Experimental investigation of low dimensional spin system in metal oxides

Abstract

Nano particles of SrCrO4 were manufactured by sol-gel technique. The crystal part ofSrCrO4 is monoclinic having space group P21/n. We calcined it at 950°C temperature. Its cand a lattice parameter are 6.77 and 7.08 which is very close to the reported ones. Ba and Cadoped SrCrO4 were also synthesized by sol-gel method by various concentrations for x= 0.2,0.4, 0.6 and 0.8. Doping samples also sintered at 950°C for 2 hours in order to obtain finepowder. Different characterization techniques such as XRD, Ultra-violet-Spectroscopy, PLSpectroscopy and FTIR Spectroscopy were used to analyze SrCrO4, Ba and Ca-dopedSrCrO4. XRD tells us about the crystal size and dislocation density of samples. The value of2? for the XRD patterns is ranging from 5 to 95. Four peaks are observed in the UV-spectraof SrCrO4 which occur at 350nm, 380nm, 700nm and 750nm. The UV band gap of SrCrO4is 3.25 eV. In PL spectra, two peaks are observed one at 480nm and other at 410nm. At480nm, the energy of emitted photons is 2.5eV, while at 410nm the emitted photons hasenergy of 3ev. In the FTIR analysis, the core modes frequently showed by CrO4 unit aresymmetric stretching bond (?1 (A1)), symmetric bending mode (?2 (E)), asymmetricstretching mode (?3 (F2)) and asymmetric bending mode (?4 (F2)).

Synthesis and Room Temperature Structural, Optical, Electrical Properties of Holmium Doped GdMn2O5 Multiferroics

“…13,39 Moreover the maximum dielectric constant has been observed at low frequency might be due to the bulk consequence of the samples. 40,41 This dispersion with frequency can be explained by Maxwell-Wagner type interfacial polarization which is based on Koop's theory. 42 Here, the doping of Ho in GdMn 2 O 5 didn't show uniform variation in dielectric behavior.…”

The effect of annealing time and gas flow rate on optical and magnetic properties of (Al,Co) co-doped ZnO nanoparticles by varying Al concentration

“…Qaseem et al [4] and Keskenler et al [5] have reported significant effect of particle size and morphology on the optical band gap, magnetic and resistivity behavior. Incorporation of metals (such as Al, Ag, Cu, Fe and Sn) is considered as an effective way in tuning photoelectrical and magnetic properties of the ZnO nanoparticles [6][7][8][9]. Al doping in metal oxide nanoparticles is considered to be one of the potential candidates as a conductive system and transparent metal oxide [10].…”