Article
Chemistry, Inorganic & Nuclear
Edapalli Sumalatha, N. Hari Kumar, Avula Edukondalu, D. Ravinder
Summary: In this study, lanthanum ion doped zinc cobalt ferrite nanoparticles were successfully synthesized using the citrate gel auto-combustion method, and the structural characterization was analyzed from various aspects. The results show that the doping of lanthanum ion can modify the lattice parameter, surface area, and surface roughness of the nanoparticles, and have an impact on the magnetic and electrical properties.
INORGANIC CHEMISTRY COMMUNICATIONS
(2022)
Article
Materials Science, Ceramics
Ruqayya Zakir, Sadia Sagar Iqbal, Atta Ur Rehman, Sumaira Nosheen, Tasawer Shahzad Ahmad, Nimra Ehsan, Fawad Inam
Summary: The spinel nano-ferrites with varying Ce3+ doping were synthesized using the sol-gel auto combustion method. The XRD analysis confirmed the formation of spinel matrix and reduction in lattice constant, while the FTIR and UV-visible studies revealed changes in absorption bands and optical band gaps. The electrical resistivity, dielectric constant, and dielectric constant loss were also found to be influenced by Ce3+ doping, showing dispersive behavior at higher frequencies.
CERAMICS INTERNATIONAL
(2021)
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
A. Mahesha, M. Nagaraja, A. Madhu, N. Suriyamurthy, S. Satyanarayana Reddy, M. Al-Dossari, N. S. Abd EL-Gawaad, S. O. Manjunatha, K. Gurushantha, N. Srinatha
Summary: In this study, the effect of Cr3+ content on the distinctive features of Cr3+ doped ZnO nanoparticles synthesized through auto-combustion using leucine as the fuel was investigated. The analysis of the synthesized powders using XRD, UV-Visible, and Photoluminescence spectroscopy showed that the presence of fuel and Cr3+ content influenced the structural, optical, and luminescence characteristics of the nanoparticles. The results revealed that the addition of Cr3+ reduced the crystallite size while increasing lattice parameters, unit cell volume, strain, and dislocation density. Furthermore, the emission and photocatalytic activity of the Cr3+ doped ZnO nanoparticles were also examined, demonstrating their potential for future optoelectronic and photocatalytic applications.
CERAMICS INTERNATIONAL
(2023)
Article
Crystallography
Danyal Ahmad, Asad Ali, Zahid Abbas, Abid Zaman, Amnah Mohammed Alsuhaibani, Vineet Tirth, Mahidur R. R. Sarker, Nor Azwan Mohamed Kamari, Ali Algahtani, Mohammed Aljohani
Summary: Ni0.5Cd0.5HoxFe2-xO4 (X = 0, 0.02, and 0.04) ferrites with holmium substitution were synthesized through a sol-gel auto-combustion process. Characterizations using XRD, SEM, FTIR spectroscopy, and impedance spectroscopy revealed the structural and physical properties of the nanoparticles. The results showed that the addition of holmium reduced the lattice constant and increased the average crystallite size. The dielectric properties also exhibited an increase in tangent loss and dielectric constant with increasing holmium concentration.
Article
Chemistry, Physical
Thekrayat H. AlAbdulaal, Vanga Ganesh, Manal AlShadidi, Mai S. A. Hussien, Abdelfatteh Bouzidi, Hamed Algarni, Heba Y. Zahran, Mohamed Sh. Abdel-wahab, Ibrahim S. Yahia, Samia Nasr
Summary: An efficient combustion technique was used to produce ZnO nanopowders with different concentrations of Eu dopants. The structural morphology and optical behaviors of Eu2O3-ZnO nanocomposites were investigated. Results showed that the photocatalytic degradation efficiency of phenol and methylene blue increased with higher Eu doping ratios. The obtained Eu2O3-doped ZnO nanostructured materials are considered innovative, promising candidates for various nano-applications.
