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.

EPR and Ionic Thermocurrents Experiments on Cubic Solid Solutions Sr1-xEuxF2+x

Abstract: In this paper we report about the results of EPR and ionic thermocurrents (ITC) experiments on cubic solid solutions of the type Sr 1- x Eu x F 2+ x . A part of the Eu-ions is in the divalent state; these ions can be detected easily with EPR. From the EPR results we conclude that for 0≦ x ≦0.115 the long range order is still cubic and the lattice parameter does not vary appreciably. The interactions between distant Eu 3+ -F - i dipoles and the Eu 2+ probes is estimated; from this we conclude that for \(x{\gtrsim}0.044\) clustering of trivalent Eu-ions cannot be excluded. The ITC results are in line with those obtained from EPR. In addition we note that for small values of x nearest neighbor (NN) Eu 3+ -F - i complexes are the dominant defects. For x >5.10 -3 NNN dipoles are present also. Apart from the reorientation bands associated with the above mentioned defects we observe with ITC a depolarization peak, ascribed to space charge phenomena. The behavior of the dipole peaks and the space charge peak is d...

Radiation characteristics of microstrip rectangular patch antenna fabricated on LiTiMg ferrite substrate

Abstract: A microstrip rectangular patch antenna fabricated on LiTiMg ferrite substrate is presented which has also been compared with same structure of antenna on dielectric (RT duroid) substrate for the X band (10 GHz). The structure of antenna has been optimized with IE3D and lithographed on 2 mm thickness ferrite substrate. The radiation patterns are measured in anechoic chamber and plotted for both E-plane and H-plane. Using ferrite material the patch size reduced to 37% compare to antenna printed on dielectric substrate. If we can compare the values of return loss radiation power, gain, quality factor and VSWR for antenna on ferrite substrate which is better than the antenna on dielectric substrate but the bandwidth and directivity of antenna was much affected negatively. For this work we have synthesized the polycrystalline LiTiMg ferrite by the solid state reaction technique (SSRT) and characterized their electric and magnetic properties.