Article
Materials Science, Ceramics
Esmaeil Mohebbi, Saeed Hasani, Mohsen Nouri-Khezrabad, Abolfazl Ziarati
Summary: The study aims to enhance the properties of M-type barium hexaferrite nano-particles through the addition of natural agent agarose. Various analyses were conducted to characterize the synthesized samples. The presence of agarose improved the distribution of metal cations, reduced particle size, prevented agglomeration, increased coercivity and remanence magnetization, and resulted in an increased maximum energy product.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
Pawan Kumar, Sitender Singh, Isha Gupta, Anuj Dalal, Vinod Kumar, Devender Singh
Summary: Single-phased cool green light emissive Gd3-xAl5O12:xTb3+ (x = 0.01-0.06) nanophosphors were prepared via a less time consuming, ecological, low-temperature based gel-combustion technique. The samples were characterized by X-ray diffraction, morphological observations, FTIR analysis, elemental composition, and photo-luminescence measurements. The optimized sample (x = 0.04) showed high color purity and cool green emission, making it a potential applicant for solid state lighting applications.
MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Pawan Kumar, Sitender Singh, Isha Gupta, Kapeesha Nehra, Vinod Kumar, Devender Singh
Summary: Single-phased Gd3-xAl5O12:xDy3+(x = 0.01-0.07) nanophosphors emitting cool white light were synthesized via gelcombustion method. The samples exhibited a single cubic phase with a space group of Ia-3d (230) based on diffraction data and Rietveld results. The synthesized phosphors showed intense blue and yellow emission at 482 nm and 576 nm respectively, and were identified as potential candidates for white-LED applications.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Chemistry, Physical
M. M. Shehata, S. A. Waly, O. Farid, O. Ghazy, Z. I. Ali
Summary: A series of manganese-cadmium nanoferrites were synthesized using the sol-gel combustion method, and their structural and magnetic properties were studied with gamma-ray irradiation. The results showed that an increase in Cd2+ ion concentration and gamma-ray dose led to a decrease in remnant and saturation magnetization.
RADIATION PHYSICS AND CHEMISTRY
(2021)
Article
Materials Science, Multidisciplinary
Bassam Hasanain
Summary: Nanoferrites, particularly spinel ferrites, are crucial in solving global electronic and microwave device challenges due to their outstanding structural, morphological, and dielectric properties. Through the auto combustion (sol-gel) route, nanoferrites with a composition formula of Zn Mg-0.5-x(0.25+x ) Co Cr-0.25(1-x ) Fe (1+x ) O (4) (ZMCCF), where x varies from 0 to 0.5 with a difference of 0.25, were synthesized. The variations in x resulted in promising changes in the structural, thermal, and dielectric responses of the designed nanoferrites. According to Koop's theory, the dielectric constant decreases as the frequency increases, which is a favorable trend for spinel ferrites. The different distribution of cations in the spinel structure supports this behavior, and the maximum tangent loss at low frequencies reflects the potential application of these materials in medium-frequency devices. Therefore, the planned spinel nanoferrites have the potential to significantly benefit advanced electronics and microwave devices.
MATERIALS RESEARCH EXPRESS
(2023)
Article
Physics, Condensed Matter
Sachin Kumar Godara, Mandeep Singh, Varinder Kaur, S. B. Narang, Jahangeer Ahmed, Ashwanu Kumar Sood
Summary: The synthesis of Sr1-xCaxFe12O19 samples via a sol-gel auto combustion process is reported, and the samples' properties were characterized. It was found that single-phase formation occurred at low temperatures, and the lattice parameters and cell volume decreased with increasing Ca content. The samples exhibited excellent magnetic properties.
PHYSICA B-CONDENSED MATTER
(2022)
Article
Optics
T. G. Vijay Kumar, K. Munirathnam, C. Parthasaradhi Reddy, S. Thiyagaraj, K. N. Venkatachalaiah, P. C. Nagajyothi
Summary: Artificial light sources are necessary for plant growth in locations with insufficient sunlight. This study prepared Eu-doped SrZr4(PO4)6 phosphors emitting blue, red, and far-red light, which could potentially be used in WLEDs for plant growth. The phosphors showed strong emissions at specific wavelengths under excitation, suitable for the photosynthesis process.
