Synthesis, characterization, EPR and thermoluminescence properties of CaTiO3 nanophosphor

Shivaram, M and Krishna, Hari R and Nagabhushana, H and Sharma, SC and Nagabhushana, BM and Ravikumar, BS and Dhananjaya, N and Shivakumara, C and Rao, JL and Chakradhar, RPS (2013) Synthesis, characterization, EPR and thermoluminescence properties of CaTiO3 nanophosphor. In: Materials Research Bulletin, 48 (4). pp. 1490-1498.

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Abstract

Calcium titanate (CaTiO3) nanophosphors were synthesized by three different routes namely solution combustion (SC), modified solid-state reaction (MSS) and solid-state (SS) methods. Rietveld refinement studies revealed the presence of an orthorhombic structure with traces of CaCO3. The crystallite sizes were found to be in the 43-45 nm range. TEM studies also confirm the nano size with well crystalline nature. EPR spectrum for SS method exhibits a broad resonance signal at g = 2.027 is attributed to TiO6](9-) center, whereas in MSS sample the resonance signals are attributed to surface electron and hole trapping sites. The TL behavior has been investigated for the first time using gamma-irradiation. TL glow peak at 169 degrees C were recorded in CaTiO3 prepared by SC, MSS and SS methods. The trapping parameters such as activation energy (E) and order of kinetics (b) were estimated using peak shape method and results are discussed in detail. (C) 2013 Elsevier Ltd. All rights reserved.

Item Type:	Journal Article
Publication:	Materials Research Bulletin
Publisher:	Elsevier Science
Additional Information:	Copyright of this article belongs to Elsevier Science.
Keywords:	Oxides; Chemical Synthesis; X-ray Diffraction; Electronic Paramagnetic Resonance; Luminescence
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	28 May 2013 06:53
Last Modified:	28 May 2013 06:53
URI:	http://eprints.iisc.ac.in/id/eprint/46579

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