MAHMOUD SALEH MOHAMMED ALKATHY

EDUCATION

Ph.D. in Physics

RESEARCH INTERESTS

Material Characterization, Materials Processing, Impedance Spectroscopy, Materials Scanning Electron Microscopy, XRD Analysis, X-ray Diffraction Single Crystal, Thin Films, and Nanotechnology, Microwave, Material Characteristics, Impedance Magnetoelectrics,Multiferroics, magnetodielectrics,

Scopus Publications

Synthesis and high-frequency magnetoelectric characterization of the 0-3 particulate lead-free multiferroic composite KNN/CFO
Alexandre José Gualdi, Leonardo Dos Santos Batacline, Gustavo Correia Espírito Santo, Mahmoud S Alkathy, and Fabio Luis Zabotto
IOP Publishing
Abstract The research for lead-free magnetoelectric (ME) multiferroic composite materials has increased considerably because they are environmentally friendly. For composites with 0–3 connectivity, synthesis with lead-free phase has proven challenging to obtain high values of ME coupling. This work reports the successful synthesis of the KNN/CFO composite (K0.5N0.5NbO3/CoFe2O4) by conventional synthesis process. XRD and SEI showed two well-defined, also presenting good electric polarization values. The ME coefficient was very high, reaching values close to 2850 mV cm−1·Oe at the electromechanical resonance frequency. The dipolar interaction between the electric charges and magnetic moments of the KNN and CFO phases was responsible for the high value and the behavior of dependence on the applied magnetic field.


Achieving multiferroic properties in bismuth titanate ceramics via a tri-doping engineering mechanism with Co, Sm, and La at room temperature
Mahmoud S. Alkathy, Yalambaku Rajesh, Flavio Paulo Milton, Fabio L. Zabotto, Valmor R. Mastelaro, Daniel Matos Silva, Ivair A. Santos, and J. A. Eiras
Springer Science and Business Media LLC



Enhancing dielectric properties and thermal stability in microwave-synthesized Nd-modified barium titanate nanoceramics for possible MLCC applications
Mahmoud S. Alkathy, Flavio Paulo Milton, Mansour K. Gatasheh, Fabio Luiz Zabotto, H. A. Kassim, K. C. James Raju, and Jose A. Eiras
Springer Science and Business Media LLC



Enhancing energy storage performance in BaTiO<inf>3</inf> ceramics via Mg and La co-doping strategy
Mahmoud S. Alkathy, Mansour K. Gatasheh, Fabio L. Zabotto, H. A. Kassim, K. C. James Raju, and Jose A. Eiras
Springer Science and Business Media LLC



Tunable energy bandgap of Fe-doped (Bi, Li) co-substituted barium titanate
Othman Ali, Mahmoud S Alkathy, E K Suresh, Avijit Ghosh, and K C James Raju
IOP Publishing
Abstract In this work, a polycrystalline Ba0.96(½ Bi, ½ Li)0.04Ti(1-x) FexO3; (0 ≤ x ≤ 0.08) ceramics have been synthesised using a solid-state reaction method. The prepared systems were explored to detect the impact of Fe substitution on the energy bandgap of the ceramics. XRD patterns confirmed that there is a structural phase transition from tetragonal (P4 mm) to hexagonal (P63/mmc) phase as the concentration of Fe increases. Rietveld refinement was performed to obtain the lattice information. Furthermore, Raman spectroscopic analysis confirmed the structural information obtained from XRD study. The average bond length variations, strain evolutions, crystallite size, and theoretical density have been calculated from the structural analysis. It is found that the lower Fe concentration with the tetragonal phase showed a strong Jahn-Teller effect. Meanwhile, the higher concentration of Fe led to phase transition to hexagonal phase with fewer structural distortions. The optical band gap species were investigated through UV-Vis. Following the onset of defects induced by acceptor ions, an exciting band gap reduction up to 2.09 eV for the sample with x = 0.08 was attained. ESR and PL spectroscopies analyses showed that in the hexagonal phase region more defects are formed giving rise to promoting band gap narrowing. Furthermore, the ac conductivity analysis indicates the appearance of defect levels due to the formation of oxygen vacancies. This study demonstrates that the right choice of Fe content in the host material can tune the energy band gap significantly in the BLBTF system and may be exploited in photovoltaics in the visible region.


