Magnetic, electrical and microwave properties of Mn–Co substituted Ni x Zn 0,8-x Fe 2 O 4 nanoparticles

Sözeri, H.; Genç, F.; Ünal, B.; Baykal, A.; Aktaş, B.

doi:10.1016/j.jallcom.2015.11.123

Cited by 35 publications

(4 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…First, perfect EM wave absorption properties depend on the impedance matching characteristics of composites, which are inuenced by permittivity and permeability. 7,8 If there are clear differences between the values of permittivity and permeability, the EM wave can be reected from the surface of the composites. In contrast, the EM wave can pass through the surface with slight reection and then, it enters into the composites with strong absorption.…”

Section: Resultsmentioning

confidence: 99%

“…12,13 Moreover, there are a number of gaps and defects in PANI molecular chains, which can introduce dipole polarization. 18,20,25 The dipole polarization and interfacial polarization can enhance the electromagnetic loss and improve the EM wave absorption. Third, the PANI chains can form a conductive network due to their reasonable conductivity and intensive distribution, which can be benecial for the transfer of the EM wave.…”

Section: Resultsmentioning

confidence: 99%

“… 6 For example, Xie et al 7 synthesized (Ni 0.407 Co 0.207 Zn 0.386 )Fe 2 O 4 ferrite that exhibited an effective absorption frequency band (reflection loss below −10 dB) from 8.64 to 11.2 GHz. In another report, Sozeri et al 8 studied Mn–Co-substituted Ni–Zn ferrite nanoparticles with a simple format Ni x Zn 0.8− x Mn 0.1 Co 0.1 Fe 2 O 4 (0 ≤ x ≤ 0.8), and the results showed that Ni 0.6 Zn 0.2 Mn 0.1 Co 0.1 Fe 2 O 4 has the best EM wave absorption properties with the maximum reflection of −25 dB at frequency 10 GHz. In that study, Ni–Zn–Co ferrite was used due to its high magnetic loss, and EM wave was absorbed by eddy current loss, hysteresis loss and natural resonance.…”

Section: Introductionmentioning

confidence: 90%

“…24 The characteristic peaks at 1306 and 1233 cm À1 indicate the C-N stretching vibration of benzenoid ring. 24,25 The distinct peak at 1150 cm À1 is described as"electronic-like band", 26 which is assigned to the N ¼ Q ¼ N mode (Q on behalf of the quinonictype rings). The PANI/ZNCF composites exhibit both PANI and ZNCF characteristic peaks, whereas there is a clear shi at 564 cm À1 because the PANI chains are tightly covered with ZNCF.…”

Section: Characterizationmentioning

confidence: 99%

See 3 more Smart Citations

The effect of polymerization temperature and reaction time on microwave absorption properties of Co-doped ZnNi ferrite/polyaniline composites

Lei

Yao

et al. 2018

RSC Adv.

View full text Add to dashboard Cite

This study presents the systematic potential effects of reaction parameters on the synthesis of Co-doped ZnNi ferrite/polyaniline composites prepared via novel interfacial polymerization. Through intensive experiments and analysis, optimum reaction conditions including the polymerization temperature and reaction time are proposed so that the performance of the material is significantly improved. The structure, functional groups and morphologies of composites are investigated by X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), Fourier transform-infrared (FT-IR) spectroscopy, scanning electron microscopy (SEM) and high resolution transmission electron microscopy (HRTEM). In addition, the electromagnetic properties and microwave absorption properties of Co-doped ZnNi ferrite/ polyaniline composites are examined by a vibrating sample magnetometer (VSM), Quantum Design (MPMS-VSM and MPMS-XL), the superconducting quantum interference device (SQUID) magnetometer and vector network analysis. Based on these analyses, it is found that by tuning the reaction conditions, i.e., polymerization temperature and reaction time, microwave absorption capabilities in terms of the maximum reflection loss (R L ) value and absorber thickness can be readily optimized. The results show that the composite with an optimized polymerization condition of 20 C for 12 h displays remarkable microwave absorption properties with maximum reflectivity of À54.3 dB, and the effective bandwidth (R L < À10 dB) is about 6.02 GHz at a thickness of 6.8 mm. Furthermore, the discussion shows that the promising microwave absorption may be due to the uniform urchin-like structure of the composites.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%