Article
Materials Science, Multidisciplinary
Bandi Sreematha, N. Arundhathi, D. Ravinder
Summary: NiGdXFe2-XO4 (X = 0.0-0.040 with a variation of 0.010) nanocrystalline materials were fabricated via the citrate-gel auto-combustion method. XRD confirmed the crystalline phase, and the Debye-Scherrer formula determined the crystalline size ranging from 26.71 to 18.79 nm. Variation in lattice parameter indicated adherence to Vegard's law. SEM images showed nanometer-sized particles and agglomerated structures. FTIR spectrum revealed tetrahedral and octahedral bands based on stretching frequencies. Dielectric properties, including AC conductivity, impedance, dielectric permittivity, and dielectric loss, were measured using LCR meters. AC conductivity increased with temperature and dopant concentration. Cole-cole plots exhibited semi-circle behavior, which was explained by grain and grain boundary effects. The decrease in dielectric constant and dielectric loss with increasing frequency was described by Koop's theory.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
Atta Ur Rehman, Nasir Amin, Muhammad Bilal Tahir, Muhammad Ajaz Un Nabi, N. A. Morley, Meshal Alzaid, Mongi Amami, Maria Akhtar, Muhammad Imran Arshad
Summary: The present study successfully synthesized Zn0.75Cu0.25Fe2O4 samples powder doped with RE3+ (La3+ and Ce3+) and Co2+. Various methods were utilized to analyze the structure, crystallite size, and absorption characteristics of the samples. The Co-Ce doped ZCF sample exhibited higher resistivity and showed different dielectric behaviors at different frequencies.
MATERIALS CHEMISTRY AND PHYSICS
(2022)
Article
Chemistry, Physical
Jefferson A. Lopes Matias, Evanimek B. Sabino da Silva, Rafael A. Raimundo, Djalma Ribeiro da Silva, Joao B. L. Oliveira, Marco A. Morales
Summary: Nanocrystalline Co sillenite-Co3O4 composites were prepared by combustion and sol-gel methods, and further characterized by various techniques. The sillenite phase exhibited nanostructured with similar content in products from both synthesis methods, showing both ferromagnetic and antiferromagnetic properties.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Inorganic & Nuclear
Shrikant M. Suryawanshi, Kamlesh Chandekar, Dilip S. Badwaik, Vijay V. Warhate, Nomdeo M. Gahane, Sarang R. Daf
Summary: Multi-metal spinel ferrite nanocrystals of Ni0.3Cu0.3Zn0.4Fe1.4Cr0.6O4 were synthesized using sol-gel auto-combustion route. The structural, magnetic, and dielectric properties of the nanocrystals were affected by calcination temperature. The prepared nanocrystals exhibited different crystallite sizes, lattice strains, dislocation densities, saturation magnetizations, retentivities, coercivities, magnetic anisotropies, dielectric constants, dielectric losses, conductivity values, and impedance values at low-frequency range. These nanocrystals have potential applications in capacitors, recording systems, high-frequency devices, and multilayer chip inductors.
INORGANIC CHEMISTRY COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
P. Himakar, K. Jayadev, D. Parajuli, N. Murali, Paulos Taddesse, S. Yonatan Mulushoa, Tulu Wegayehu Mammo, B. Kishore Babu, V. Veeraiah, K. Samatha
Summary: Nanoferrites of Co0.5Mg0.5-xCuxFe2O4 (x=0.0, 0.2 and 0.4) were prepared by sol-gel auto-combustion method and exhibited single-phase spinel cubic crystal structure with good ferrimagnetic behavior. The DC resistivity decreased with increasing copper content, while VSM study confirmed their isotropic nature forming single domains ferrimagnetic particles. The average crystallite sizes ranged from 38.8 to 49.9 nm.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Pradipta Chakraborty, Soumen Basu
Summary: Erbium doping in YCO nanoparticles leads to a decrease in band gap, changes in dc conductivity and dielectric permittivity, as well as a relaxor-like ferroelectric phase transition and magnetic ordering. These effects are essential for the successful application of YCO nanoparticles in devices.
MATERIALS CHEMISTRY AND PHYSICS
(2021)
Article
Chemistry, Physical
Vasyl Mykhailovych, Andrii Kanak, Stefana Cojocaru, Elena-Daniela Chitoiu-Arsene, Mircea Nicolae Palamaru, Alexandra-Raluca Iordan, Oleksandra Korovyanko, Andrei Diaconu, Viorela Gabriela Ciobanu, Gabriel Caruntu, Oleh Lushchak, Petro Fochuk, Yuriy Khalavka, Aurelian Rotaru
Summary: In this study, spinel-type MgCr2O4 nanoparticles were synthesized using a sol-gel auto-combustion method with fructose, tartaric acid, and hexamethylenetetramine as chelating/fuel agents. The formation of impurity-free MgCr2O4 nanostructures was optimal at temperatures ranging from 500 to 750 degrees C. Characterization techniques such as FTIR, UV-VIS spectrophotometry, XRD, EDX, and FE-SEM were used to study the properties of the synthesized nanoparticles, revealing the importance of the chelating/fuel agent nature and energy release during auto-combustion on the final properties of MgCr2O4 nanoparticles.
