K. Samuvel; K. Ramachandran; V. Ratchagar; G. Ravi
Abstract
Barium Titanate doped with Cobalt is known for both its electric and magnetic properties. The synthesis and characterization of Cobalt doped barium titanate; BaTi1-xCoxO3(BTCO) x = 0.5was investigated with a view to understand its structural, magnetic and electrical properties. A finest possible sample ...
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Barium Titanate doped with Cobalt is known for both its electric and magnetic properties. The synthesis and characterization of Cobalt doped barium titanate; BaTi1-xCoxO3(BTCO) x = 0.5was investigated with a view to understand its structural, magnetic and electrical properties. A finest possible sample of Co doped micro particles of BaTiO3 (BTO) with possible tetragonal structure via a solid-state route was prepared. Prepared samples of BaTi1-xCoxO3 (BTCO) were structural characterized by X-ray diffraction (XRD). The dielectric constant measurements of the samples were carried out at 1Hz to1 MHz Vibrating Sample Magnetometer (VSM) measurements revealed the magnetic nature of Cobalt doped BaTiO3. Ferroelectric hysteresis loop traced at the electric field in-between -15 to +15 (KV/cm). The relaxation phenomena that take place cane be attributable to the damping of dipole oscillator due to the application of external field. The impedance measurements were done up to 473 K in order to separate grain (bulk) and grain boundary contributions. The FESEM micrographs show proper grain growth and EDAX confirmed the presence of all the elements in samples. In the present study, various electrical properties of barium titanate based ceramics were explained and examples of the relevant applications were given. Copyright © 2017 VBRI Press.
P. Prabeesh; P. Saritha; I Packia Selvam; S. N. Potty
Abstract
Kesterite thin films have been fabricated by chemical spray pyrolysis technique using less toxic organic solvent followed by annealing at different temperatures in inert nitrogen atmosphere. Phase formation and structural evolution were studied by XRD and Raman spectroscopy. The films annealed at 450°C ...
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Kesterite thin films have been fabricated by chemical spray pyrolysis technique using less toxic organic solvent followed by annealing at different temperatures in inert nitrogen atmosphere. Phase formation and structural evolution were studied by XRD and Raman spectroscopy. The films annealed at 450°C and 500°C exhibited excellent properties required for photovoltaic absorber materials. UV-Vis spectroscopy was used to estimate absorption coefficient and band gap; the films annealed at 450°C and 500°C showed band gap of 1.65eV and 1.51eV, respectively. Surface morphological properties and film thickness were studied by FESEM and electrical properties by Hall measurement system. Films annealed at 500°C showed densely packed grains with thickness ~ 1.2μm. Electrical properties of the films annealed in nitrogen atmosphere were in good agreement with the values previously reported for CZTS thin films. Copyright © 2017 VBRI Press
