Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10155525 | Journal of Non-Crystalline Solids | 2018 | 12 Pages |
Abstract
The Pb1-xNixTiO3 (xâ¯=â¯0.0, 0.2, 0.4, 0.5, 0.6, 0.8 and 1.0) nanoparticles are synthesized by sol-gel method and microwave sintering technique. Samples calcinated at 730â¯Â°C exhibit pseudo-cubic crystal structure, further sintering at 1000â¯Â°C the samples exhibited tetragonal structure except xâ¯=â¯0.8. The crystallite size is found to be 47-39â¯nm. Fourier Transfer-Infra Red studies confirm the PbTiO, TiO and NiO bond formation of prepared samples. The optical excitation spectrum reveals that the samples have direct allowed energy bandgap values of 2.81 to 2.82â¯eV. Synthesized samples particle size found to be 1â¯Î¼m to 31â¯nm from High-Resolution Scanning Electron Microscope analysis. The particle size is found to be decreasing on increasing the nickel concentration. X-ray powder diffraction and electron microscope profiles confirmed single phase behaviour of the compounds in lower concentration of nickel. The prepared compounds show nearly spherical shape morphology with an average particle size of 1â¯Î¼m to 31â¯nm which is close to crystallite size determined from the XRPD. The temperature dependent dielectric constant (ε) measurement show low values at room temperature and were nominally changes with increasing temperature upto 350â¯K. The ac electrical study of synthesized samples confirms the negative temperature coefficient of resistance and thermally activated charge carriers are responsible for the high-temperature behaviour. At room temperature prepared samples exhibited superparamagnetic nature. The saturation magnetization (Ms) and coercivity values are found to be 0.08-15.9â¯emu/g and 236-195â¯Oe at 15â¯kG field strength.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
C. Pavithra, W. Madhuri,