• VENKATESWARA RAO MANNEPALLI

      Articles written in Bulletin of Materials Science

    • Tailoring the bandgap and magnetic properties by bismuth substitution in neodymium chromite

      VENKATESWARA RAO MANNEPALLI M M SAJ MOHAN R RANJITH

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      The intrinsic distortions present in rare-earth orthochromites (RCrO$_3$) observed from lanthanum to lutetium (inR-site) can influence the magnetic properties like Neel transition and weak ferromagnetic coupling. A nonmagnetic cationwith similar ionic radius would be a suitable candidate to engineer the inherent distortions of particular orthochromite. In thisstudy, bismuth (Bi$^{3+}$) with a 6s$^2$ lone pair was chosen to substitute in neodymium (Nd$^{3+}$) site of NdCrO$_3$ (NCO) to tailor the intrinsic structural distortions. The variation of optical absorption edge evidently suggests that Bi (6s$^2$) substituted in the magnetic rare-earth Nd$^{3+}$ influences the Cr–O overlap integral. The interaction of Bi cation with oxygen bonds influencesthe structural distortions through Cr–O polyhedral, which are evident from Raman scattering studies. The observed structuraland magnetic properties of similar ionic radius of Bi$^{3+}$ in Nd$^{3+}$ reveal that intrinsic structural distortions are interrelatedto enhanced weak ferromagnetic component and change in Neel and spin reorientation temperatures in our compounds. Inaddition, a reduction in the optical bandgap of NCO from 3.1 to 2.6 eV was observed.

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