Article
Chemistry, Physical
Enas A. Arrasheed, Yamen A. Alibwaini, T. M. Meaz, Rizk Mostafa Shalaby, B. Salem, Abdul-Wali Ajlouni, H. H. El-Bahnasawy, O. M. Hemeda, A. M. A. Henaish
Summary: This study investigates the influence of Al substitution in Ni ferrite on the structure and electrical resistivity of NiAlxFe2-xO4 nanoparticles. With increasing Al content, the electrical resistivity of Ni-Al ferrites increases, exhibiting typical semiconductor behavior.
JOURNAL OF MOLECULAR STRUCTURE
(2021)
Article
Materials Science, Ceramics
Bo Zhang, Ibrahim Mahariq, Ngo Tran, Mustafa Z. Mahmoud, Majid Niaz Akhtar
Summary: A magnetic core-double shells structured composite has been developed to protect the core from oxidation and improve complex permittivity. The composite showed significant performance in terms of reflection loss and effective absorption bandwidth, with maximum dissipation capacity of -32.5 dB at 16.5 GHz. Enhancements in microwave dissipation arise from synergistic influences of various phenomena such as interfacial polarization and proper impedance matching.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
Muhammad Yousaf, Shoaib Nazir, Muhammad Akbar, Majid Niaz Akhtar, Asma Noor, Enyi Hu, M. A. K. Yousaf Shah, Yuzheng Lu
Summary: In this study, rare earth-doped Gd oxide in mixed Co-Mn spinel ferrite nanoparticles was synthesized using a sol-gel autocombustion approach. The magnetic and electrical properties decreased with increasing Gd3+ ion content, but the samples exhibited semiconducting behavior.
CERAMICS INTERNATIONAL
(2022)
Article
Physics, Condensed Matter
Muhammad Aamir, Waqas Aleem, Majid Niaz Akhtar, Aamir Alaud Din, Ghazala Yasmeen, Muhammad Naeem Ashiq
Summary: In this study, Co-Zr doped Ni ferrite substituted polyaniline (PANI) nanocomposites were prepared using a polymerization reaction method, and their photocatalytic efficiency was evaluated through a series of characterization experiments. The results confirmed the potential application of the prepared PANI/NiFeCo0.5Zr0.5O4 nanocomposites as suitable photocatalysts for the removal of methyl orange in aqueous media.
PHYSICA B-CONDENSED MATTER
(2022)
Article
Materials Science, Ceramics
Majid Niaz Akhtar, Muhammad Shahid Nazir, Muhammad Azhar Khan, Sami Ullah, Mohammed Ali Assiri
Summary: Ca-doped Ni-Mg-Mn spinel ferrites exhibit excellent thermal, spectral, structural, and magnetic properties, making them suitable for applications in switching, filters, inductors, and microwave absorption.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
Yang Zhang, Fei Dai, Abir Mouldi, Belgacem Bouallegue, Majid Niaz Akhtar
Summary: This research demonstrates the potential of enhancing microwave absorption performance by adjusting the microstructure and absorber design. By synthesizing hierarchical CuS and spherical NiCo2O4 particles, the researchers achieved the minimum reflection loss values at specific thickness and arrangement.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
Yinhe Lin, Majid Niaz Akhtar, Nidal H. Abu-Hamdeh, Smain Bezzina, Hoi Huynh Tan, Zhe Wang
Summary: A flower-like MoS2 (D) and Ni microsphere (M) composite absorber was successfully fabricated and showed synergistic performance in terms of absorption efficiency and reflection loss, suitable for microwave absorption applications.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
Min Ji, Pengfei Ji, Sadok Mehrez, Sagr Alamri, Majid Niaz Akhtar
Summary: The current study describes the fabrication and analysis of a bi-layer microwave absorber made of magnetic Sr2FeReO6 (SRO) powder and a magnetoelectric nanocomposite formed of rod-like magnetic Sr2FeReO6 powder wrapped in polygonal SnS2 powder (SRSS). The analysis showed that successful synthesis of rod and polygonal particles with soft magnetic properties was achieved. The designed bi-layer absorber exhibited broad X-band frequency absorption capabilities, with a reflection loss of -33 dB at 10.3 GHz and a thickness of only 2.5 mm.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Ceramics
Muhammad Azhar Khan, Sohail Afzal, Shagufta Gulbadan, Khalid Mahmood, Ghulam Abbas Ashraf, Majid Niaz Akhtar
Summary: Nano-crystalline Gd-substituted X-type hexaferrites with different Gd concentrations were synthesized and their properties were studied. X-ray diffraction confirmed the single and pure phases of hexagonal ferrites. The dielectric properties showed frequency dependence and suggested potential applications in high-frequency devices and supercapacitors. Raman spectra and SEM images further supported the findings.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Physical
Muhammad Rafaqat, Ghulam Ali, Naveed Ahmad, Syed Hassan Mujtaba Jafri, Shahid Atiq, Ghulam Abbas, Ghulam M. Mustafa, Rizwan Raza
Summary: This study reports the synthesis of La and Ba substituted X0.5Sr0.5Co0.8Mn0.2O3 and their investigation as a low temperature solid oxide fuel cell. The results show that the fuel cell based on LSCM cathode has significantly higher values of power density and open circuit voltage (VOC), indicating its potential for future applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Physics, Condensed Matter
Raees M. Asif, Abdul Aziz, Majid Niaz Akhtar, M. Amjad, Muhammad Azhar Khan
Summary: In this study, a Terbium doped Nickel-Zink nano-ferrite material was prepared and used as a substrate in a dual-band yagi-Uda-shaped 4 x 4 multi input multi output antenna. The properties of the ferrite material were evaluated using XRD, VSM, and SEM analysis. The MIMO antenna demonstrated improved performance in terms of size, bandwidth, isolation, and Channel Capacity Loss when compared to conventional FR4 substrates.
