing lower MoO 3 content and quite high for those containing higher MoO 3 content.This change over of relaxation times suggests a desirable transition from Debye type to non-Debye type relaxation, which has also been validated with estimated values of maximum barrier height (W M). Debye to non-Debye type relaxation has also been from the estimated β values as well as current-voltage characteristics. A schematic model has been proposed to interpret the nature of conduction. Only ZnOnanophasescan be regarded as the controlling factor of stability of the resultant glassy system as it contributes to phonon dispersions. • New MoO 3 doped ZnO - CuO glass-nanocomposites. • Various nanophases in the glassy matrices. • Nonrandom and sub-diffusive motions of small polarons with a correlation with the network structures. • Debye type to non-Debye type relaxation. • ZnO nanophases are the controlling factor of stability of the present system. [ABSTRACT FROM AUTHOR]
ISSN:09214526
DOI:10.1016/j.physb.2022.414374