Ramesh Thotakura
@bvrithyderabad.edu.in
Assistant Professor Department of Physics
BVRITHYDERABAD College of Engineering for Women
EDUCATION
PhD ( Materials science) from Osmania University
RESEARCH INTERESTS
Ceramics, magnetic materials, composites, sensor
Scopus Publications
Scholar Citations
Scholar h-index
Scholar i10-index
Scopus Publications
P. Sowjanya, G. Thirupathi, M. Sharath Kumar, T. Ramesh, M.V. Ramana Reddy, Arout Chelvane, and N. Pavan Kumar
Elsevier BV
T. Ramesh, P. Usha, P. Neelima, and N. Pavan Kumar
The Electrochemical Society
This study aims to investigate the impact of substituting Dy3+ ions on the structural, magnetic and dielectric properties of Nickel Zinc (Ni-Zn) ferrites, which have the chemical formula Ni0.5Zn0.5DyxFe2-xO4 (where x = 0, 0.01, 0.03, 0.05, 0.07, and 0.09). These ferrites were synthesized using a microwave hydrothermal technique with different process parameters. Structural characterization of the synthesized powders was carried out using X-ray diffraction (XRD) and Fourier transformation infrared spectroscopy (FTIR). The XRD analysis confirmed the presence of a pure spinel phase for Dy concentrations (x) up to 0.05. However, when x ≥ 0.07, an additional orthoferrite phase (DyFeO3) was observed along with the spinel phase. FTIR spectra revealed a shift in low-frequency wave numbers due to Dy3+ ion substitution. The size and morphology of the synthesized powder particles were examined using field emission scanning electron microscopy (FESEM). The powder compacts were sintered using microwave processing at 900 °C for 40 min. The increase in dc. resistivity is observed with an increase in Dy3+ concentration, mainly due to the change in the hopping mechanism with the substitution concentration. Dielectric properties such as dielectric constant and loss are measured in the frequency range of 100 Hz to 1.8 GHz. The high value of dielectric constant and loss observed in the low-frequency region compared to the high-frequency region. Maxwell’s Wagner model and ‘Koop’s theory explains the variation in dielectric properties with the frequency. The magnetic hysteresis loops were measured at different temperatures and observed to enhance the low-temperature magnetic properties compared to room temperature. The results suggest that the magnetic and dielectric properties of the investigated samples can be adjusted by varying the concentration of Dy3+ ions, providing the ability to tailor these properties according to specific application requirements.
T. Suresh Kumar, G. Sriramulu, P. Raju, T. Ramesh, K. Praveena, and S. Katlakunta
The Electrochemical Society
The microwave hydrothermal method has been used to synthesize MgFe2-x Ce x O4 (x = 0.0 – 0.10) nanoparticles, which have been characterized using X-ray diffraction (XRD), fourier transform Infrared spectroscopy (FTIR), field emission scanning electron microscopy (FE-SEM), X-ray photoelectron spectroscopy (XPS), UV–vis spectrometer, vibrating sample magnetometer (VSM) and dielectric properties. XRD investigation confirms the cubic spinel structure, and the Debye–Scherrer formula was used to determine the crystallite size, showing values of 19 – 108 nm. FTIR confirms the presence of all functional groups and FE-SEM displays particle-like morphology. The UV-visible analysis was used to explain the variation of the optical bandgap as Ce3+ doping increased. VSM analysis of MgFe2-x Ce x O4 showed ferromagnetic behaviour. The samples exhibit low magnetization values ranging from 8.83 emu g−1 to 18.91 emu g−1. The values of the dielectric constant (ε′) and the dielectric loss (tanδ) decreased with frequency due to the influence of space-charge polarization and showed a dispersive behaviour at higher frequencies.
