Showing papers by "Sampat Raj Vadera published in 2003"
TL;DR: In this paper, a novel wet-chemical precipitation method is optimized for the synthesis of ZnS nanocrystals doped with Cu+ and halogen, and the nanoparticles were stabilized by capping with polyvinyl pyrrolidone (PVP).
219 citations
TL;DR: In this paper, the effect of heat treatment on Ni-Zn ferrite nanoparticles in aniline formaldehyde copolymer using a room temperature route was studied using XRD, FTIR spectrograms, Fe Mossbauer spectroscopy and TEM microscopy.
40 citations
TL;DR: In this paper, the Mossbauer spectra of Sn4+/Nb5+ substituted Mn-Zn ferrites have been taken to understand the site occupancy of substituted ions.
Abstract: At room temperature, Mossbauer spectra of Sn4+/Nb5+ substituted Mn- Zn ferrites have been taken to understand the site occupancy of substituted ions. The results indicate that both the substituted ions occupy tetrahedral (A) site only at lower concentration of substitution while at higher concentration they occupy both tetrahedral and octahedral sites. At higher concentration of Nb substitution a doublet has been observed besides sextets. The possibility of canting existence on octahedral sites has been discussed. The observed variations of the hyperfine fields, isomer shift, line widths and B/A peak area ratio with the ferrite composition are interpreted.
11 citations