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Experimental and Computational Study of the Microwave Absorption Properties of Recycled α-Fe2O3/OPEFB Fiber/PCL Multi-Layered Composites

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Journal of Materials Science and Chemical Engineering 2022年第3期10卷 30-41页

作者： Ebenezer Ekow Mensah raba’ah syahidah azis Zulkifly Abbas Department of Integrated Science Education Faculty of Science Education Akenten Appiah-Menka University of Skills Training and Entrepreneurial Development Mampong Ashanti Ghana Department of Physics Faculty of Science Universiti Putra Malaysia Selangor Malaysia Institute of Advanced Materials Universiti Putra Malaysia Selangor Malaysia

The aim of this study was to fabricate multi-layered recycled α-Fe2O3/OPEFB fiber/PCL composites for microwave absorbing applications in the 1 - 4 GHz frequency range. The multi-layered composites were 6 mm thick and each consisted of a 2 mm thick layer of recycled α-Fe2O3/PCL composites at various loadings (5 wt% - 25 wt%) of 16.2 nm recycled α-Fe2O3 nanofiller, placed between two layers of 2 mm thick OPEFB fiber/PCL composites blended at a fixed ratio of 7:3. The real (ε') and imaginary (ε") components of the relative complex permittivity were measured using the open-ended coaxial probe technique and the values obtained were applied as inputs for the Finite Element Method to calculate the reflection coefficient magnitudes from which the reflection loss (RL) properties were determined. Both ε' and ε" increased linearly with recycled α-Fe2O3 nanofiller content and the values of ε' varied between 3.0 and 3.9 while the ε" values ranged between 0.26 and 0.64 within 1 - 4 GHz. The RL (dB) showed the most prominent values within the 1.38 - 1.46 GHz band with a minimum of -38 dB attained by the 25 wt% composite. Another batch of minimum values occurred in the 2.39 - 3.49 GHz range with the lowest of -25 dB at 2.8 GHz. The recycled α-Fe2O3/OPEFB fiber/PCL multi-layered composites are promising materials that can be engineered for solving noise problems in the 1 - 4 GHz range.

关键词： Multi-Layered Composites Recycled α-Fe2O3 Reflection Loss OPEFB Fiber Relative Complex Permittivity

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Morphology and dielectric properties of single sample Ni_(0.5)Zn_(0.5)Fe_(2)O_(4)nanoparticles prepared via mechanical alloying

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Journal of Advanced Ceramics 2014年第4期3卷 306-316页

作者： Rafidah HASSAN Jumiah HASSAN Mansor HASHIM Suriati PAIMAN raba′ah syahidah azis Physics Department Faculty of ScienceUniversiti Putra Malaysia43400 UPM SerdangSelangorMalaysia Institute of Advanced Technology University Putra Malaysia43400 UPM SerdangSelangorMalaysia

Nickel-zinc ferrite nanoparticles are important soft magnetic materials for high and low frequency device application and good dielectric ***-zinc ferrite nanoparticles with composition Ni_(0.5)Zn_(0.5)Fe_(2)O_(4)were prepared using mechanical alloying to analyze the effect of sintering temperature on microstructure evolution of a single sample with dielectric *** single sample with nanosized pellet was sintered from 600℃to 1200℃and analyzed by X-ray diffraction(XRD)to investigate the phases of the powders and by field emission scanning electron microscopy(FESEM)for the morphology and microstructure *** properties such as dielectric constant(e″)and dielectric loss(e′)were studied as functions of frequency and temperature for Ni_(0.5)Zn_(0.5)Fe_(2)O_(4).The dielectric properties of the sample were measured using HP 4192A LF impedance analyzer in the low frequency range from 40 Hz to 1 MHz and at temperature ranging from 30℃to 250℃.The results showed that single phase Ni_(0.5)Zn_(0.5)Fe_(2)O_(4)cannot be formed by milling alone and therefore requires *** crystallization of the ferrite sample increased with increasing sintering temperature,while the porosity decreased and the density and average grain size *** of the microstructure resulted in three activation energies of grain growth,where above 850℃there was a rapid grain growth in the *** constant and loss factor decreased with the increase in *** optimum sintering temperature of Ni_(0.5)Zn_(0.5)Fe_(2)O_(4)was found to be 900℃which had high dielectric constant and low dielectric loss.

关键词： mechanical alloying sintering temperature dielectric properties

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Complex dielectric modulus and relaxation response at low microwave frequency region of dielectric ceramic Ba_(6-3x)Nd_(8+2x)Ti_(18)O_(54)

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Journal of Advanced Dielectrics 2014年第4期4卷 57-64页

作者： Chian Heng Lee Jumiah Hassan Mansor Hashim raba'ah syahidah Aziz Norlaily Mohd Saiden Department of Physics Universiti Putra Malaysia 43400 Serdang SelangorMalaysia Institute of Advanced Technology Universiti Putra Malaysia 43400 Serdang Selangor Malaysia

The desirable characteristics of Ba_(6-3x)Nd_(8+2x)Ti_(18)O_(54)include high dielectric constant,low loss tangent,and high quality factor developed a new field for electronic *** microwave dielectric properties of Ba_(6-3x)Nd_(8+2x)Ti_(18)O_(54),with x?0:15 ceramics at different sintering temperatures(600–1300C)were *** phenomenon of polarization produced by the applied electric field was *** dielectric properties with respect to frequency from 1MHz to 1.5 GHz were measured using Impedance Analyzer,and the results were compared and *** highest dielectric permittivity and lowest loss factor were defined among the *** complex dielectric modulus was evaluated from the measured parameters of dielectric measurement in the same frequency range,and used to differentiate the contribution of grain and grain boundary.

关键词： Ceramic sintering dielectric response electrochemical impedance spectroscopy

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