Solid State Physics Laboratory

About: Solid State Physics Laboratory is a facility organization based out in Delhi, India. It is known for research contribution in the topics: Quantum dot & Dielectric. The organization has 1754 authors who have published 2597 publications receiving 50601 citations.

Hierarchical 3D NiCo 2 O 4 nanoflowers as electrode materials for high performance supercapacitors

Abstract: Three-dimensional NiCo2O4 nanoflowers have been directly grown on a stainless steel substrate surface, using a facile chemical bath deposition (CBD) technique. The deposited thin films were characterized for their structural, morphological and electrochemical properties by using XRD, SEM, cyclic voltammetry and charge discharge methods. The 3D NiCo2O4 nanoflowers were used as working electrode to measure the supercapacitor performance. The 3D NiCo2O4 nanoflowers exhibit high specific capacitance of 543 Fg−1 at current density 1 Ag−1. The capacitance loss was 9.4 % after 1000 cycles at a current density of 3 Ag−1. This shows a good cycle stability and high rate capability of 3D NiCo2O4 nanoflowers. From this investigation it can be concluded that the low cost and environmental friendly CBD technique could be used to deposit efficient 3D NiCo2O4 nanoflowers for supercapacitor application.

Microcantilever-based Sensors

Abstract: Micromachined cantilever platform offers an opportunity for the development and mass production of extremely sensitive low-cost sensors for real time in situ sensing of many chemical, explosives and biological species. These sensors have been used for measuring and detecting various hazardous chemicals, explosives, and biological agents, leading to the development of hand-held labs. In this paper, different geometries of microcantilevers have been analysed, and their performances in terms of deflection and shift in resonance frequency due to additional mass of analyte have been simulated. The results of these studies can be used to increase the sensitivity of these devices. Defence Science Journal, 2009, 59(6), pp.634-641 , DOI:http://dx.doi.org/10.14429/dsj.59.1569

Mossbauer study of atomic order in ni3fe .1. determination of long-range-order parameter

Abstract: By means of M\"ossbauer spectroscopy we studied the structural order in a series of stoichiometric ${\mathrm{Ni}}_{3}$Fe foils, which had been given different heat treatments. The long-range-order parameter $\ensuremath{\eta}$ was determined with an accuracy of \ifmmode\pm\else\textpm\fi{}0.02 by analyzing the profiles of the outer lines of $^{57}\mathrm{Fe}$ absorption spectra, recorded at room temperature. From the analysis it appeared that the hyperfine field at $^{57}\mathrm{Fe}$ nuclei depends linearly on the numbers of iron atoms in the first and second neighboring shell, and that contributions from more distant atoms are negligible. Further anisotropic hyperfine interactions in ${\mathrm{Ni}}_{3}$Fe are small. A comparison with $\ensuremath{\eta}$ as determined from x-ray diffraction indicates that the wrongly placed atoms in partly ordered ${\mathrm{Ni}}_{3}$Fe are distributed at random over the lattice sites.

Electrical conductivity of NiZn ferrites doped with Ti4+ ions

Abstract: The d.c. resistivity ρ of the polycrystalline solid solutions Zn0.25Ni0.75 + t−TitFe2−2tO4 was measured as a function of titanium content and temperature. The electrical conduction in these ferrites is explained on the basis of the hopping mechanism. The composition dependence of the resistivity is explained in terms of the cation distribution. The activation energy of each sample is calculated from the plots of log ρ versus 10 3 T which are almost linear.