Article
Physics, Condensed Matter
N. P. Samantray, R. N. P. Choudhary
Summary: Bismuth ferrite (BiFeO3) is a commonly used multiferroics for multifunctional applications. In this study, co-doped (Sr/Zr) bismuth ferrite samples of different chemical compositions were prepared and their structural, morphological, and electrical properties were investigated. The results show that the samples have uniform grain distribution and exhibit ferroelectricity and Ohmic behavior.
PHYSICA B-CONDENSED MATTER
(2022)
Article
Materials Science, Multidisciplinary
V. A. Khomchenko, M. Das, M. S. C. Henriques, J. A. Paixao
Summary: Investigations were conducted on the crystal structure and magnetic properties of the Bi0.85Sr0.15Fe1-xMnxO3 (0.1 ≤ x ≤ 0.5) ferromanganites. The materials maintain a single-phase polar R3c structure up to x = 0.35, with the antipolar Pnam phase stabilizing at higher Mn content. This results in the coexistence of spontaneous polarization and magnetic order, influencing the cycloidal antiferromagnetic arrangement and leading to the formation of a canted antiferromagnetic phase at room temperature. Complex magnetic behavior, including irregular changes in remanent magnetization and coercive field, suggests temperature-driven modification near the polar/antipolar phase boundary.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
N. P. Samantray, R. N. P. Choudhary
Summary: This study reported the structural and electrical properties of Ca/Zr modified polycrystalline BiFeO3 samples prepared by solid-state reaction method, revealing the formation of single phase perovskite in rhombohedral phase and the ferroelectricity in the materials. Analysis of X-ray diffraction data and scanning electron microscope images provided insights into the micro-structure, while dielectric, impedance and conductivity studies offered information on the dielectric properties and conductivity of the materials. Additionally, the contribution of grains and grain boundaries towards the total resistance and capacitance was determined from Nyquist plots. The J-E characteristics demonstrated Ohmic behavior with a slope close to 1.
MATERIALS CHEMISTRY AND PHYSICS
(2021)
Article
Chemistry, Physical
Bappa Sona Kar, M. N. Goswami, P. C. Jana
Summary: La2O3-substituted polycrystalline 0.56BiFeO(3)-0.44BaTiO(3) ceramics were prepared via conventional solid-state reaction process, with investigations on crystal structure, dielectric, magnetic, and impedance properties. La substitution enhanced the multiferroic nature of the materials, as evidenced by improved energy storage density and remnant magnetization.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Crystallography
Shalendra Kumar, Kavita Kumari, Mohammad Rizwan Khan, Maqsood Ahmad Malik, Rajesh Kumar, Saurabh Dalela, Bon Heun Koo
Summary: Bi1.05Fe1-xMnxO3 nanoparticles were successfully synthesized, and their structural, ferroelectric, optical, and magnetic properties were investigated. The magnetic properties showed different trends with an increase in Mn concentration, suggesting potential applications.
Article
Materials Science, Ceramics
J. N. B. Sales, R. T. da Silva, L. R. S. Lara, S. L. L. M. Ramos, J. S. Soares, T. A. S. Soares, G. Machado, S. M. Manhabosco, A. B. de Oliveira, H. B. de Carvalho, R. J. C. Batista, H. O. Stumpf, T. M. Manhabosco
Summary: Co-, Ni-, and Mn-doped BiFeO3 (BFO) ceramics were synthesized through a solid-state reaction, showing visible-light response. Co- and Ni-doped BFO samples exhibited enhanced ferromagnetic order at room temperature with secondary phases present in minor quantities. Optical spectra revealed two absorption bands and M - H hysteresis loops suggested enhanced ferromagnetism in the Co- and Ni-doped BFO samples.
