Article
Materials Science, Ceramics
Pinki Yadav, Ankur Sharma, Himanshu Srivastava, Indranil Bhaumik, Gurvinderjit Singh, V. S. Tiwari
Summary: A correlation between piezoelectricity and photoluminescence in europium doped (Na0.41K0.09Bi0.5)TiO3 ceramic was investigated, showing an optimum response at 1.0 at.% Eu doping concentration. While photoluminescence intensity increased with Eu concentration, a quenching effect on the hypersensitive 5D0 -> 7F2 transition was observed under an electric field in samples with lower Eu doping concentration.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
Mohamed Aissa, Moneim Zannen, Mohammed Hadouchi, Hend Kacem, Jamal Belhadi, Hassan A. H. Alzahrani, Abdallah Aissa, Mimoun El Marssi, Mustapha Majdoub, Abdelilah Lahmar
Summary: The correlation between the phase structure, dielectric, and ferroelectric properties of lead-free polycrystalline ceramics was investigated. The crystallographic transformation, dielectric diffuseness, depolarization temperature, and lattice disorder were analyzed. Raman spectroscopy and I-E loops were used to study the composition-dependent behavior and phase transition.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Inorganic & Nuclear
Najah Rhimi, N. Dhahri, M. Khelifi, E. K. Hlil, J. Dhahri
Summary: This work focuses on studying the properties of sodium bismuth titanate (NBT) ceramic, including its structure, optical properties, and electrical properties. The material exhibited a poly-crystalline structure with a rhombohedral shape, and a grain size of 29.17 μm. The dielectric loss and dielectric constant increased with frequency, and the conduction mechanism followed the correlated barrier hopping (CBH) and small polaron hopping (SPH) models. The study provides valuable insights into the physical characteristics of NBT and its potential applications in the industry.
INORGANIC CHEMISTRY COMMUNICATIONS
(2022)
Article
Chemistry, Physical
Prachi Chaudhary, Rishabh Shukla, Samiksha Dabas, O. P. Thakur
Summary: This study investigates the effects of Nb substitution on the properties of a multiferroic solid solution, revealing significantly enhanced magnetic and dielectric properties in Nb-substituted samples, making them suitable for memory device applications. Additionally, changes in the structure and the coupling between electric and magnetic dipoles were confirmed through various analytical techniques.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
Najah Rhimi, N. Dhahri, J. Laifi, F. Bourguiba, N. Abdelmoula, J. Dhahri, C. Castro, J. Juraszek
Summary: This research investigates the enhancement of electrical and optical performance of Na0.5Bi0.5TiO3 ceramic by introducing BiCu0.75W0.25O3 solid solution, resulting in a novel Lead-free solid solution 0.995(Na0.5Bi0.5TiO3)-0.005(BiCu0.75W0.25O3) with improved properties suitable for power electronic devices.
JOURNAL OF MOLECULAR STRUCTURE
(2023)
Article
Materials Science, Multidisciplinary
Hiral D. Shah, D. A. Dadhania, J. A. Bhalodia
Summary: This study synthesizes (1 -x)PbTiO3 + (x)La0.7Sr0.3MnO3 composite samples and investigates their structural, ferroelectric, dielectric, and impedance properties. The results show that the composite samples have PbTiO3 phase with a tetragonal structure and LSMO phase with a tetragonal structure. The variation of grain growth and dielectric properties change with the increase of LSMO content.
MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS
(2022)
Article
Chemistry, Physical
Shalendra Kumar, Faheem Ahmed, Nagih M. Shaalan, Rajesh Kumar, Adil Alshoaibi, Nishat Arshi, Saurabh Dalela, Fatima Sayeed, Sourabh Dwivedi, Kavita Kumari
Summary: Spherical CoFe2O4 magnetic nanostructures were successfully synthesized via a microwave-assisted hydrothermal method. Characterization techniques including XRD, FE-SEM, EDX spectroscopy, HR-TEM, SAED, DC magnetization, and dielectric spectroscopy were used to investigate the prepared nanostructures. The results revealed that the nanostructures had a single-phase nature, ferromagnetic ordering at room temperature, and a normal dispersion behavior in dielectric spectroscopy.