Manganese and Magnesium Co-doped Barium Titanate: A Route Towards Enhanced Energy Storage Performance via Defect Dipoles Engineering
Mahmoud S. Alkathy, Srinivas Pattipaka, Mansour K. Gatasheh, Fabio L Zabotto, and Jose A. Eiras
Springer Science and Business Media LLC



Improve energy storage performance by tweaking grain size and widening the energy bandgap in modified BaTiO<inf>3</inf> ceramics
Mahmoud. S. Alkathy, Flavio Paulo Milton, Fabio L. Zabotto, Mansour K. Gatasheh, H. A. Kassim, K. C. James Raju, and Jose A. Eiras
Springer Science and Business Media LLC



Band gap tuning in samarium-modified bismuth titanate ferroelectric via iron doping for photovoltaic applications
Mahmoud S. Alkathy, Fabio L. Zabotto, Valmor R. Mastelaro, Flavio Paulo Milton, Daniel Matos Silva, Ivair A. Santos, and J. A. Eiras
Informa UK Limited



Structural description of temperature evolution of polar clusters in PLZT relaxor ceramics
Eriton Rodrigo Botero, Ducinei Garcia, Flavio Paulo Milton, Mahmoud Alkathy, and Fabio Luis Zabotto
Informa UK Limited



Structural quantification of polar/nonpolar phases of relaxor clusters in transparent ferroelectric ceramics
Eriton Rodrigo Botero, D. Garcia, F.P. Milton, F.A. Londono, M.S.M. Alkathy, and F.L. Zabotto
Elsevier BV



A phenomenological model for the magnetodielectric effect in magnetoelectric composites
R.A.R. Carvalho, R.P. Bonini, V.M.F. Barbosa, E.R. Botero, Mahmoud S. Alkathy, J.A. Eiras, and F.L. Zabotto
Elsevier BV



Achieving dense microstructure with desired physical properties rapidly and inexpensively in Bi-modified SrTiO<inf>3</inf> ceramics via microwave sintering technique
Mahmoud. S. Alkathy, Syed Mansoor Ali, J. Pundareekam Goud, Valmor R. Mastelaro, Fabio. L. Zabotto, Flavio Paulo Milton, Alexandre Strabello, K. C. James Raju, and J. A. Eiras
Springer Science and Business Media LLC



Effect of sintering temperature on structural, electrical, and ferroelectric properties of neodymium and sodium co-doped barium titanate ceramics
Mahmoud S. Alkathy, Fabio. L. Zabotto, Flavio Paulo Milton, Eriton Rodrigo Botero, Mansour K. Gatasheh, J. Pundareekam Goud, and J. A. Eiras
Springer Science and Business Media LLC



Enhanced ferroelectric, piezoelectric, and dielectric properties in potassium sodium niobate lead-free piezoelectric ceramics by constructing of multiple phase boundaries
Attaur Rahman, Mahmoud S. Alkathy, Muhammad Habib, Jamil Ur Rahman, Fabio L. Zabotto, Flavio Paulo Milton, Alexandre Strabello, Soonil Lee, and J.A. Eiras
Elsevier BV



Achieving high energy storage density simultaneously with large efficiency and excellent thermal stability by defect dipole, and microstructural engineering in modified-BaTiO<inf>3</inf> ceramics
Mahmoud.S. Alkathy, Attaur Rahaman, Valmor R. Mastelaro, Fabio.L. Zabotto, Flavio Paulo Milton, and J.A. Eiras
Elsevier BV



Room-temperature multiferroic behavior in the three-layer Aurivillius compound Bi<inf>3.25</inf>La<inf>0.75</inf>Ti<inf>2</inf>Nb<inf>0.5</inf>(Fe<inf>1-x</inf> Co<inf>x</inf>)<inf>0.5</inf>O<inf>12</inf>
C. Lavado, Mahmoud. S. Alkathy, J. A. Eiras, and M. G. Stachiotti
Springer Science and Business Media LLC