PHYSICA B-CONDENSED MATTER
(2023)
Article
Chemistry, Physical
Song Zhao, Mohamad Reda A. Refaai, Sadeq Salman, Majid Niaz Akhtar, Kang Du
Summary: The study proposes a method of optimizing the structure and absorber thickness, and increases the absorption performance of the NiCo2S4/AgBr nanocomposite by modifying the filler loading in the composite matrix. The results show that the thinnest layer with a thickness of 1.4 mm has a minimum reflection loss of -24 dB at 9.7 GHz, and the absorption bandwidth is 3.8 GHz. The measurement of electromagnetic radiation patterns demonstrates strong high-frequency absorption responses at 10.9 GHz and 11.4 GHz for samples with 25 wt.% and 35 wt.% filler loading. The key factors in improving the reflection loss and absorption efficiency are excellent conductive response, better matching properties, and electromagnetic losses.
SURFACES AND INTERFACES
(2023)
Article
Materials Science, Multidisciplinary
Kanwal Majeed, Muhammad Azhar Khan, Raqiqa Tur Rasool, Shagufta Gulbadan, Abeer A. AlObaid, M. Irfan, Ghulam Abbas Ashraf, Ghazanfar Nazir, Majid Niaz Akhtar
Summary: Recently, nano-sized Z-type hexagonal ferrites with Indium substitution have been synthesized and shown to have excellent properties for microwave absorption and resolving EM pollution. These materials also have significant applications in EM interference shielding and radar cross-section reduction, making them suitable for stealth technology.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Chemistry, Physical
Majid Niaz Akhtar, Zainab Mufarreh Elqahtani, Sabih Qamar, Abdullah Almohammedi, M. Irfan, Muhammad Azhar Khan, Muhammad Yousaf, Atif Nazir, Yuzheng Lu, Mustafa Z. Mahmoud, Muhammad Aslam, Z. A. Alrowaili, M. S. Al-Buriahi
Summary: The absorption characteristics of Co, Cu, and Zn-doped Ni-Ce nano ferrites were investigated and it was found that the Zn-doped NiCe absorber showed excellent performance for Ku band absorption applications, making it suitable for next-generation multifunctional absorbers.
SURFACES AND INTERFACES
(2023)
Article
Chemistry, Physical
Xiaoli Wang, Ali Hassan, Mohamad Reda A. Refaai, Mahyuddin K. M. Nasution, Majid Niaz Akhtar
Summary: In the modern world, electromagnetic interference is a serious issue. To effectively prepare materials with excellent electromagnetic wave dissipation capabilities, researchers synthesized pompon-flower-like CoGd0.5Fe1.5O4 and sphere-like BiFeO3. The findings demonstrate that using BiFe as the first layer and CoGd as the second layer in a bi-layer absorber can improve impedance matching and achieve high absorption with a broad effective absorption bandwidth.
SURFACES AND INTERFACES
(2023)
Article
Chemistry, Physical
Majid Niaz Akhtar, Nissren Tamam, Sunder Makhdoom, M. A. Baqir, Mustafa Z. Mahmoud, Muhammad Yousaf, Muhammad Azhar Khan, M. Irfan, Z. A. Alrowaili, M. S. Al-Buriahi
Summary: In this study, Dy-Gd doped YIG nano ferrites with excellent absorbing power and low cost were prepared by a sol-gel self-ignition route. The effects of Dy-Gd on the structural and electromagnetic characteristics of YIG were evaluated using various characterization techniques. The results showed that Dy-Gd doped YIG ferrites exhibit promising performance for microwave absorption and electromagnetic shielding applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
