Synthesis and characterization of Gd doped La2NiMnO6

Abstract

Multiferroic La2NiMnO6 and the Gd doped (La1-xGdx)2NiMnO6, (x=0, 0.1 & 0.2) samples are prepared by sol - gel technique by using citric acid and ethylene glycol. X-ray diffraction confirms the phase purity of (La1-xGdx)2NiMnO6 (x=0, 0.1 & 0.2) as well as the crystal structure. All the samples are crystallized in monoclinic structure with space group P21/n. The electrical transport measurement is carried out for (La1-xGdx)2NiMnO6, (x=0, 0.1 & 0.2) by two probe method and as a result the enhancement of insulating behaviour with Gd concentration at room temperature is obtained. In addition to this the thermally activated behaviour is observed for all the three samples and the activation energy decreases with the increase in temperature. Temperature dependent dielectric measurement all the samples in the frequency range 100 Hz to 100KHz shows step like decrease in dielectric constant, and loss tangent show corresponding relaxation peak. With increase in Gd – substitution, non-dispersive region of dielectric is shifted to high temperature. The relaxation peak in the loss spectra also shifts to higher temperature with Gd – substitution. Room temperature dielectric loss vs. frequency spectra show with Gd - substitution loss decreases.