CERAMICS INTERNATIONAL
(2021)
Article
Engineering, Electrical & Electronic
Preeti Yadav, Arushi Pandey, Bushra Khan, Pushpendra Kumar, Ashok Kumar, Manoj K. Singh
Summary: This study reports the synthesis and characterization of sol-gel derived calcium-doped Bi1-xCaxFeO3 nanocrystalline multiferroic ceramics with low leakage and large magneto-dielectric properties. XRD analysis reveals the crystal structures of pure BiFeO3 and calcium-doped BiFeO3, and a complex structure for calcium-doped BiFeO3. The experimental results demonstrate excellent magneto-dielectric coupling performance and positive magneto-dielectric effects of calcium-doped BiFeO3 at room temperature.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Chemistry, Physical
Grecia Alejandra Gomez-Iriarte, Arbelio Penton-Madrigal, Luiz Augusto Sousa de Oliveira, Joao Paulo Sinnecker
Summary: This paper reports an XPS surface study of pure phase BiFeO3 thin film produced and later etched by pure argon ions. Fe3+ and Bi3+ components are mainly present, along with Fe2+. High-energy argon etching induces the growth of Fe-(0()) and Bi-(0) and an increment of Fe2+. The semiconductor character of BiFeO3 is preserved despite the oxygen loss.
Article
Engineering, Electrical & Electronic
Lisham Paris Chanu, Sumitra Phanjoubam
Summary: Rare earth manganite YMnO3 and YMn0.9Cr0.06Fe0.04O3 with co-substituted transition metal ions at Mn-sites were synthesized via sol-gel auto combustion route. The effect of Cr3+ and Fe3+ co-substitution on the structural and electrical properties of YMnO3 was investigated. Structural and morphological analysis confirmed the improvement in dielectric properties of the substituted sample.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Article
Materials Science, Ceramics
N. D. Long, P. T. Tho, N. D. Co, L. T. Ha, N. T. M. Hong, C. T. A. Xuan, C. V. Ha, V. N. Shut, V. I. Mitsiuk, M. V. Bushinsky, M. V. Silibin, D. V. Karpinsky
Summary: Bi1-xEuxFeO3 ceramic samples with x = 0.1-0.2 were synthesized to investigate the correlation between multiphase coexistence and magnetic response. X-ray diffraction and Raman scattering spectra revealed structural transitions and a mixed phase state in the composition range of 0.10 <= x <= 0.18. Magnetic measurements showed weak ferromagnetic behavior, with maximum magnetization in phase mixture compounds and a decrease in single phase compounds. The different magnetic responses were explained in terms of phase boundary spins and intrinsic antiferromagnetic spins.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Ceramics
Manoj Kumar, Sunil Chauhan, Himanshu Pandey
Summary: This work focuses on the synthesis and characterization of Gd3+-substituted BiFeO3 nanoparticles. The results show that the substitution of Gd3+ ions leads to structural changes in the nanoparticles, as confirmed by X-ray diffraction and Raman spectroscopy. Core-level X-ray photoelectron spectroscopy further reveals the dominance of Fe3+ oxidation state and the presence of oxygen vacancies. Moreover, the magnetic properties of the nanoparticles are enhanced with an increase in Gd3+ concentration, with a maximum ferromagnetic contribution observed at x = 0.12.
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
(2023)
Article
Materials Science, Ceramics
Subhash Sharma, Manish Kumar, Gunjan Srinet, J. M. Siqueiros, Oscar Raymond Herrera
Summary: In this study, multiferroic ceramics Bi0.80La0.10Ca0.10Fe1-xMnxO3 were synthesized and two crystalline phases were found throughout the composition range. The addition of Mn enhanced the magnetic properties, leading to potential technological applications.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
N. P. Samantray, B. B. Arya, R. N. P. Choudhary
Summary: The preliminary investigation of the structural and frequency-temperature dependence of dielectric and electrical characteristics of Ba/Zr modified Bismuth ferrite (BiFeO3) was reported. The synthesized compounds were found to have a perovskite rhombohedral structure according to X-ray diffraction analysis. The study of dielectric and electrical characteristics across a wide temperature range and different frequencies provided important results on conduction mechanism, relaxation process, and ferroelectricity of the samples.
