Ranadip Kundu
@chaibasaengg.edu.in
Associate Professor, Electronics and Communication Engineering
Chaibasa Engineering College
EDUCATION
PhD (Engineering)
RESEARCH INTERESTS
Nanomaterials, Nanotechnology, Material Science
Scopus Publications
Scholar Citations
Scholar h-index
Scholar i10-index
Scopus Publications
Sanjib Bhattacharya, Ranadip Kundu, Koyel Bhattacharya, Asmita Poddar, and Debasish Roy
Elsevier BV
Anindya Sundar Das, Madhab Roy, Dipankar Biswas, Ranadip Kundu, Amartya Acharya, Debasish Roy, and Sanjib Bhattacharya
IOP Publishing
Transition metal oxide (TMO) doped different types of semiconducting glassy systems of the common terminology as 0.3V2O5–0.7 (0.05AmOn–0.95ZnO) for AmOn = MoO3, SeO2, Nd2O3, and CdO have been prepared by melt quenching route. The frequency and temperature dependent conductivity of all the as-quenched glass nanocomposite samples has been investigated over a wide temperature and frequency range. Conductivity, depending on temperature and frequency, is well established using Jonscher’s universal power law and Almond-West formalism. The values of DC conductivity (σdc), polaron hopping frequency (ωH), frequency exponent (n), and power law exponent (s) have been computed. The value of n indicates three-dimensional motions of charge carriers or polarons, which is the main reason for high-frequency dispersion in the ac conductivity. The estimated values of activation energy of ac conduction (Eac), free energy of polaron migration (EH) and activation energy of DC conductivity (Edc) are mainly owing to polaron transport with the energy level in the optical band gap. Ac conductivity and temperature dependent power-law exponent (s) of the as-prepared glassy samples containing MoO3 and Nd2O3 are dominated by non-overlapping small polaron tunneling (NSPT). Conversely, correlated barrier hopping (CBH) solely controls the ac conductivity and temperature dependent power-law exponent (s) of the glassy samples containing SeO2 and CdO. It is ascertained that mobile charge carrier concentration is independent of temperature and only 20%–25% of the total charge carriers (polarons) contribute to the ac conductivity of the presently studied glassy systems.
Dipankar Biswas, Ranadip Kundu, Anindya Sundar Das, Madhab Roy, Debasish Roy, L.S. Singh, and Sanjib Bhattacharya
Elsevier BV
Arun Kr Bar, Koyel Bhattacharya, Ranadip Kundu, Debasish Roy, and Sanjib Bhattacharya
Elsevier BV
Ranadip Kundu, Debasish Roy, and Sanjib Bhattacharya
Wiley
Ranadip Kundu, Debasish Roy, and Sanjib Bhattacharya
Elsevier BV
Ranadip Kundu, Sanjib Bhattacharya, Debasish Roy, and P. M. G. Nambissan
Royal Society of Chemistry (RSC)
The results of XRD, TEM, UV-Vis absorption and positron annihilation studies of xAg2O–(1 − x)(0.3CdO–0.7MoO3) nanocomposites, x = 0.0–0.9, are reported.
Arun Kr. Bar, Koyel Bhattacharya, Ranadip Kundu, Debasish Roy, and Sanjib Bhattacharya
Elsevier BV
Ranadip Kundu, Debasish Roy, and Sanjib Bhattacharya
Author(s)
Zno doped silver-molybdate glass-nanocomposites, 0.3 Ag2O - 0.7 [0.075 ZnO – 0.925 MoO3] have been prepared by melt-quenching method. Ionic conductivity of these glass-nanocomposites has been measured in wide temperature and frequency windows. Vicker’s hardness methods have been employed to study micro-hardness of the as-prepared samples. Heat-treated counterparts for this glass-nanocomposites system has been analyzed in different temperature to observe the changes in conductivity as well as micro-hardness for that system.
Arun Kr. Bar, Ranadip Kundu, Debasish Roy, and Sanjib Bhattacharya
Author(s)
In this paper the room temperature micro-hardness of selenite glass-nanocomposites has been measured using a Vickers and Knoop micro hardness tester where the applied load varies from 0.01N to 0.98 N. A significant indentation size effect was observed for each sample at relatively low indentation test loads. The classical Meyer’s law and the proportional specimen resistance model were used to analyze the micro-hardness behavior. It was found that the selenite glass-nanocomposite becomes harder with increasing CuI composition and the work hardening coefficient and mechanical properties like Young modulus, E, were also calculated. Our results open the way for the preparation, application and investigation of significant mechanical properties of new type of glass-nanocomposites.
Arun Kumar Bar, Ranadip Kundu, Debasish Roy, and Sanjib Bhattacharya
Author(s)
The present study mainly focuses on the electrical relaxation data of some glass-nanocomposites. We have prepared xCuI- (1-x)(0.5CuO - 0.5SeO2) where x = 0.2 and 0.5 using melt-quenching method. Ionic relaxation data of these glass-nanocomposites have been analyzed in the framework of the electric modulus formalism. Conductivity relaxation frequency (τc) has been computed from the maximum value (M//max) of the imaginary modulus M//. It is also observed that the conductivity relaxation process is highly non-exponential. The variation of conductivity relaxation time is correlated with their structure.
Sanjib Bhattacharya, Ranadip Kundu, Anindya Sundar Das, and Debasish Roy
Elsevier BV
Ranadip Kundu, Debasish Roy, and Sanjib Bhattacharya
Informa UK Limited
Ionic conductivity and conductivity relaxation of ZnO doped silver molybdate glass-nanocomposite systems have been studied. X-ray diffraction studies have been carried out to obtain the particle size and the distribution of ZnO, Ag2MoO4, Ag2Mo2O7 and Ag6Mo10O33 nanoparticles dispersed in glass-nanocomposites. A symmetric stretching of the Mo–O octahedral units has been found in the FTIR study. It has also been noted that as ZnO content increases, the bond strength of Mo–O becomes weaker. Ionic relaxation data of glass-nanocomposites have been analyzed in the framework of the electric modulus formalism. It has been observed that the electrical conductivity depends upon the ZnO content added to the system.
Arun Kr. Bar, Debasish Roy, Ranadip Kundu, M.P.F. Graca, M.A. Valente, and Sanjib Bhattacharya
Elsevier BV