Abstract
Polycrystalline ceramic samples of Mn substituted Yttrium ortho-ferrite have been synthesized using the conventional high temperature solid-state reaction method. X-ray diffraction analysis confirmed the formation of the polycrystalline compound. Rietveld analysis of X-ray diffraction patterns revealed the monophasic orthorhombic structure with space group Pnma. Average crystallite size has been calculated which is showing the decreasing trend with increase of Mn content. The three-dimensional crystal structures have been generated using the Vesta software and different structural parameters have been calculated using these structures. The dielectric measurement as a function of frequency and temperature indicates that the relative permittivity and loss factors are increasing with the increase in substitution concentration. Similarly, the impedance has been measured as a function of frequency and temperature which reflects overall decreasing trend. In all cases the AC conductivity is showing the increasing trend with temperature. Further, the DC conductivity has also been measured and the material constant (B) has been calculated which reflect the NTCR (negative temperature coefficient of resistance) effect for these materials. The I–V characteristic curves recorded at 573 K and 673 K show the enhancement in current and linearity with temperature as well as with substitution concentration.
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