JOURNAL OF ELECTROCERAMICS
(2023)
Article
Materials Science, Multidisciplinary
Fei Xue, Yahui Tian, Fangfang Guo, Lan Qiu, Weijun Wang, Weikang Tang
Summary: In this study, the 0.8BiFeO3-0.2GdFeO3 (BFO-GFO) ceramics were synthesized by solid-state reaction method. The results showed that the ceramics exhibited significant ferroelectricity, high density, and excellent relaxor ferroelectric behavior. The conductivity of the ceramics was found to be influenced by the ionization of oxygen vacancies.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Jaswinder Pal, Sunil Kumar, Kanika Aggarwal, Sanjeev Kumar, Chi-Liang Chen, Wei-Hsiang Huang, Wei-Nien Su, Anupinder Singh
Summary: A comparative study of Ca, Sr and Ba doped BF-PT binary solid solutions synthesized via solid-state reaction route is reported. The highest remnant polarization and dielectric constant are observed in the BF-PCT system. The AC conductivity increases from the BF-PT system to the BF-BT system. NEXAFS study reveals the influence of hybridization between Pb 6s and O 2p states on the dielectric and ferroelectric properties in the lead-based solid solutions.
MATERIALS CHARACTERIZATION
(2022)
Article
Materials Science, Ceramics
Sidra Aslam, Shahid M. Ramay, Asif Mahmood, Ghulam M. Mustafa, Sidra Zawar, Shahid Atiq
Summary: The nanoarchitecture of transition metal oxides is considered crucial in supercapacitor electrode materials. In this study, Co3O4 doped with transition metals (Ni, Mn, and Zn) was synthesized using a simple co-precipitation technique. X-ray diffraction analysis showed a face-centered cubic lattice for Co3O4, with slight variations in lattice parameters when iso-valent metals were doped at the Co site. The incorporation of a nominal amount of Ni, Mn, and Zn resulted in a favorable porous morphology and increased porosity. Electrochemical measurements revealed that Mn0.05Co2.95O4 displayed the highest specific capacitance of 80.8 F/g, making it a potential candidate for electrochemical supercapacitor applications.
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
(2023)
Article
Nanoscience & Nanotechnology
Faheem Ahmed, Ahmad Umar, Shalendra Kumar, Nagih Mohammed Shaalan, Nishat Arshi, Mohd Gulfam Alam, P. M. Z. Hasan, Shahid M. Ramay, Rizwan Khan, Abdullah Aljaafari, Adil Alshoaibi
Summary: In this study, a highly stable capacitive deionization (CDI) electrode was fabricated using reduced graphene oxide (RGO) as the positive electrode and spherical-like manganese dioxide nanoparticles decorated RGO sheets (MnO2/RGO) as the negative electrode, which selectively captured salt ions from saline solution. The MnO2/RGO electrodes exhibited a large specific capacitance and lower internal resistance, making them suitable for desalination applications. The MnO2/RGO//RGO-based CDI device showed higher salt uptake capacity and average salt adsorption capacity compared to recent electrode materials, indicating its potential for producing portable drinking water from seawater.
ADVANCED COMPOSITES AND HYBRID MATERIALS
(2023)
Article
Biochemistry & Molecular Biology
Muhammad Abrar Yousaf, Sadia Anjum Anwer, Shefin Basheera, Sreekumar Sivanandan
Summary: This study screened 146 phytochemicals from Moringa oleifera and identified potential anti-EGFR compounds using drug-likeness and molecular docking analysis. The most effective inhibitors were Delta 7-Avenasterol, 24-Methylenecholesterol, Campesterol, and Ellagic acid. These compounds showed promising binding energies and acceptable ADMET profiles, making them potential candidates for further laboratory and clinical tests.
