Dr. RAMESH KUMAR RAJI
@suranacollege.edu.in
Assistant Professor of Physics
Surana College Autonomous, South End Campus, Bangalore, Karnataka - 560004
Father’s Name : K. Raji
Mother’s Name : R. Mangammal
Spouse Name : V. Poncika
Date of Birth : 17/06/1993
Age : 30Y
Sex : Male
Marital Status : Married
Address : , Anaikkallanoor (Village), Noolahalli (Post), Sathiyanathapuram, Pennagaram (Taluk), Dharmapuri (District),
Pin code: 636813, Tamilnadu, India.
Nationality : Indian
EDUCATION
Jan 2016 – Sep 2021 Ph.D. (Physics – Materials Science) (Highly Recommended)
Department of Physics
College of Engineering Guindy
Anna university, Chennai-600025, INDIA.
Thesis: Investigations on structural, optical, magnetic and dielectric properties of rare earth/ Transition metal doped Lanthanum ferrite perovskites.
July 2013 - May 2015 - Master of Science (Physics - Materials Science)
Department of Physics
College of Engineering Guindy
Anna university, Chennai-600025, INDIA.
Percentage of Marks: 73.9 % (First Class)
Thesis: Growth of 4-Nitrophenol bulk single crystal by Vertical Bridgman technique (A+ Grade)
June 2010 - May 2013 Bachelor of Science (Physics),
Government Arts college, Dharmapuri,
Periyar University,
Salem, India, Percentage of Marks: 74.1 % (First Class)
June 2009 – April 2010 Higher Secondary Class (Maths, Physics, Chemistry, Biology)
Sri Vijay Vidyalaya (Boys) Mat. Hr. Sec School, Dharmapuri
Percentage of Marks: 76% (First class)
RESEARCH, TEACHING, or OTHER INTERESTS
Multidisciplinary, Condensed Matter Physics, Atomic and Molecular Physics, and Optics, Nuclear and High Energy Physics
FUTURE PROJECTS
Fabrication of high powder density based nanostructured electrode material for energy storage supercapacitor and photovoltaic applications.
Applications Invited
Scopus Publications
Scholar Citations
Scholar h-index
Scholar i10-index
Scopus Publications
M. Dhilip, Sundaramurthy Rameshkumar, Ramesh Kumar Raji, Tholkappiyan Ramachandran, J. Stella Punitha, F. Regan Maria Sundar Raj, K. Saravana Kumar, V. Anbarasu, Nandakumar Sekar, Rajivganthi Chinnathambi,et al.
Elsevier BV
Tholkappiyan Ramachandran, Fathalla Hamed, Yedluri Anil Kumar, Ramesh Kumar Raji, and H.H. Hegazy
Elsevier BV
Tholkappiyan Ramachandran, Fathalla Hamed, Ramesh Kumar Raji, Sanjit Manohar Majhi, Debabrata Barik, Yedluri Anil Kumar, RO. MU. Jauhar, M.P. Pachamuthu, L. Vijayalakshmi, and Sabah Ansar
Elsevier BV
Ramesh Kumar Raji, Tholkappiyan Ramachandran, Fathalla Hamed, and Srinivasa S
Hindawi Limited
Multiferroic materials have sparked significant interest in the realm of materials science because of their potential impact on various device applications. This study focuses on the synthesis of nanocrystalline La1−xPrxFeO3 (LPFO) materials, where x can be either 0 or 0.5, using a solid-state technique. The aim is to gain insights into their structural, optical, dielectric, and magnetic properties. To confirm the chemical phase of the synthesized materials, X-ray diffractometer and Raman spectroscopy were employed. The outcome of the Rietveld analysis reveals that the LPFO crystallites exhibit orthorhombic symmetry with a Pbnm space group. The functional groups that were present in the LPFO samples were identified using FT-IR spectroscopic analysis. The morphological studies using scanning electron microscope and transmission electron microscope indicate that the synthesized samples exhibit excellent homogeneity with uniformly distributed grains. In order to investigate the dielectric constant (εʹ) and dielectric loss (tan δ) were examined as functions of temperature and frequency. Pr3+ dopants had a notable impact on the dielectric characteristics, particularly within the frequency span of 10 kHz–1 MHz and over the temperature variation of 40–160°C. The ambient temperature magnetic properties of the LPFO ferrite materials displayed antiferromagnetic behavior. Ultimately, this research reveals insightful information on the structural, optical, dielectric, and magnetic properties of the synthesized nanocrystalline LPFO materials, shedding light on their potential applications in the multifunctional devices.
Tholkappiyan Ramachandran, Abdel‐Hamid I. Mourad, Ramesh Kumar Raji, Ramachandran Krishnapriya, Nizamudeen Cherupurakal, Abdul Subhan, and Yarub Al‐Douri
Hindawi Limited
In recent years, there has been much focus on how the structure and morphology of CoMn2O4 materials influence their electrochemical performance. Herein we introduce a KOH‐surfactant agent to form a hexagonal like‐CoMn2O4 via hydrothermal. The X‐ray Rietveld refinement evidenced that spinel CoMn2O4 with the tetragonal structured I 41/amd phase. Further, the chemical environment of this phase is identified using various techniques. Surface morphology studies revealed hexagonal‐like features. Owing to its features, the material delivers an excellent capacitance of 638.8 F/g. CoMn2O4 also shows attained columbic efficiency of 81% and retains a capacitance of 85% after 4000 charge‐discharge cycles. The excellent cyclic stability and high performance are achieved due to the more active sites and convenient electronic transference route for the ions through an electrochemical process. The symmetrical two‐electrode assembly has also been fabricated. Hence, we believed that the surfactant‐KOH mediated hexagonal‐like‐CoMn2O4 material should enhance the supercapacitor properties.