Puli Nageshwer Rao, K. Chandra Sekhar, T. Ramesh, M Chandra Shekhar Reddy, Kodumuri Veerabhadra Rao, Md. Shareefuddin, and B. Appa Rao
Springer Science and Business Media LLC
T. Ramesh, K. Sadhana, and K. Praveena
Springer Science and Business Media LLC
P. Neelima, P. Usha, T. Ramesh, and Kiran Kumar Ganta
Springer Science and Business Media LLC
Thotakura Ramesh, Basireddy Sravanthi, Kollu Ashok, A. Bhaskar, and Anji Reddy Polu
Wiley
Thotakura Ramesh, M. Chandra Shekhar Reddy, Basireddy Sravanthi, Anjireddy polu, and P. Nageswar Rao
Wiley
Surasi Kiran, Konagolla Saibaba, Thotakura Ramesh, Kollu Ashok, and Anji Reddy Polu
Wiley
Anji Reddy Polu, Pramod K Singh, P Siva kumar, Girish M Joshi, T Ramesh, IM Noor, Aysh Y Madkhli, and Sunanda Kakroo
SAGE Publications
Ion conducting solid polymer electrolyte films based on polymer poly (ethylene oxide) (PEO) complexed with 2-trifluoromethyl-4, 5-dicyanoimidazole lithium salt and ionic liquid (IL) 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide are synthesized using anhydrous acetonitrile as solvent. Prepared electrolyte films are characterized by X-ray diffraction (XRD), differential scanning calorimetry (DSC), complex impedance spectroscopy and cyclic voltammetry techniques. Incorporation of IL into the PEO20-LiTDI polymer electrolyte changes different physicochemical properties of these materials. By characterizations, particularly XRD, DSC and ionic conductivity studies, the synthesized SPEs showed decreased crystallinity, melting points and increased ionic conductivity by the introduction of ionic liquid. The 40 wt% of IL doped polymer electrolyte showed an ionic conductivity of the order of 1.78 × 10−4 S/cm at 60°C with better thermal stability. The optimum conducting composition showed very good electrochemical stability window at ambient temperature. These results suggested that the IL-doped polymer electrolyte would be a potential separator in Li-ion batteries.
T. Ramesh, B. Sravanthi, G. Umadevi, K. Ramaiah, B. Anna Tanuja Safala, and T. Suneetha
Springer Science and Business Media LLC
T. Ramesh, B. Sravanthi, Kiran Kumar Ganta, K. Praveena, J. Naga Vishnu Vardhan, and Anji Reddy Polu
Springer Science and Business Media LLC
T. Ramesh, V. Madhavi, P. Neelima, K. Nagendra Kumar, N. Bakthavatchala Reddy, and Grigory V. Zyryanov
AIP Publishing
V. Madhavi, T. Ramesh, N. Bhakthavatchala Reddy, and Grigory V. Zyryanov
AIP Publishing
T. Suneetha, G. Narayana Rao, and T. Ramesh
Springer Science and Business Media LLC
N. Maramu, G. Sriramulu, T. Ramesh, D. Ravinder, S. Katlakunta, T. Anil Babu, and N. V. Krishna Prasad
Springer Science and Business Media LLC
V. V. Ramakrishna, S. Kavita, T. Ramesh, Ravi Gautam, and R. Gopalan
Springer Science and Business Media LLC
P. Neelima, T. Ramesh, P. Raju, and S. R. Murthy
Springer Science and Business Media LLC
S. Kiran, T. Ramesh, and S. R. Murthy
Springer Science and Business Media LLC
T. Ramesh, G. Narayana Rao, T. Suneetha, R. S. Shinde, V. Rajendar, S. R. Murthy, and S. Arun Kumar
Springer Science and Business Media LLC
Narayana Rao Gurram, Ramesh T., Suneetha T., and T. K. Nath
Springer Science and Business Media LLC
T. Ramesh, R. S. Shinde, S. Senthil Kumar, and S. R. Murthy
Springer Science and Business Media LLC
T. Ramesh, V. Rajendar, and S. R. Murthy
Springer Science and Business Media LLC
T RAMESH and S R MURTHY
Springer Science and Business Media LLC
T. Ramesh, S. Senthil Kumar, R. S. Shinde, and S. R. Murthy
AIP Publishing LLC
The effect of substitution of nonmagnetic Al3+ ions on the structural and electromagnetic properties were studied in nanocrystalline ferrite series of Mg0.8Cu0.2AlxFe1.95-xMn0.05O4 where x varies 0-0.4 in steps of 0.1. This series was synthesized by using microwave hydrothermal method. The nanocrystalline ferrite phase was observed at temperature 150°C/40 min. Synthesized powders were characterized using X-ray diffraction (XRD) and transmission electron microscopy (TEM). The synthesized powders were densified using microwave sintering method at 950°C/40 min. The sintered samples were characterized using XRD. Surface morphology was observed by using field effective scanning electron microscopy (FESEM). The electrical and magnetic properties were measured at room temperature. These results led us to interfere that the values of d.c resistivity increases and dielectric constant, initial permeability, saturation magnetization and Curie temperature were observed to be decreased with the substitution of Al3+ io...