Investigation of giant dielectric and room temperature ferromagnetic response of facile CZTO nanostructure

Ghoshal, Debopriyo; Bhattacharya, Dhrubajyoti; Mondal, Dheeraj; Das, Santanu; Paul, Biplab Kumar; Basu, Mousumi; Das, Sukhen

doi:10.1007/s10854-019-01674-6

Cited by 6 publications

(2 citation statements)

References 42 publications

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“…Besides that, another important outcome can be seen from Figure 7(b) that EAMO has a lower tangent loss value than GAMO at every observed frequency, which is obvious due to having less polarization effect and low mobility of charge carriers on GAMO than EAMO. The change of AC conductivity of EAMO and GAMO samples as a function of frequency has been estimated [10] and demonstrated in Jonscher's power law can put more light on the frequency dependence of AC conductivity of EAMO and GAMO samples. The power law [16] describes as,…”

Section: In-depth Dielectric Behavior Studymentioning

confidence: 99%

“…Besides that, another important outcome can be seen from Figure 8(b) that EAMO has a lower tangent loss value than GAMO at every observed frequency, which is obvious due to having less polarization effect and low mobility of charge carriers on GAMO than EAMO. The change of AC conductivity of EAMO and GAMO samples as a function of frequency has been estimated [33] and demonstrated in In the low-frequency region for EAMO and GAMO samples, the total conductivity response is governed by a thermally agitated process in which the hopping of, both the free and weakly bound, charge carrier maintains a proper array under the influence of the external electric field and contributes to the σdc part. This nature can be explained in a way that with an increase in temperature, more and more energetic charge carriers are generated.…”

Section: In-depth Dielectric Behavior Studymentioning

confidence: 99%

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Theoretical and Experimental Observations on Empowered EMI Shielding of Rare Earth Ion Infused α-MnO 2 Nano-rods

Mondal

Bhattacharya

Mondal

et al. 2023

Preprint

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In this communication, for the first time rare earth elements like Gd3+ and Er3+ ions are impregnated into the α-MnO2 tunneled structure involving the modified chemical synthesis route followed by hydrothermal technique. X-ray diffraction patterns and Raman spectroscopy confirm the proper phase formation without any impurity. A theoretical in-depth DFT study for the electronic bands and variation of density of states with the infusion of rare earth elements into the host structure confirms the experimental findings and depicts the suitability of the material towards the EMI shielding application. The novel synthesis technique helps to achieve uniform nanorod formation with a high specific surface area. Doping-induced defects, high surface-to-volume ratio, Maxwell-Wagner–Siller interfacial polarization, etc lead to achieving high dielectric response with moderate tangent loss at frequency range 40Hz to 1MHz. Temperature-dependent dielectric behavior indicates the paramagnetic to ferromagnetic transition at 120 \(℃\) and 70 \(℃\) for the Gd- and Er-doped α-MnO2 samples respectively. The electromagnetic interference (EMI) shielding effectiveness (SE) has achieved a maximum of − 43 dB at 15.3 GHz and − 46 dB at 15.3 GHz for Gd- and Er-doped α-MnO2 thin layer of thickness ∼600 µm respectively. Higher dipolar polarization, loss tangent, conductive pathways, and defects inside the crystal lead to attaining a high EMI shielding efficiency. This result reveals > 99.999% EMI SE against the hazardous electromagnetic waves in the microwave/GHz frequency region.

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Section: In-depth Dielectric Behavior Studymentioning

confidence: 99%

Section: In-depth Dielectric Behavior Studymentioning

confidence: 99%