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Please use this identifier to cite or link to this item: http://hdl.handle.net/10204/5804

Title: Electron spin resonance study of a-Cr2O3 and Cr2O3·nH2O quasi-spherical nanoparticles
Authors: Khamlich, S
Srinivasu, VV
Nemraoui, O
McCrindle, R
Cingo, N
Maaza, M
Keywords: Chromium(III) Oxide
Electron Spin Resonance
Temperature dependence
Thermal relaxation time
Issue Date: Dec-2011
Publisher: American Scientific Publishers
Citation: Khamlich, S, Srinivasu, VV, Nemraoui, O, McCrindle, R, Cingo, N and Maaza, M. 2011. Electron spin resonance study of a-Cr2O3 and Cr2O3·nH2O quasi-spherical nanoparticles. Nanoscience and Nanotechnology Letters, vol. 3(4), pp 550-555
Series/Report no.: Workflow;8783
Abstract: The quasi-spherical nanoparticles of hydrated Cr2O3 · nH2O, and crystalline -Cr2O3, have been synthesized by reduction of the first row (3d) transition metal complex of K2Cr2O7. The temperaturedependence of electron spin resonance (ESR) spectrum was studied in terms of g-factor, line width and intensity. ESR of both Cr2O3 · nH2O and -Cr2O3 has been studied at X-band (9.61 GHz) in the temperature range of 292–420K. An anomalous thermal hysteresis was observed in the ESR intensity and linewidth (Hpp of Cr2O3 · nH2O. This study shows that there could be a dominant water loss/gain during the heating-cooling cycles which is influencing the thermal relaxation time of Cr2O3 · nH2O. A similar hysteresis was observed in the differential scanning calorimetry (DSC) data which correlates well with that of ESR indicating possible surface dehydration/rehydration of Cr2O3 ·nH2O nanoparticles during the heating–cooling cycles of ESR measurements.
Description: Copyright: 2011 American Scientific Publishers. This is an ABSTRACT ONLY.
URI: http://www.ingentaconnect.com/content/asp/nnl/2011/00000003/00000004/art00018
ISSN: 1941-4900
Appears in Collections:Laser physics and technology
General science, engineering & technology

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