Article
Materials Science, Ceramics
Zenghui Liu, Jun Xu, Junni Zhai, Zhixuan Guo, Hongyan Wan, Tao Xue, Jingrui Li, Gang Niu, Peng Shi, Lingyan Wang, Wei Ren, Bian Tian, Hongzhong Liu, Zhuangde Jiang, Zuo-Guang Ye
Summary: Preparation condition plays a critical role in the structure and properties of ceramics. In this study, the effects of sintering temperature on the crystal structure, microstructure, and electrical conductivity of LaCrO3-based conducting oxides were investigated. It was found that the calcining temperature can be reduced by using nano-powders as raw materials. The sintering temperature-induced structural transition and the enhancement of electrical conductivity by introducing Sr and Ca ions were also observed.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Chemistry, Inorganic & Nuclear
Divya Vijayan, Jijimon K. Thomas, Sam Solomon
Summary: We report the synthesis, structural, optical, and electrical characteristics, along with the structural evolution at different temperatures of rarely studied compound Ln(2)Zr(2)O(7). The compound exhibits high absorbance in the UV region, high reflectance in the visible region, and wide optical bandgap energy. Impedance spectroscopic study reveals pure oxide-ion conductivity of the compound in a temperature range of 550°C to 850°C.
SOLID STATE SCIENCES
(2022)
Article
Chemistry, Multidisciplinary
Nakiraboina Venkatesh, D. Ravi Kumar, Shyamsunder Goud, Syed Ismail Ahmad, P. Veerasomaiah, D. Ravinder
Summary: In this study, Gadolinium-substituted magnesium nanoferrites were synthesized using the citrate gel auto-combustion method. The effect of Gd3+ substitution on the structural, photocatalytic, electrical and magnetic properties of magnesium nanoferrites was investigated.
Article
Physics, Condensed Matter
N. Sivakumar, J. Gajendiran, Ali Alsalme, Kentaro Tashiro
Summary: This study compares the surface structural behavior, electrochemical sensing, and magnetic properties of undoped and Sr-doped lanthanum ferrite (LaFeO3) products. The results show that the Sr-doped LaFeO3 nanoparticles have smaller size, dispersed particles, higher band gap, coercivity, and specific capacitance compared to undoped LaFeO3 nanoparticles.
PHYSICA B-CONDENSED MATTER
(2022)
Article
Physics, Multidisciplinary
Ravindra N. Chikhale, S. A. Kanade, Pushpinder G. Bhatia
Summary: In this study, nanoparticles of Co0.75Ni0.25Fe2-zDyzO4 were prepared using the sol-gel auto-combustion method. The cation distribution and structure of the samples were confirmed, and the size and magnetic properties were investigated. The results showed that lattice strain affects the crystallite size and the nanoferrite exhibited ideal magnetic properties.
Article
Engineering, Electrical & Electronic
N. G. Imam, G. Aquilanti, A. A. Azab, Shehab E. Ali
Summary: The study characterized the La1-xBixFeO3 multiferroic perovskite using X-ray diffraction and synchrotron radiation X-ray absorption spectroscopy, showing that Bi doping influences the structural modification and magnetic properties of the material. The research supports a smooth structural transition towards structural asymmetry reduction in the doped perovskite.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(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
Engineering, Electrical & Electronic
Md. Harun-Or-Rashid, Md. Mahfuzur Rahman, M. Arifuzzaman, A. K. M. Akther Hossain
Summary: A series of polycrystalline ferrite compositions with different doping ratios were successfully prepared using the sol-gel auto-combustion technique. The materials exhibited single-phase cubic spinel structures with varying lattice constants and bulk densities. Among them, Ni0.38Cu0.16Zn0.46Fe2O4 showed the largest grain size and superior physical properties when sintered at 1050 degrees C.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Materials Science, Ceramics
J. Hakami, Umit H. Kaynar, M. Ayvacikli, M. B. Coban, J. Garcia-Guinea, P. D. Townsend, M. Oglakci, N. Can
Summary: A series of Tb3+-doped Y1-xAl3(BO3)4 phosphors were synthesized and characterized in this study. The synthesized phosphors exhibited good crystallinity and crystal structure, and showed a green main emission peak at 543 nm under excitation. The photoluminescence intensity of the phosphors increased with increasing Tb3+ ion concentration up to a certain threshold, and then exhibited concentration quenching. Moreover, the study found the activation energies for thermal quenching at different wavelengths.
