Published by: NISCAIR, CSIR, New Delhi
Subjects: Physics
Started in 1963, this journal publishes Original Research Contribution as full papers, notes and reviews on classical and quantum physics, relativity and gravitation; statistical physics and thermodynamics; specific instrumentation and techniques of general use in physics, elementary particles and fields, nuclear physics, atomic and molecular physics, fundamental area of phenomenology, optics, acoustics and fluid dynamics, plasmas and electric discharges, condensed matter-structural, mechanical and thermal properties, electronic, structure, electrical, magnetic and optical properties, cross-disciplinary physics and related areas of science and technology, geophysics, astrophysics and astronomy. It also includes latest findings in the subject under News Scan.
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ISSN No. : 0019-5596
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Study of diffusion and conduction in gamma irradiated solid polymer electrolytes by fractal model structure
Title: Study of diffusion and conduction in gamma irradiated solid polymer electrolytes by fractal model structure
Authors: Ghosal, Subhasish; Ray, Ruma; Ballabh, T K; Tarafdar, S
Abstract: Gamma irradiation
changes the polymer microstructure and improves the ionic conductivity of Solid
Polymer Electrolytes (SPE). The present paper introduces a deterministic
fractal model of polymer molecules to study the effect of gamma irradiation on
it. The effect of irradiation is implemented by repeated scission of molecules
resulting in variation in polymer morphology. The ionic conductivity is assumed
to be proportional to the effective velocity of ions. The velocity is
calculated considering the trapping effect due to the random movement of ions
through the large fractal polymer molecules and the segmental motion of the
branches. Calculated conductivity is compared with the experimental curves
which show a qualitative agreement.
Page(s): 324-327
Investigation on electrical and dielectric properties of PVP:KCLO4 polymer electrolyte films
Title: Investigation on electrical and dielectric properties of PVP:KCLO4 polymer electrolyte films
Authors: Ravi, M; Bhavani, S; Pavani, Y; Rao, V V R Narasimha
Abstract: Solid polymer electrolyte based on poly (vinyl pyrrolidone) (PVP) complexed
with different weight per cent ratios of KClO4 salt was prepared
using solution cast technique. The complexation of the salt with polymer was
confirmed by Fourier transform infrared (FT-IR) spectroscopy studies.
Electrical conductivity was measured with ac
impedance analyzer in the frequency and temperature range 1 Hz-1 MHz and 303 K-373
K, respectively. It was observed that the magnitude of
conductivity has increased with the increase in the salt concentration as well
as the temperature. The
variation of ac conductivity with
frequency obeys Jonscher power law. The dynamical aspects of electrical
transport process in the polymer electrolyte were analyzed using complex
electric modulus. The modulus spectra reveal the
non-Debye nature of the material.
Page(s): 362-366
Application aspects of polymer electrolytes in solar cells
Title: Application aspects of polymer electrolytes in solar cells
Authors: Suthanthiraraj, S Austin
Abstract: Dye-sensitized solar cells (DSSCs) have aroused intense interest owing
to their easy
fabrication, low cost, simple preparation procedures and high energy conversion
efficiency. Considering the fact that leakage and volatilization of liquid
electrolytes hinder their practical applications in the case of DSSCs, polymer electrolytes
with high ionic conductivity, excellent thermal and long-term stability are
being used as alternatives to liquid electrolytes. This review
focuses mainly on recent progress witnessed in the field of quasi-solid-state
electrolytes suitable for DSSCs. The dependence of photovoltaic performance on
the polymer content within the electrolyte employed in DSSCs, their working
principles as well as latest developments are also discussed.
Page(s): 310-314
Effect of Sr doping on structural, electrical and electrochemical properties of Nd2-xSrxNiO4+δ mixed ionic-electronic conductors
Title: Effect of Sr doping on structural, electrical and electrochemical properties of Nd2-xSrxNiO4+δ mixed ionic-electronic conductors
Authors: Punde, J D; Khandale, A P; Bhoga, S S
Abstract: The Nd2-xSrxNiO4+δ(x = 0.2 and 0.4) solid solutions
prepared by combustion synthesis are of submicron/superfine crystallites size.
The linear variation in dc
conductivity with oxygen partial pressure around Nd1.6Sr0.4NiO4+δ is understood on the basis of
defect chemistry. The electrochemical properties of the cathode material,
studied using electrochemical impedance spectroscopy, reveal area specific
resistance (ASR) = 0.84 ohm cm2 at 973 K. The charge transfer
process in cathode and across cathode-electrolyte interface is the rate
limiting reaction.
Page(s): 376-380
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