Koyal Suman

Indian Institute of Technology Indore | IITI · Department of Physics

The sol–gel prepared (1-x)Na0.5Bi0.5TiO3-(x) CaMnO3 (x = 0, 0.03, 0.06, 0.12) compositions show a Rhombohedral (R3c) phase up to x = 0.06 while a mixed rhombohedral (R3c) and orthorhombic (Pnma) phases for the x = 0.12. The lattice volume consistently decreased with an increase in the CaMnO3 content. The phase transition temperature (Tc) decreased...

The sol-gel prepared (1-x) Na0.5Bi0.5TiO3- (x) CaMnO3 (x=0, 0.03, 0.06, 0.12) compositions show a Rhombohedral (R3c) phase for x=0.06 while a mixed Rhombohedral (R3c) and orthorhombic (Pnma) phases for the x=0.12. The lattice volume consistently decreased with an increase in the CaMnO3 content. The phase transition temperature (Tc) decreased with a...

The Rietveld refinement of the polycrystalline powders of 1% Fe and Mn-doped (Na0.5Bi0.5)0.94Ba0.06Ti0.98V0.02O3 at the Ti-site confirmed a single rhombohedral (R3c) phase. The bandgap, (Eg) was affected by the anti-phase octahedral tilt angle and the spin-orbit splitting energy of Ti⁴⁺2p3/2 and Ti⁴⁺2p1/2 states. The decrease in Bi loss and increas...

Polycrystalline Ba0.75Pb0.25Ti1-xFexO3 (0 ≤ x ≤ 0.148) (BPTF) ceramics have been synthesized by sol-gel auto combustion method. The structural, vibrational, electrical, and magnetic properties have been investigated. A detailed structural and vibrational analysis confirms the tetragonal phase in all samples. The proportion of a hexagonal phase incr...

The Rietveld refinement of the polycrystalline powders of 1% Fe and Mn-doped (Na0.5Bi0.5)0.94Ba0.06Ti0.98V0.02O3 at the Ti-site confirmed a single rhombohedral (R3c) phase. The bandgap, (Eg) was affected by the anti-phase octahedral tilt angle and the spin-orbit splitting energy of Ti4+2p3/2 and Ti4+2p1/2 states. The decrease in Bi loss and increas...

The potential of polycrystalline Al doped ZnO nanoparticles as an active material for UV photodetectors has been investigated. The Rietveld refinement of powder X-ray diffraction data revealed a single hexagonal phase of the nanoparticles. A slight deviation in the lattice cell constants from pristine ZnO was observed, associated with defect creati...

The structural, electrical, ferroelectric, and piezoelectric properties of Zr substituted Ba0.75Pb0.25Ti1-xZrxO3 perovskite series were investigated. The structural phase refinement of x-ray diffraction data revealed the coexistence of tetragonal and orthorhombic phases in the substituted samples. Raman studies also supported the mixed phases for t...

Structural, optical, and electrical properties of rhombohedral (R3c) Fe-doped Na0.47Bi0.47Ba0.06Ti0.98-xV0.02FexO3 (x = 0, 0.005 and 0.01) are reported. The bond-lengths and bond angles were studied and were correlated with the vibrational, optical, and electrical properties of the materials. Oxygen displacement, Ti off-centering and tilting of oct...

We present faceted and non-faceted crystal cupric oxide (CuO) nanoribbons synthesized by different processes for the glucose-sensing application. The faceted and non‐faceted CuO nanoribbons are grown via a hydrothermal and a microwave heating processes, respectively. Their growth mechanisms are considered as the surface energy kinetics supported by...

This study reports a facile hydrothermal synthesis of Copper tungsten oxide (CuWO 4) and CuWO 4-reduced graphene oxide hybrid nanoparticles and its application as an electrode for supercapacitor application. The morphology and composition has been characterized using X-Ray Diffraction (XRD), Field Emission Scanning Electron Microscopy (FESEM) and E...