CERAMICS INTERNATIONAL
(2022)
Article
Engineering, Electrical & Electronic
N. G. Imam, G. Aquilanti, A. A. Azab, Shehab E. Ali
Summary: The study characterized the La1-xBixFeO3 multiferroic perovskite using X-ray diffraction and synchrotron radiation X-ray absorption spectroscopy, showing that Bi doping influences the structural modification and magnetic properties of the material. The research supports a smooth structural transition towards structural asymmetry reduction in the doped perovskite.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Physics, Condensed Matter
T. A. Abdel-Baset, E. A. Hekal, A. A. Azab, Badawi Anis
Summary: The dielectric properties of PVF foam doped with various weight percentages of MWCNTs were studied, showing that higher MWCNTs content resulted in higher dielectric constant and lower loss tangent values in the foam. The dominant conduction mechanism in the PVF/MWCNTs foams was found to be correlated barrier hopping (CBH).
PHYSICA B-CONDENSED MATTER
(2021)
Article
Materials Science, Ceramics
Moustafa M. S. Sanad, A. A. Azab, T. A. Taha
Summary: Enhancing the electrical conductivity of electrode materials through a cationic substitution strategy improves the electrochemical performance of Li-ion batteries. In this study, LixCa1-xFe2O4 nanoparticles with an orthorhombic structure were synthesized at low temperature. Li-doping was found to increase the conductivity and ion mobility of CaFe2O4, resulting in significant improvement in initial discharge capacities.
CERAMICS INTERNATIONAL
(2022)
Article
Engineering, Electrical & Electronic
T. A. Taha, Emad M. Ahmed, Asmaa I. El-Tantawy, A. A. Azab
Summary: In this study, single-phase Fe/ZnO nanostructures were synthesized using a direct sol-gel method to investigate the compatibility of zinc oxide for spintronic applications. The samples were characterized using various techniques including X-ray diffraction, transmission electron microscopy, X-ray photoelectron spectroscopy, UV-Vis spectroscopy, and vibrating sample magnetometer. The results showed that Fe-doped ZnO exhibited weak ferromagnetism at room temperature, with an expansion in lattice unit volume and a decrease in energy gap. Dielectric measurements also indicated a decrease in dielectric constant and AC conductivity with increasing Fe content.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
A. M. Mansour, R. S. Ibrahim, A. A. Azab
Summary: The possibility to integrate different nanomaterials offers the opportunity to obtain new nanocomposites with unique features. This study prepared CdS and Fe3O4 nanocomposites with varying concentrations of Fe3O4 and investigated their structure, morphology, optical, and magnetic properties. The results showed that the addition of Fe3O4 affected the optical and dielectric properties, while the nanocomposites exhibited ferromagnetic behavior.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Article
Pediatrics
Mohamed Omran, Hazem Elgalaly, Ahmed Sakr, Ahmed A. Azab, Mahmoud A. Said, Mohamed Abdalla
Summary: This study aimed to identify the risk factors for the need of penile resurfacing techniques in re-operative hypospadias. The results showed that the number of previous repairs and one-stage repair were independent risk factors for penile resurfacing.
JOURNAL OF PEDIATRIC UROLOGY
(2022)
Article
Materials Science, Ceramics
Talaat A. Hameed, A. A. Azab, R. S. Ibrahim, K. E. Rady
Summary: Magneto-optical TiO2/xCoFe(2)O(4) nanocomposites with various concentrations of CoFe2O4 were prepared using mechanical mixing. These nanocomposites exhibited ferromagnetic characteristics and their magnetic parameters were influenced by the percentage of CoFe2O4 in the composites.