Enhanced energy-storage density of BaTi<inf>0.95</inf>Zr<inf>0.05</inf>O<inf>3</inf> via generation of defect dipoles upon lithium-doping
Mahmoud S. Alkathy, Attaur Rahaman, Valmor R. Mastelaro, Flavio Paulo Milton, Fabio L. Zabotto, Manuel H. Lente, Alexandre Strabello, and J.A. Eiras
Elsevier BV



Effect of gamma rays irradiation in the structure, optical, and electrical properties of samarium doped bismuth titanate ceramics
Mansour K. Gatasheh, Mahmoud S. Alkathy, Hamoud Abdoh Kassim, Jakkapally Pundareekam Goud, and Jose A. Eiras
Walter de Gruyter GmbH
Abstract Ceramics have enormous potential in several emerging technologies, including nuclear reactors. Materials with chemical inertness, high-temperature operation, and physical properties stability under applied radiation with high energy are all desired in this field of technology. Given these broad specifications, bismuth titanate ceramics may prove to be a valuable material. Regarding this task, the effect of gamma rays on the structural, optical, and ferroelectric properties of samarium-modified bismuth titanate ceramics was investigated. The Bi3.15Sm0.85Ti3O12 (BSmT) compound was irradiated for 0, 50, 100, and 200 kGy using a 60Co gamma source at a dose rate of 10 kGy h−1. The phase structure confirmed the orthorhombic, single-phase nature even after gamma irradiation. The results show that the unit cell volume decreases from 966.39 to 962.38 Å3 with an increase in gamma dose from 0 to 200 kGy. The X-ray photoelectron spectroscopy study shows an irradiation-induced defect in the host matrix. The results show that the bandgap energy, dielectric constant, Curie temperatures, and remnant polarization slightly decreased with an increase in gamma irradiation. According to the findings of this study, the BSmT exhibits adequate stability against gamma irradiation, which offers tremendous promise in their utilization in nuclear reactor technology.


Achieving high energy storage performance and efficiency in lead-free SrTiO<inf>3</inf> ceramics via neodymium and lithium co-doping technique
Mahmoud S. Alkathy, Srinivas Pattipaka, Mansour K. Gatasheh, H. A. Kassim, Mohamed Saad Daoud, and Jose A. Eiras
Informa UK Limited



Thickness dependence of microwave dielectric tunability in Ba<inf>0·5</inf>Sr<inf>0·5</inf>TiO<inf>3</inf> thin films deposited by pulsed laser deposition
J. Pundareekam Goud, Ajeet Kumar, Mahmoud S. Alkathy, Kongbrailatpam Sandeep, Akhil Raman TS, Bibhudatta Sahoo, Jungho Ryu, and K.C. James Raju
Elsevier BV



Room-temperature multiferroic behaviour in Co/Fe co-substituted layer-structured Aurivillius phase ceramics
Mahmoud S. Alkathy, Attaur Rahman, Fabio L. Zabotto, Flavio Paulo Milton, K.C. James Raju, and J.A. Eiras
Elsevier BV



Bandgap tuning in samarium-modified bismuth titanate by site engineering using iron and cobalt co-doping for photovoltaic application
Mahmoud.S. Alkathy, Fabio.L. Zabotto, Flavio Paulo Milton, and J.A. Eiras
Elsevier BV



Achieving high energy storage performance and breakdown strength in modified strontium titanate ceramics
Mahmoud S. Alkathy, Fabio L. Zabotto, Flavio Paulo Milton, and J. A. Eiras
Springer Science and Business Media LLC



Effect of nickel and zinc co-substitution on the structural and dielectric properties of barium titanate ceramics
Vishnu R. Nair, T. S. Akhil Raman, Mahmoud S. Alkathy, and K. C. James Raju
Springer Science and Business Media LLC



Effect of defects on the band gap and photoluminescence emission of Bi and Li co-substituted barium strontium titanate ceramics
Mahmoud S. Alkathy, Fabio L. Zabotto, K.C. James Raju, and J.A. Eiras
Elsevier BV

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