Abstract
Gd and La codoped multiferroics with the formula Bi(La,Gd)FeO3(0%≤La≤10%; 0%≤y≤10%) have been synthesised by low temperature sol gel method. XRD analyses confirm the phase formation of all the samples. The decrease in the intensity and shifting of (104) and (110) diffraction peaks of the doped samples towards the higher 2θ region confirms the lattice shifting with the addition of La and Gd but still exhibits perovskite structure. FTIR studies show the presence of the necessary bonds in the samples. Dielectric properties such as dielectric constant, ε' and dielectric loss, tanδ were studied as a function of frequency and compositions of La and Gd. The dispersive behaviour of both ε' and tanδ are explained in accordance to the double mechanism of grain and grain boundaries. However, the actual amount of contributions made by the grains and grain boundaries to the dielectric response and total resistance are not yet discussed. Enhanced dielectric constant and reduced loss factor has been observed with increasing Gd content (decreasing La content). Magnetic measurements of all the samples show an increment in the values of both coercivity (HC) and saturation magnetisation (MS) with the increase in Gd dopant (decrease in La dopant). The modification of the structural, dielectric and magnetic properties of the doped samples was explained on the basis of the size effect of the dopants.
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