Department of Physics: Recent submissions
Now showing items 81-100 of 212
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Dielectric and phase transition of BaTi 0.6Zr 0.4O 3 ceramics prepared by a soft chemical route
(SPRINGER, 2008-04-01)BaTi0.6Zr0.4O3 (BTZ) ceramic was synthesized by a soft chemical route. X-ray diffraction at room temperature shows that the sample has cubic perovskite structure with space group Pm-3m. Temperature dependent dielectric ... -
Observation of second metastable state in superheated emulsion detector
(ELSEVIER SCIENCE BV, 2008-08-11)The superheated emulsion detector (SED), a well-known detector for neutrons, ions, electrons and photons. contains droplets of superheated liquid held in a viscoelastic gel. It is well known that these droplets are in a ... -
An active device for volumetric measurement of drop nucleation in a superheated emulsion detector
(IOP PUBLISHING LTD, 2008-10-01)An active volumetric device for active detection and measurement of drop nucleation of superheated emulsions is described. The drop nucleation is detected by an optical arrangement using a pair of a laser and a light-dependent ... -
Using the no-signaling condition for constraining the nonidealness of a Stern-Gerlach set-up
(IOP PUBLISHING LTD, 2009-02-27)On the basis of a variant of the EPR-Bohm example, we show that the no-signaling condition can be employed as a useful tool for deriving a constraint on a suitably defined measure of the 'nonidealness' of a Stern-Gerlach ... -
J. C. BOSE’S DOUBLE-PRISM EXPERIMENT USING SINGLE PHOTON STATES VIS-A-VIS WAVE-PARTICLE DUALITY
(Indian Science News Association, 2008-11-01)We discuss in this article the significance of the double-prism experiment J. C. Bose had performed in 1897 in order to verify the wave-like nature of electromagnetic radiation, using the phenomenon of optical tunneling ... -
Quantitative probing of the quantum-classical transition for the arrival time distribution
(IOP PUBLISHING LTD, 2009-04-24)The classical limit problem of quantum mechanics is revisited on the basis of a scheme that enables a quantitative study of the way the quantum-classical agreement emerges while going through the intermediate mass range ... -
On the Nature of Matter – 2500 Years of debate
(Indian Science News Association, 2008-07-01)The ancient Greeks left an extensive record of discussion regarding the nature of matter, and the debate has continued ever since. The ideas of atoms and forces were not especially popular, and they were only fairly recently ... -
ASCENT OF SAP
(Indian Science News Association, 2008-11-01)The enigmatic rise of water (sap) through the xylem of various plants has been a topic of active research and controversy for several decades. Various models like the vital theory models (viz. the pulsatile pumping model ... -
Charge response of polyethylene terephthalate polymers (PET) to light and heavy nuclei
(PERGAMON-ELSEVIER SCIENCE LTD, 2008-08-01)A particular brand of common polymer film has been found to have a high detection threshold value of Z / β, when used as a solid state nuclear track detector to detect energetic ion beams. From the infra-red absorption ... -
Polyethylene terephthalate polymers at mountain altitude as cosmic ray heavy particle detector
(PERGAMON-ELSEVIER SCIENCE LTD, 2008-08-01)We exposed a stack of polyethylene terephthalate (PET) detectors each of thickness I 100 mu m with an area of 21 cm x 30cm along with a separate stack of the standard solid state nuclear track detector (SSNTD) CR-39 ... -
Electrical properties of 0.90Pb[(Mg,Zn) 1/3Ta 2/3] O 3-0.10PbTiO 3 relaxor
(OFICYNA WYDAWNICZA POLITECHNIKI WROCLAWSKIEJ, 2008)Polycrystalline 0.90Pb[(Mg2/3Zn1/3)(1/3)Ta-2/3]O-3-0.10PbTiO(3) having a tetragonal perovskite type structure was prepared by the high temperature solid-state reaction method. Dielectric studies showed the relaxor behaviour ... -
Electrical properties of relaxor ferroelectric PMCT-PT-ZnO ceramic
(NATL INST SCIENCE COMMUNICATION, 2008-04-01)Polycrystalline samples of 0.85Pb[(Mg2/3Cd1/3)(1/3)Ta-2/3]O-3-0.15PbTiO(3) with 7.5% of ZnO having a tetragonal perovskite type structure have been prepared using high temperature solid-state reaction method. Dielectric ... -
Electronic transport, density of states and ground state properties of Li- In binary alloy
(ELSEVIER SCIENCE BV, 2008-10-01)The electronic transport properties of Li-In binary alloy have been studied by Harrison's first principle pseudopotential technique. The Percus-Yevik hard sphere model is used to compute the partial structure factors Sij/(k) ... -
Dielectric relaxation and electronic structure of BaAl 1/2Nb 1/2O 3: X-ray photoemission and nuclear magnetic resonance studies
(IOP PUBLISHING LTD, 2008-11-05)The frequency-dependent dielectric relaxation in barium-aluminium-niobate, BaAl1/2Nb1/2O3 ( BAN), at low temperatures (103-443 K) is investigated by alternating-current impedance spectroscopy in the framework of conductivity ... -
Dielectric relaxation and electronic structure of double perovskite Sr 2 FeSbO6
(AMER INST PHYSICS, 2008-09-15)The dielectric property and the electronic structure of a double perovskite, Sr2FeSbO6 (SFS) synthesized by solid state reaction technique are investigated. The x-ray diffraction of the sample taken at room temperature ... -
Dielectric relaxation in Sr(Mg1/3Nb2/3)O-3
(ELSEVIER SCIENCE BV, 2008-10-01)The frequency-dependent dielectric dispersion of strontium-magnesium-niobate (SMN), Sr(Mg1/3Nb2/3)O-3 ceramic synthesized by the solid state reaction technique is investigated in the temperature range from 303 to 613 K The ... -
Dielectric relaxation and ac conductivity study in SrMg 1/3Nb2/3O3
(NATL INST SCIENCE COMMUNICATION, 2008-04-01)The frequency-dependent dielectric dispersion of strontium-magnesium- niobate, SrMg1/3Nb2ZiO3 ceramic synthesized by the solid state reaction technique is investigated in the temperature range from room temperature to 613 ... -
Impedance spectroscopy, electronic structure and X-ray photoelectron spectroscopy studies of Pb(Fe1/2Nb1/2)O3
(ELSEVIER SCIENCE BV, 2009-02-01)Impedance spectroscopy is used to study the electrical behaviour of lead iron niobate, Pb(Fe1/2Nb1/2)O3 (PFN) in the frequency range from 100 Hz to 1 MHz and in the temperature range from 203 to 363 K. The frequency-dependent ... -
Relaxor behaviour of (Ba0⋅5Sr0⋅5)(Ti0⋅6Zr0⋅4)O3 ceramics
(Indian Academy of Sciences, 2008-11-01)Ba0⋅5Sr0⋅5Ti0⋅6Zr0⋅4O3 ceramic has been prepared through solid state reaction route. X-ray diffraction shows that the sample has cubic perovskite structure with space group Pm–3m at room temperature. Temperature dependent ... -
Ferroelectric phase transition of Ba1-xSrxTi0.6Zr0.4O3 ceramics
(TAYLOR & FRANCIS LTD, 2008)Perovskite type Ba(1-x)Sr(x)Ti(0.6)Zr(0.4)O(3) (with x = 0.0, 0.1, 0.2, 0.4 and 0.5) ceramics have been synthesized through solid oxide reaction route. The room temperature XRD study suggests the compositions have single ...