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Electron Spin Resonance Study of α-Cr2O3 and Cr2O3·nH2O Quasi-Spherical Nanoparticles

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The quasi-spherical nanoparticles of hydrated Cr2O3·nH2O, and crystalline α-Cr2O3, have been synthesized by reduction of the first row (3d) transition metal complex of K2Cr2O7. The temperature-dependence of electron spin resonance (ESR) spectrum was studied in terms of g-factor, line width and intensity. ESR of both Cr2O3·nH2O and α-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 (ΔH pp) 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.
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Keywords: CHROMIUM(III) OXIDE; ELECTRON SPIN RESONANCE (ESR); TEMPERATURE DEPENDENCE ESR; THERMAL RELAXATION TIME

Document Type: Short Communication

Publication date: August 1, 2011

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  • Nanoscience and Nanotechnology Letters (NNL) is a multidisciplinary peer-reviewed journal consolidating nanoscale research activities in all disciplines of science, engineering and medicine into a single and unique reference source. NNL provides the means for scientists, engineers, medical experts and technocrats to publish original short research articles as communications/letters of important new scientific and technological findings, encompassing the fundamental and applied research in all disciplines of the physical sciences, engineering and medicine.
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