JOURNAL OF BIOMOLECULAR STRUCTURE & DYNAMICS
(2023)
Article
Chemistry, Multidisciplinary
Anwar ul Haq, Sadia Sagar Iqbal, Afaq Ahmad, Tasawer Shahzad Ahmad, Abu Bakar, Shahid M. Ramay
Summary: The opto-electronic properties and mechanical stability of A2TlBiI6 (A = Cs and Rb) were investigated using density functional theory. The results showed that these halide double perovskite materials exhibit strong structural and dynamical stability, with direct band gaps of 2.0 and 2.1 eV for Cs2TlBiI6 and Rb2TlBiI6, respectively. These materials show promising potential for use in multi-junction solar cells for renewable energy applications.
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
(2023)
Article
Materials Science, Multidisciplinary
Maria Khalil, Aneeqa Bashir, Eman A. Alghamdi, Abubaker A. Siddig, Shahid M. Ramay, Murtaza Saleem
Summary: Titanium oxide (TiO2) is an important semiconductor material with promising optoelectronic, thermoelectric, and photovoltaic applications. The effect of dopant on TiO2 properties was investigated using first-principles calculations and density functional theory. Thin films were fabricated using reactive magnetron sputtering, and analysis showed the formation of the rutile phase of Titania. The study revealed that oxynitrides thin films with epsilon near zero response are suitable for enhanced optoelectronic and thermoelectric applications.
MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Asif Mahmood, Shahid M. Ramay, Waheed Al-Masry
Summary: DFT calculations were used to examine the properties of Cr-based spinel compounds ACr(2)O(4) (A = Hg, Cd), including half-metallicity, thermoelectricity, and electronic properties. The structural and elastic properties were calculated using the PBEsol-GGA method with a modified Perdew-Burke-Ernzerhof plus generalized gradient approach (mBJ + GGA). The modified-Becke Johnson (mBJ) potential was employed to study the electronics and thermoelectric properties. Energy differences calculations were performed to validate the stability of the structures in the ferromagnetic (FM) and non-magnetic (NM) phases. Additionally, the elastic properties were examined in detail using the Chopin technique. The hybridization of the 2p-states of chalcogenide and the 3d-states of Cr atoms resulted in significant Fermi-level hybridization and provided the total magnetic moments. Furthermore, the examined spinels showed potential applications in thermoelectric devices based on their transport characteristics such as power factor, Seebeck coefficient, and thermal and electrical conductance.
ECS JOURNAL OF SOLID STATE SCIENCE AND TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Humna Asad, Hamad Ali, Ghulam Ali, M. Tamoor Ansar, Shahid M. Ramay, Eman A. Alghamdi, Shahid Atiq
Summary: This study investigates the impact of Nd-substitution on the morphological and electrochemical features of Nd-doped LaCoO3 nanoparticles. A simple and cost-effective sol-gel process is used for sample synthesis. The results reveal the transformation from a sponge-like structure to grains-like morphology and demonstrate the surface redox and intercalation pseudo-capacitive nature of the samples. La0.95Nd0.05CoO3 is identified as a potential candidate for electrode material in supercapacitors due to its high power and energy densities.
ECS JOURNAL OF SOLID STATE SCIENCE AND TECHNOLOGY
(2023)
Article
Crystallography
Shahid M. Ramay, Mohammed H. Aldosary, Ghulam M. Mustafa, Sadaf Saba, Shahid Atiq, Sikandar Aftab, M. A. Ebdah
Summary: Double perovskites are promising functional materials with high durability due to their flexible cation coordination selection. We synthesized pristine and Cu2+-doped Ba2NiWO6 and studied their structure, morphology, and dielectric behavior. Both compositions exhibited cubic crystal structure, but Cu2+ integration reduced the crystallite size and induced agglomeration of spherical-shaped grains. Cu2+ doping resulted in space charge accumulation at grain boundaries, promoting space charge polarization and increasing the dielectric constant. These findings make these compositions suitable for advanced miniaturized electronic devices.
Article
Materials Science, Multidisciplinary
Tahir Iqbal, Khizar Ul Haq, M. Irfan, Maria Khalil, Shahid M. Ramay, M. A. Ebdah, Murtaza Saleem
Summary: PVDF polymer composites with incorporated transition metal oxides show enhanced optical response. The presence of ZnO and NiO nanoparticles as fillers in PVDF thin films was confirmed by X-ray diffraction analysis and scanning electron microscopy. Spectroscopic ellipsometry was used to extract optical parameters such as refractive index, absorption coefficient, and optical conductivity. The results show that these nanocomposites have promising optical properties for photovoltaic applications.