Article
Materials Science, Multidisciplinary
Pooja Pant, Harshit Agarwal, Suresh Bharadwaj, M. A. Shaz
Summary: This study provides a detailed investigation on the structural correlation and electrical properties of transition metal-doped GdMnO3. The analysis using XRD, Raman spectroscopy, and X-ray photoelectron spectroscopy reveals the influence of Cr and Fe doping on the structure and octahedral distortion in GdMn1-xTxO3. The study also shows the anomalous changes in the dielectric behavior and activation energy, indicating a transition from insulating to semiconducting nature in the doped materials.
MATERIALS CHEMISTRY AND PHYSICS
(2022)
Article
Chemistry, Physical
Khalid Mujasam Batoo, Ritesh Verma, Ankush Chauhan, Rajesh Kumar, Muhammad Hadi, Omar M. Aldossary, Y. Al-Douri
Summary: This study reported the synthesis of Gd and Nb co-doped BT ceramic oxides and investigated their structural and electrical properties. Various analysis techniques were used to characterize the samples, revealing the influence of Gd and Nb doping on the electrical properties of the ceramic materials, which were found to improve with increasing dopant concentration.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
Abhinav Yadav, Manisha Kumari, P. M. Sarun
Summary: Lead-free polycrystalline NaNb1-xVxO3 (NV: 0.00 < x < 0.06) samples were prepared and investigated for their dielectric and electrical properties in different polymorphic phases. The study found that temperature and V-content affect both grain resistance and grain-boundary resistance.
MATERIALS CHEMISTRY AND PHYSICS
(2021)
Article
Materials Science, Multidisciplinary
Ravi Kant, Vaibhav Ahuja, Kavya Joshi, Haritik Gupta, Sumit Bhardwaj
Summary: In this study, pure and Ni-doped ZnO/rGO nanocomposites were prepared using a cost-effective wet chemical method, and their dielectric characteristics were explored. The addition of rGO increased the dielectric constant and dielectric loss at low frequency region in the nanocomposites. The ac conductivity of the nanocomposites gradually increased with frequency.
Article
Physics, Condensed Matter
Muhammad Zain Yar, Muhammad Khalid, Muhammad Yasin, Kiran Naz, Muhammad Gul Bahar Ashiq, Muhammad Younas, Thamraa Alshahrani, Khaild I. Hussein, Khizar Bin Hassan, Bilal Ahmed, M. Mohamed Javid
Summary: The manganese-substituted nickel-rich lithium-cobalt oxide Li2Ni6MnxCo2-xO10 was successfully synthesized using the sol-gel autocombustion method. The structure and morphology of the material were characterized by XRD and SEM techniques, respectively. The prepared nanomaterial exhibited a hexagonal structure with a secondary phase. The average crystallite size was determined to be between 12 and 27 nm using different methods. SEM analysis showed the surface morphology and particle size distribution. The dielectric characteristics of the material were frequency-dependent, indicating suitability for high-frequency devices. Magnetic measurements revealed variations in saturation magnetization and coercivity with increasing Mn concentration. The obtained dielectric properties suggest potential applications in energy storage.
