Elastic study and optical dispersion characterization of Fe-substituted cobalt aluminate nanoparticles

Bakeer, D. El-Said

doi:10.1007/s00339-020-03625-z

Cited by 10 publications

(1 citation statement)

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“…Among of absorption peaks observed between (404–518 cm −1 ) which corresponds to the active modes of ZnO related to hexagonal structure [ 58 , 59 ]. The number of peaks is higher for (Fe + Cu) samples as compared to (Fe + Ni) samples for both series, see S8 for each series.…”

Section: Resultsmentioning

confidence: 99%

Structural, FTIR spectra and optical properties of pure and co-doped Zn1-x-yFexMyO ceramics with (M = Cu, Ni) for plastic deformation and optoelectronic applications

et al. 2021

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We report here a considered novel study on the structural, FTIR spectra and optical properties of pure and co-doped Zn 0.90- x Fe 0.1 M x O with ((M = Cu, Ni and ( x = 0.00, 0.10) and (0.00 < y < 0.20)) at different sintering temperatures T s ( T s = 850 °C for series I and 1000 °C series II). Although the ZnO wurtzite structure is conformed for all samples, some secondary lines with little intensity are formed. But the number of these lines is higher for series I than for series II. The ( c / a ) value and U -parameter are almost constant for all samples, while Zn–O bond length L is slightly increased. The porosity and crystallite size are decreased by Fe, and also for (Fe + Cu) samples, and their values for series I are lower than for series II. The residual stress is tensile for most samples. Interestingly, the Young’s, rigid and bulk modulus, Poisson’s ratio and Debye temperature, obtained from FTIR analysis, are increased by Fe addition with a further increase for Fe + Ni) samples for both series. A ductile nature is obtained for pure, Fe and (Fe + Cu) samples; whereas a brittle nature is approved for (Fe + Ni) samples. On the other hand, the energy gap ( E g ), residual lattice dielectric constant ( ε L ) and carrier density N are increased by Fe addition, followed by a further increase for (Fe + Cu) samples, while the vice is versa for the inter-atomic distance R . For example, E g was increased from 3.153 eV for pure ZnO to 3.974 eV for (Fe + Cu) samples (i.e., 0.821 eV more), while it was decreased to 2.851 eV for (Fe + Ni) samples (i.e., 0.302 eV less). A direct behavior is obtained between E g and both elastic modulus ( Y , β ), lattice and micro strains ( ε L , ε m ) , dislocation density ( δ ), residual stress ( σ ) and carrier density N, whereas a reverse behavior is obtained between E g and both crystallite size ( D ), porosity (PS) and inter-atomic distance ( R ) . These results are explained in terms of the generated blocked states of the conduction band as indicated by the Burstein Moss effect. These novel findings reveal that the co-doping has intense ZnO and moderate metal oxide modes in the ZnO matrix structure, which makes ZnO co-doped with (Fe + Cu) more suitable for gas sensors and optoel...

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Section: Resultsmentioning

confidence: 99%