MATERIALS RESEARCH EXPRESS
(2023)
Article
Biochemistry & Molecular Biology
Ammara Ramzan, Muhammad Abrar Yousaf, Muhammad Usman Rashid, Shefin Basheera, Naila Malkani
Summary: This study conducted an in-silico analysis of TGF-beta 1 non-synonymous variants and identified four variants that can affect the structure of TGF-beta 1 protein and result in functional consequences. Among them, the E35D variant significantly destabilized the protein structure and affected the interactions with Fresolimumab.
JOURNAL OF BIOMOLECULAR STRUCTURE & DYNAMICS
(2023)
Article
Physics, Multidisciplinary
Anwar ul Haq, Tasawer Shahzad Ahmad, Muhammad Amin, Abu Bakar, A. Afaq, Nimra Ehsan, Shahid M. Ramay, Abubaker Ahmed Siddig
Summary: In this study, the structural, elastic, and optoelectronic properties of cubic double halide perovskites A(2)AgAlI(6) (A = Na, K, Rb) were calculated and their potential application in solar panels was indicated.
Article
Chemistry, Physical
Affifa Qayyum, Muhammad Okash ur Rehman, Farooq Ahmad, Muhammad Ahmed Khan, Shahid M. Ramay, Shahid Atiq
Summary: Researchers have synthesized a series of perovskite materials with general formula La1-xNdxNiO3 (x=0,0.05,0.1,0.15) through a cost-effective sol-gel auto-combustion method, which can be used as electrode material in supercapacitors. The synthesized samples were confirmed through X-ray diffraction, and their crystal structure parameters were determined. Field emission scanning electron microscopy showed the presence of well-defined and uniformly distributed nano-spheres, nano-rods, and nano-size particles. The electrochemical analysis demonstrated that La0.85Nd0.15NiO3 exhibited the highest specific capacitance of 64.381 F/g at a scan rate of 0.01 Vs-1 through cyclic voltammetry. The galvanic charge/discharge tests showed power density and energy density values of 846.56 W/kg and 20.92 Wh/kg, respectively. This comprehensive study highlights the potential of these composite materials for supercapacitor-based applications.
SOLID STATE IONICS
(2023)
Article
Materials Science, Multidisciplinary
Shahid M. Ramay, Mohammed Shahabuddin, Nasser S. Alzayed
Summary: WO3-based semiconductor materials exhibit excellent electronic and optical properties. This study investigated the structure, electronic properties, and optical properties of WO3 materials with different compositions through simulations and experiments. It was found that Gd doping had a significant impact on the electronic and optical properties of the materials, making them more suitable for photovoltaic and optoelectronic applications.
MATERIALS RESEARCH EXPRESS
(2023)
Article
Zoology
Hafiz Abdullah Shakir, Iqra Javed, Muhammad Irfan, Shaukat Ali, Muhammad Khan, Farah Rauf Shakoori, Javed Iqbal Qazi, Muhammad Abrar Yousaf
Summary: This study optimized various physical parameters and medium components for maximum tannase production using corn leaves as substrate in solid state fermentation. The results showed that corn leaves can effectively reduce the production cost of tannase and serve as a low-cost substrate.
PAKISTAN JOURNAL OF ZOOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Abdul Quader, Ghulam M. Mustafa, Shahid M. Ramay, Shahid Atiq
Summary: The defect fluorite structure with A(2)B(2)O(7) composition has great potential in modern smart electrical devices. The synthesized Nd2-2xLa2xCe2O7 series exhibits the expansion of the fluorite structure and decreased grain size with the incorporation of La. However, the exact composition without impurity elements is confirmed. The pure Nd2Ce2O7 shows the highest energy storage efficiency and other desirable features for efficient energy storage.