CERAMICS INTERNATIONAL
(2022)
Article
Physics, Multidisciplinary
A. M. Reda, A. A. Azab, G. M. Turky
Summary: In this study, HDPE nanocomposites with different ratios of iron oxide and aluminum metal nanoparticles were prepared for gamma-ray shielding applications. The electrical and magnetic properties of the nanocomposites were investigated, and their ability to attenuate gamma-rays was evaluated. The results showed that the nanocomposites exhibited improved electrical and magnetic properties, as well as enhanced gamma-ray shielding ability compared to pure HDPE.
Article
Physics, Multidisciplinary
S. Solyman, Emad M. Ahmed, A. A. Azab
Summary: In this study, nanocomposites were prepared with different weight ratios of ZnO and Fe3O4. The structure, morphology, optical, and magnetic properties were analyzed using various techniques. The results showed that Fe3O4 influenced the optical properties of ZnO and the nanocomposites exhibited ferromagnetic behavior, with improved magnetic properties as the Fe3O4 content increased.
Article
Instruments & Instrumentation
N. G. Imam, Messaoud Harfouche, A. A. Azab, S. Solyman
Summary: This study investigates the structural changes of Mn-doped ZnO nanoparticles induced by gamma-irradiation using gamma-Irradiation and XAFS spectroscopy. The results demonstrate the impact of Mn doping and gamma-irradiation on the crystal and electronic/local structures of the samples. XRD, XANES, and EXAFS techniques provide useful information on the structural and magnetic properties.
JOURNAL OF SYNCHROTRON RADIATION
(2022)
Article
Physics, Multidisciplinary
Manal A. Mahdy, A. A. Azab, I. K. El Zawawi, G. Turky
Summary: This study investigates the structural, morphological, optical, magnetic, and dielectric properties of (ZnO)(1-x)(CoFe2O4)(x) nanocomposites synthesized by sonomechanical method. The addition of CoFe2O4 significantly affects the optical, magnetic, and dielectric properties of the nanocomposites.
Article
Engineering, Electrical & Electronic
T. A. Taha, Majed Alshammari, Alhulw H. Alshammari, Ashraf. K. Eessaa, A. A. Azab
Summary: Nanostructured metal oxide semiconductors, such as Fe-doped ZnO nanopowders synthesized by the sol-gel method, exhibit attractive electrical properties and find wide applications in electronic devices. The structure of nanoparticles was characterized using scanning electron microscopy (SEM) and Fourier transform infrared (FTIR) analysis, revealing their spherical shape and bonding characteristics. The dielectric constant and AC/DC conductivity of the Fe-doped ZnO nanoparticles were found to increase with increasing temperature and Fe concentration, while the loss tangent decreased with temperature. The results suggest that the Fe doping improves the relaxation behavior and increases the number of charge carriers, contributing to enhanced electrical properties.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
S. A. Gad, Ali B. Abou Hammad, Amany M. ElNahrawy, H. Shaban, A. A. Azab, A. M. Moustafa
Summary: Er3+-incorporated Mo0.6-xTi0.3Zn0.1 nanorods thin films were prepared using controlled sol-gel method. The effect of Er doping concentration on the films structure, optical, photoluminescence, and magnetic properties was investigated. The films exhibited a bi-phasic structure with MoO3 and Ti6O11 phases. The presence of Er3+ improved the reflectance and induced photoluminescence with emission lines at 1477 and 1543 nm.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Physics, Multidisciplinary
J. Al Boukhari, Z. Bitar, A. A. Azab, R. Awad
Summary: Ni1-2xMgxRuxO (x = 0, 0.005, 0.01, 0.02, 0.04 and 0.08) nanoparticles were synthesized through coprecipitation method. The codoped NiO nanoparticles exhibited good thermal stability and the formation of NiO cubic structure with RuO2 secondary phase at high codoping concentrations. The optical, magnetic and structural properties of the nanoparticles were characterized using various techniques.
Article
Physics, Multidisciplinary
Hisham A. Saleh, A. A. Azab, T. M. Dahy
Summary: Novel quaternary CuNiSbS chalcogenide material was prepared using a simple co-precipitation method, and its structure, morphology, infrared absorption, and energy band gap were characterized. The AC conductivity, dielectric properties, and magnetic behavior of the prepared material were also investigated.