Anjali
Articles written in Pramana – Journal of Physics
Volume 16 Issue 1 January 1981 pp 39-47 Solid State Physics
Lattice sum calculations and a Mössbauer study on electric field gradient in phlogopite
Anjali Krishnamurthy Bipin K Srivastava S Lokanathan
Lattice sum contributions have been calculated at the two octahedral sites in a phlogopite mica assuming a systematic distribution of octahedral cationic charges. This, unlike the case of a random distribution of charges, is able to reproduce broad features of quadrupole doublet spectra in Mössbauer experiments suggesting that the doublet assignments in terms of the two structural sites,
Volume 38 Issue 2 February 1992 pp 171-177 Research Articles
On preparation of fine particles of MnFe2O4 and their magnetic properties
S N Dolia Anjali Krishnamurthy Bipin K Srivastava Vipasha Ghose
Influence of the heat treatment, following a wet chemical process, has been examined on the sizes of the obtained particles of MnFe2O4. X-ray diffraction, magnetization and Mössbauer measurements have been used. The average sizes of the obtained particles are in the range of ∼ 100 Å–300Å with the upper size limit being ∼ 450 Å and more. The average size as well as size distribution is strongly influenced by the nature of the heat treatment followed for preparation of the sample. Prolonged hydrothermal heating resulted in larger average size than did dry heating at 400°C of the precipitate obtained from the initial wet process. Further dry heating following hydrothermal treatment did not lead to any major growth. Chemical nature of the starting materials also affects the sizes.
Volume 52 Issue 1 January 1999 pp 111-120
Magnetic structure of (Fe0.97Cr0.03)2P
Sudhish Kumar S K Paranjpe Bipin K Srivastava Anjali Krishnamurthy V C Sahni
Magnetic behaviour of di-metal iron phosphide with a small substitution of iron by chromium, (Fe0.97Cr0.03)2P, has been studied using SQUID magnetometry and powder neutron diffraction. It is paramagnetic at temperatures above ∼180 K with persisting short range ferromagnetic (FM) order. At lower temperatures three different regions of magnetic behaviour are identified. FM order evolves in the region 180 K-120 K but much more slowly and with much less magnetic moments than in Fe2P. In the region 120 K-50 K negative exchange interactions gain some importance leading to a loss of FM order. Below 50 K FM interactions again dominate. Pinning centres influence the behaviour at low temperature up to ∼100 K.
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 199-205
Magnetization and neutron diffraction studies on FeCrP
Sudhish Kumar Anjali Krishnamurthy Bipin K Srivastava A Das S K Paranjpe
Crystal structure and magnetic behaviour of FeCrP have been investigated using magnetization and neutron diffraction measurements. FeCrP crystallizes in orthorhombic FeZrP type structure (Pnma space group,
Volume 63 Issue 2 August 2004 pp 207-212
Magnetic behaviour of (Fe0.85Cr0.15)2As
S K Jain A Das Bipin K Srivastava Anjali Krishnamurthy S K Paranjpe
Magnetization and neutron diffraction measurements have been made on the title pseudo-binary of tetragonal anti-ferromagnets Fe2 As and Cr2 As. In this system antiferromagnetic (AFM) ordering appears below 310 K. The moments are confined in the
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
Volume 63 Issue 3 September 2004 pp 481-490
Bianchi type-I bulk viscous fluid string dust magnetized cosmological model in general relativity
Bianchi Type-I magnetized bulk viscous fluid string dust cosmological model is investigated. To get a determinate model, we have assumed the conditions σ ∝
Volume 89 Issue 1 July 2017 Article ID 0008 Special Issue
A fragment-based approach towards $\it{ab-initio}$ treatment of polymeric materials
RESHMA S PINGALE SUBHASH S PINGALE ANJALI KSHIRSAGAR
The broad range of applications of $\pi$-conjugated polymeric materials in industries such as automobiles, textiles, packaging, medical etc. have led to their extensive studies in both academic and industrial fields. Predicting the structure of these polymers is important for the study of their properties. The present work uses a ‘divide and conquer’-type approach for the $\it{ab-initio}$ studies of these polymeric systems. The method employs a fragmentation technique with independent fragment optimization for obtaining optimized geometries of the oligomers of various polymeric materials such as polyfuran, polypyrrole, polythiophene and other such $\pi$-conjugated polymers. A few test calculations performed in the study provide fair concurrence between the energies and the HOMO–LUMO energy gaps obtained using the fragmentation-based approach with those obtained using the full optimization of the whole oligomer. Also, a significant reduction in time complexity occurs for the present fragment-based approach compared to the parent system optimization. The results are encouraging and prompt for studies of large polymeric materials.
Volume 96 All articles Published: 13 January 2022 Article ID 0021 Research Article
K P ANJALI K PRATHAPAN R K BIJU
The radioactive decay probabilities of various proton halo (p-halo) nuclei from parent isotopes in the superheavy (SH) region,
Volume 96, 2022
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