PHYSICA B-CONDENSED MATTER
(2023)
Article
Materials Science, Ceramics
Hemaunt Kumar, Puneet Negi, Jitendra Pal Singh, R. C. Srivastava, Subia Ambreen, K. Asokan
Summary: This study investigates the structural, electrical and transport properties of cobalt nanoferrites (CoFe2O4) doped with dysprosium cation (Dy3+) on the iron (Fe3+) site. The results confirm that the samples maintain a pure cubic spinel structure. The average crystallite size ranges from 49 to 72 nm and is not affected by the concentration of Dy3+ ions. The lattice parameters vary from 8.34 Å for pristine CoFe2O4 to 8.39 Å for the sample with the highest doping concentration (Dy(x) = 0.15). The porosity decreases with increasing Dy3+ ion concentration. The electrical properties are analyzed through dielectric behavior at different frequencies and temperatures. The ferrite with Dy(x) = 0.15 exhibits the highest dielectric constant in the range of 441 to 5234, indicating its suitability for memory storage devices.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
Zahid Hasan, Hasan Khaled Rouf, Mohammed Nazrul Islam Khan
Summary: Multiferroic composites of (1-x) Ba0.77Ca0.23TiO3 + x Ni0.6Zn0.25La0.15Fe2O4 have been synthesized and their properties systematically investigated. The XRD and SEM analyses show the structural and grain size changes, while VSM measurements reveal the magnetic behavior with increasing ferrite content. The dielectric constant behavior with frequency and AC conductivity from dielectric properties are also described.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2022)
Article
Chemistry, Physical
Vitalii Turchenko, A. S. Bondyakov, Sergei Trukhanov, Ignasi Fina, V. V. Korovushkin, Maria Balasoiu, Silviu Polosan, Bernat Bozzo, Nicoleta Lupu, Alex Trukhanov
Summary: The microscopic mechanism of ferroelectric properties in M-type barium hexaferrites is investigated using experimental and first-principle computation methods. The correlation between thermal factors in sample annealing process and functional properties is confirmed through magnetic, X-ray, and Mossbauer measurements. The occurrence of remnant polarization in barium hexaferrites at room temperature contradicts the description of their crystal structure, suggesting a direct relationship between remnant polarization and broken spatial-inversion symmetry.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Jarnail Singh, Vikram Verma, Ravi Kumar
Article
Materials Science, Multidisciplinary
Jarnail Singh, Vikram Verma, Rajesh Kumar, Sandeep Sharma, Ravi Kumar
MATERIALS RESEARCH EXPRESS
(2019)
Correction
Materials Science, Multidisciplinary
Jarnail Singh, Vikram Verma, Rajesh Kumar, Sandeep Sharma, Ravi Kumar
MATERIALS RESEARCH EXPRESS
(2019)
Article
Materials Science, Multidisciplinary
Jarnail Singh, Vikram Verma, Rajesh Kumar, Ravi Kumar
MATERIALS RESEARCH EXPRESS
(2019)
Article
Materials Science, Multidisciplinary
Kapil Dev Singh, Fouran Singh, R. J. Choudhary, Ravi Kumar
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2020)
Article
Engineering, Electrical & Electronic
Jarnail Singh, Rajesh Kumar, Vikram Verma, Ravi Kumar
Summary: Transparent and conducting epitaxial thin films of pristine chromium oxide (Cr2O3) and nickel (Ni) substituted Cr2O3 were deposited on sapphire substrates using pulsed laser deposition (PLD) technique. The addition of nickel (Ni) led to an increase in carrier concentration and a decrease in optical band gap energy. This material has potential applications in optoelectronics due to its high transparency and conductivity properties.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2021)
Article
Materials Science, Ceramics
F. H. Bhat, G. Anjum, Ravi Kumar, Manzoor A. Malik, R. J. Choudhary, D. K. Shukla
Summary: Polycrystalline LaMn1-xCoxO3 (0.1 <= x <= 0.5) samples synthesized using conventional ceramic method exhibit strong magnetic properties with double transition and spin glass state. These characteristics are mainly influenced by the interactions between Co and Mn ions, showing significant magnetoresistance effects.
CERAMICS INTERNATIONAL
(2021)
Article
Physics, Condensed Matter
Sumit Bhardwaj, J. D. Sharma, Subhash Chand, K. K. Raina, Ravi Kumar
Summary: Lead-free ceramic-polymer nanocomposites were synthesized using the solution casting method, with homogeneously dispersed BLT ceramic particles enhancing the electroactive phases of PVDF. The nanocomposites exhibited superior dielectric and ferroelectric properties, showing potential in flexible sensors, data storage, and energy harvesting applications.
