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Rajagopal, E.
- Elastic Behavior and Internal Friction Loss of NiMgCuZn Ferrospinels for Microinductor Applications
Abstract Views :152 |
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Authors
N. Varalaxmi
1,
M. Venkata Ramana
1,
N. Ramamanohar Reddy
1,
K. V. Sivakumar
1,
E. Rajagopal
1,
V. R. K. Murthy
2
Affiliations
1 Ceramic Composite Materials Laboratory, Department of Physics, Sri Krishnadevaraya University, Ananthapur - 505 003, IN
2 Department of Physics, Indian Institute of Technology, Chennai - 600 036, IN
1 Ceramic Composite Materials Laboratory, Department of Physics, Sri Krishnadevaraya University, Ananthapur - 505 003, IN
2 Department of Physics, Indian Institute of Technology, Chennai - 600 036, IN
Source
Journal of Pure and Applied Ultrasonics, Vol 29, No 4 (2007), Pagination: 133-138Abstract
Two series of NiMgCuZn ferrites namely 1) NixMg0.6xZn0.3Fe2O4 with x=0.0,0.1,0.2,0.3; 2)Ni0.35Mg0.2yCu0.05Zn0.5-yFe2O4 with y=0.0,0.1,0.2 were prepared by conventional double sintering process with a view to examine their use as core materials for microinductor applications. The x-ray analysis revealed the single phase formation. In order to examine their elastic behaviour, the temperature variation of longitudinal modulus and acoustic loss (Q-1) of these samples at 142 kHz were studied in temperature range 300 to 630 K using composite resonator technique. The longitudinal modulus showed an abrupt break near curie temperature transition in all the samples studied in the present work. The temperature variation of internal friction loss (Q-1) showed a corresponding stress induced relaxation peak at this phase transition. The results are explained in the light of structural phase transition.- Ultrasonic Behaviour of Dilute Solutions of Water in Amines
Abstract Views :126 |
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Authors
Affiliations
1 Sree Lakshmi Sreenivasa Degree College, Pullareddy Peta, Kadapa-516175, IN
2 Department of Physics, Sri Krishnadevaraya University, Anantapur-515003, IN
1 Sree Lakshmi Sreenivasa Degree College, Pullareddy Peta, Kadapa-516175, IN
2 Department of Physics, Sri Krishnadevaraya University, Anantapur-515003, IN
Source
Journal of Pure and Applied Ultrasonics, Vol 27, No 2-3 (2005), Pagination: 98-102Abstract
Ultrasonic velocities (u) in dilute solutions of water in diethylamine, triethylamine, dibutylamine and di-sec-butylamine have been determined at 298.15 K using single crystal variable path interferometer working at 3 MHz. Excess ultrasonic velocities (uE) have been evaluated using thermodynamically valid expression. A distinctive non-linear variations of ultrasonic velocity and excess ultrasonic velocity with concentration (X2) of water in all the (amine+water) systems have been observed. The linear variation of u and uE upto certain optimum concentration (X2)opt, observed has been explained as due to the existence of water molecules as monomers distributed uniformly throughout the solutions. The non-linear variations of u and uE versus X2 beyond (X2)opt has been explained in the light of water-water and water-amine interactions leading to the formation of water-amine complexes.- Excess Thermodynamic Fluctuation Parameters of Binary Mixtures of Acetonitrile, Benzene and Dimethyl-Formamide at 298.15 K
Abstract Views :208 |
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Authors
Affiliations
1 Department of Physics, University of Botswana, Gaborone, BW
2 Department of Physics, Sri Krishnadevaraya University, Anantapur-515003, IN
1 Department of Physics, University of Botswana, Gaborone, BW
2 Department of Physics, Sri Krishnadevaraya University, Anantapur-515003, IN