Subhash Chander
Articles written in Pramana – Journal of Physics
Volume 21 Issue 5 November 1983 pp 323-328 Nuclear And Particle Physics
Study of1840Ar ion tracks in cellulose nitrate
Subhash Chander Shyam Kumar J S Yadav A P Sharma
Sample of cellulose nitrate (Russian) is exposed to1840Ar ions. The bulk etch rate has been studied at different etching temperatures and the activation energy for bulk etch rate has been calculated. The etched track lengths are measured for different etching times. The energy loss rate and range of1840Ar ions in CN(R) is also calculated. The critical threshold value for etchable track in CN(R) is determined by comparing the theoretical and experimental values of track length. The response curve of CN(R) is also presented.
Volume 61 Issue 3 September 2003 pp 617-624
Magnetic behaviour of nano-particles of Fe2.9Zn0.1O4
Subhash Chander Sudhish Kumar Anjali Krishnamurthy Bipin K Srivastava V K Aswal
DC magnetization measurements are reported in the temperature range 20–100 K on a poly-disperse nano-particle sample of the spinel ferrite Fe2.9Zn0.1O4 with a log-normal size distribution of median diameter 43.6 Å and standard deviation 0.58. Outside a core of ordered spins, moments in surface layer are disordered. Results also show some similarities with conventional spin glasses. Blocking temperature exhibits a near linear variation with two-third power of the applied magnetic field and magnetization
Volume 63 Issue 2 August 2004 pp 345-350
Magnetic behaviour of nano-particles of Fe2.8Zn0.2O4
Subhash Chander Seema Lakhanpal Anjali Krishnamurthy Bipin K Srivastava V K Aswal
Magnetization measurements are reported on a nano-particle sample of Znsubstituted spinel ferrite Fe2.8Zn0.2O4 in the temperature range 20–300 K. Analysis of small-angle neutron scattering data shows the sample to have a log-normal particle size distribution of median diameter 64.4 Å and standard deviation 0.38. Magnetization evolves over a long period of time
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