SOLID STATE COMMUNICATIONS
(2021)
Article
Chemistry, Inorganic & Nuclear
Pankaj Bhardwaj, Jarnail Singh, Rajesh Kumar, Ravi Kumar, Vikram Verma
Summary: In this study, the suitability of chromium oxide as diluted magnetic oxide was systematically investigated, with nanoparticles doped with Ni2+ ions successfully synthesized. Various analyses confirmed the structural characteristics of the nanoparticles and revealed the presence of oxygen defects. The study also demonstrated marginal changes in optical bandgap and weak room temperature ferromagnetism in the doped nanoparticles.
SOLID STATE SCIENCES
(2021)
Article
Materials Science, Multidisciplinary
Mohd. Hashim, Nehru Boda, Ateeq Ahmed, S. K. Sharma, D. Ravinder, Edapalli Sumalatha, Anwar Ul-Hamid, Mukhlis M. Ismail, Mohd. Chaman, Sagar E. Shirsath, Ravi Kumar, Shalendra Kumar, Sher Singh Meena, Mohammad Nasir
Summary: In this study, samarium-doped cobalt ferrite nanoparticles were synthesized using citrate gel auto-combustion method and annealed at 500 degrees C for 4 hours. The doping of samarium was found to strongly influence the magnetic properties of the nanoparticles, leading to a decrease in saturation magnetization values. Rietveld analysis confirmed the formation of a single-phase structure in all compositions.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Jitender Kumar, Rajesh Kumar, Mukhtiyar Singh, Shalendra Kumar, Ravi Kumar, Sung Ok Won, Ranjeet Brajpuriya, Sourabh Dwivedi, Ram K. Sharma, Ankush Vij
Summary: The study investigated the structural, reflectance, photoluminescence, and thermoluminescence properties of t-Mg2B2O5 nanostructures synthesized using an optimized combustion method. The direct band gap of 5.23 eV was determined, contrary to previous reports, and first principle calculations confirmed this. The t-Mg2B2O5 nanoparticles exhibited yellow-reddish photoluminescence and UV responsive thermoluminescence, suggesting potential applications in luminescence-based technologies and UV dosimetry. Additionally, the study demonstrated the anti-biofilms activity of Mg2B2O5 nanoparticles against pseudomonas aeruginosa bacterial cells.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2021)
Article
Engineering, Chemical
Amarjit Singh, Harish Singh Dhami, Manoj Kumar Sinha, Ravi Kumar
Summary: This article presents a detailed study of the mineralogy, micromeritics, and rheology of various materials, including powders and metal chips. The density and morphology of the particles were found to greatly influence their properties. The study also suggests that waste metallic chips can be recycled through powder metallurgy, saving time compared to ball milling.
Article
Engineering, Electrical & Electronic
Kapil Dev Singh, Dinesh Kumar Shukla, Ravi Kumar
Summary: By utilizing x-ray absorption near-edge spectroscopy (XANES) measurements, we investigated the electronic structure of perovskite-type RCrO3 (R = La, Nd, Eu, Gd, Dy, and Y) compounds. The results showed significant differences in the framework of the metal-oxygen hybridization caused by different rare earth elements (R). The dominant role of Cr3+ was found in all these perovskite-type RCrO3 samples, except for EuCrO3 where Cr existed in a mixed-valence state of +3 and +4. The ligand field-splitting values increased consistently with decreasing rare-earth (R) cationic radii, except for an anomaly in the case of Eu.
JOURNAL OF ELECTRONIC MATERIALS
(2022)
Proceedings Paper
Multidisciplinary Sciences
Sacheen Kumar, Nav Deepak, Ravi Kumar
ADVANCES IN BASIC SCIENCES (ICABS 2019)
(2019)
Proceedings Paper
Physics, Applied
Jarnail Singh, Vikram Verma, Ravi Kumar
DAE SOLID STATE PHYSICS SYMPOSIUM 2018
(2019)