Ramesh Kumar Raji, Tholkappiyan Ramachandran, M. Muralidharan, R. Suriakarthick, M. Dhilip, A. Raja, K. Aravinth, S. Karthikeyan, P. Ramasamy, Vishista Kurapati,et al.
Springer Science and Business Media LLC
Tholkappiyan Ramachandran, Fathalla Hamed, Ramesh Kumar Raji, and Abdel Hamid I. Mourad
IEEE
In this study, we presented a novel and coprecipitation chemical strategy for the synthesis of garnet type-Dy3Fe5O12 ferrite nanopowders using NaOH as a surfactant along containing nitrates of matching metals. The resultant powders were heat treated at 1200◦C for 6 h and analyzed by XRD, SEM, EDS, and VSM techniques respectively. X-ray diffraction studies of the synthesized sample confirms a mono phase-garnet structured compound with an average crystallite size of 30.3 nm. The morphology of the samples has seen in the SEM images, as tiny crystallite particles in agglomeration. The magnetization exhibited a ferromagnetic behavior, due to the occupancy of cations at Td and Oh sites. Our work suggests that a coprecipitation chemical approach for the synthesis of garnet type Dy3Fe5O12 ferrite nanopowders can be employed in a variety of technological applications as a potential material.
Ramesh Kumar Raji, Tholkappiyan Ramachandran, M. Muralidharan, R. Suriakarthick, M. Dhilip, A. Raja, Vishista Kurapati, Fathalla Hamed, P. Ramasamy, and Abdel-Hamid I. Mourad
Springer Science and Business Media LLC
Ramesh Kumar Raji, Tholkappiyan Ramachandran, M. Muralidharan, R. Suriakarthick, Muthu Dhilip, Fathalla Hamed, and Vishista Kurapati
Walter de Gruyter GmbH
Abstract Perovskite structured LaTixFe1-xO3 (x = 0, 0.05, 0.15, 0.25) lanthanum ferrites were synthesized by conventional solid-state reaction. The structural Rietveld refinement and Raman analysis were conducted and confirmed that single-phase orthorhombic phase with Pbnm symmetry formed. The positions of the ions and their bonds of these ferrites were investigated. The spherical shaped morphology of these ferrites was examined. The quantitative chemical composition and distribution of these ferrites were confirmed. The excitonic absorption edge was observed at 590 nm; ascribed to the electronic transition from O2p→Fe3d and optical band gap values increased from 1.85– 2.02 eV as Ti concentration increased. The dielectric and magnetic behavior of these ferrites was studied. It is suggested that synthesized LaTixFe1xO3 powders with different properties could be tailored for different requirements.
Ramesh Kumar Raji, Vishista Kurapati, Tholkappiyan Ramachandran, M. Muralidharan, R. Suriakarthick, M. Dhilip, and Fathalla Hamed
Springer Science and Business Media LLC
R. Raji and K.G. Gopchandran
Elsevier BV
R. Raji, R.G. Abhilash Kumar, and K.G. Gopchandran
Elsevier BV
R. Raji and K.G. Gopchandran
Elsevier BV
Raji R., Sibi K.S., and Gopchandran K.G.
Elsevier BV
R. Raji and K.G. Gopchandran
Elsevier BV
R Raji and K G Gopchandran
IOP Publishing
In this work, we report the synthesis of ZnO:Cu nanoparticles with rod-like morphology using co-precipitation method. X-ray diffraction analysis indicated that these ZnO:Cu nanoparticles has wurtzite structure with preferential growth along (1 0 1) crystal plane. The formation of additional defect levels in these particles on doping with Cu was investigated using Raman and fluorescence spectroscopy. The increase in intensity of E1 (LO) mode observed at ~580 cm−1 in the Raman spectra of ZnO:Cu nanoparticles, confirmed the formation of additional defect levels in these nanoparticles on doping with Cu. The doping concentration was evident in the intensity of the additional Raman mode observed at ~280 cm−1 for the Cu doped nanoparticles. Photoluminescence spectra of Cu doped ZnO nanoparticles shows three visible emission peaks at 413, 435 and 531 nm along with a UV emission peak at 390 nm, whereas undoped ZnO nanoparticles showed only two peaks, at 389 and 582 nm. The shrinkage in band gap causing the emission of violet, blue and green colors on doping with Cu are attributed to the s-d and p-d exchange interactions between conduction band electrons of ZnO and localized d electrons of Cu ions, resulting in renormalization of band gap. The emission bands observed in these ZnO:Cu nanoparticles has been illustrated with a schematic energy level diagram.
R. Ramesh Kumar, P. Sathya, and R. Gopalakrishnan
Author(s)
Benzotriazolium p-toluene sulfonate (BTPTS) was grown by solution growth technique. The powder X-ray diffraction analysis was carried out to evaluate crystal system of the compound. LeBail Profile fitting analysis was performed to extract the individual peak intensities. FTIR spectrum analysis was recorded to study vibration frequencies of the prepared organic salt. Thermal studies were carried out using TG-DSC analysis. Optical absorption and energy band gap of the title compound was evaluated by UV-Vis spectral study.
R. Raji, Deepak Mishra, and Madhu S. Nair
Elsevier BV