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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Nagabhushana, H. Nagabhushana, B. M. Premkumar, H. B. Daruka Prasad, B. Rao, J. L. Sharma, S. C. Chakradhar, R. P. S. |
| Description | Country affiliation: India Author Affiliation: Premkumar HB ( Department of Physics, Acharya Institute of Technology, Bangalore 560090, India.); Nagabhushana H ( Prof. C.N.R. Rao Centre for Advanced Materials, Tumkur University, Tumkur 572103, India. Electronic address: bhushanvlc@gmail.com.); Sharma SC ( Vice Chancellor, Chhattisgarh Swamy Vivekananda Technical University, North Park Avenue, Sector - 8, Bhilai, Chhattisgarh 490 009, India.); Daruka Prasad B ( Department of Physics, B.M.S. Institute of Technology, Bangalore 560064, India.); Nagabhushana BM ( Department of Chemistry, M.S. Ramaiah Institute of Technology, Bangalore 560054, India.); Rao JL ( Department of Physics, S.V. University, Tirupathi 517502, India.); Chakradhar RP ( CSIR-National Aerospace Laboratories (CSIR), Bangalore 560017, India.) |
| Abstract | A simple and inexpensive combustion method was used to prepare Fe(3+) doped YAlO3 perovskite within few minutes at low temperature (400±10°C). This might be useful in lowering the cost of the material. The final products were well characterized by various spectroscopic techniques such as PXRD, SEM, TEM, FTIR and UV-Visible. The average crystallite size was estimated from the broadening of the PXRD peaks and found to be in the range 45-90nm, the results were in good agreement with the W-H plots and TEM. The crystallites show dumbbell shape, agglomerated particles with different size. The TL glow curves of 1-5kGy γ-irradiated YAlO3:Fe(3+) (0.1mol%) nanopowder warmed at a heating rate of 3°Cs(-1) records a single glow peak at â ¼260°C. The kinetic parameters namely activation energy (E), order of kinetics (b) and frequency factor (s) were determined at different gamma doses using the Chens glow peak shape method and the results were discussed in detail. The photoluminescence spectra for Fe(3+) (0.1-0.9mol%) doped YAlO3 records the lower energy band at 720nm ((4)T1 (4G)â (6)A1 (6S)) and the intermediate band located at 620nm ((4)T2 ((4)G)â (6)A1 (6S)) with the excitation of 378nm. The higher energy band located at 514nm was associated to (4)E+(4)A1 ((4)G)â (6)A1 (6S) transition. The resonance signals at g values 7.6, 4.97, 4.10, 2.94, 2.33 and 1.98 were observed in EPR spectra of Fe(3+) (0.1-0.9mol%) doped YAlO3 recorded at room temperature. The g values indicate that the iron ions were in trivalent state and distorted octahedral site symmetry was observed. |
| ISSN | 13861425 |
| Volume Number | 126 |
| e-ISSN | 18733557 |
| Journal | Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy |
| Language | English |
| Publisher | Elsevier |
| Publisher Date | 2014-05-21 |
| Publisher Place | Great Britain (UK) |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Aluminum Compounds Chemistry Iron Luminescent Agents Yttrium Chemical Synthesis Calcium Compounds Cations Electron Spin Resonance Spectroscopy Luminescence Luminescent Measurements Nanoparticles Ultrastructure Oxides Powders Spectrophotometry, Ultraviolet Spectroscopy, Fourier Transform Infrared Titanium X-ray Diffraction Journal Article Discipline Spectroscopy |
| Content Type | Text |
| Resource Type | Article |
| Subject | Spectroscopy Atomic and Molecular Physics, and Optics Analytical Chemistry Instrumentation |
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