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Magnetism and Recoilless Fraction of Cerium-Doped Hematite Nanoparticles System

Published online by Cambridge University Press:  26 February 2011

Monica Sorescu  and
Lucian Diamandescu
Monica Sorescu
Affiliation:
sorescu@duq.edu, Duquesne University, Physics, 600 Forbes Ave, Pittsburgh, PA, 15282, United States, (412) 396-4166, (412) 396-4829
Lucian Diamandescu
Affiliation:
diamand@infim.ro, National Institute for Materials Physics, Materials Science, Bucharest, 77125, Romania
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Abstract

Cerium-doped hematite particles of the type xCeO2-(1-x)α-Fe2O3 (x=0.1, 0.5) were synthesized using mechanochemical activation and characterized by X-ray diffraction (XRD) and Mössbauer spectroscopy. XRD patterns yielded the dependence of lattice parameters and particle size as a function of ball milling time for each value of the molar concentration x. For x=0.1, the Mössbauer spectra were fitted with one or alternatively, two sextets, corresponding to Ce ions substituting Fe ions in the hematite structure. For x=0.5, Mössbauer spectra fitting required the addition of a quadrupole-split doublet, representing Fe substituting Ce in the CeO2 lattice. We evidenced this transition using our recently developed method for precise determination of the recoilless fraction in a single room-temperature transmission Mössbauer measurement of a two-absorber sample. We observed the occurrence of a minimum in the values of the recoilless fraction for t=4 hours of milling, followed by a further decrease of the f factor due to the appearance of nanoparticles in the system.

Keywords

mechanical alloyingmagnetic propertiesx-ray diffraction (XRD)
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1032: Symposium I – Nanoscale Magnetic Materials and Applications , 2007 , 1032-I14-13
Copyright
Copyright © Materials Research Society 2008

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References

1. Gopel, W., Sens. Actuators B 18–19, 1 (1994).Google Scholar
2. Yamazoe, N., Miura, N., Sens. Actuators B 20, 95 (1994).10.1016/0925-4005(93)01183-5Google Scholar
3. Tamaki, J., Naruo, C., Yamamoto, Y., Matsuoka, M., Sens. Actuators B 83, 190 (2002).10.1016/S0925-4005(01)01039-5Google Scholar
4. Jiang, J. Z., Liu, R., Nielsen, K., Poulsen, F. W., Berry, F. J., Clasen, R., Phys. Rev. B 55, 11 (1997).10.1103/PhysRevB.55.11Google Scholar
5. Jiang, J. Z., Liu, R., Nielsen, K., Morup, S., Dam-Johansen, K., Clasen, R., J. Phys. D: Appl. Phys. 30, 1459 (1997).Google Scholar
6. Zhu, W., Tan, O. K., Jiang, J. Z., J. Mater. Electron. 9, 275 (1998).10.1023/A:1008820605197Google Scholar
7. Tan, O. K., Zhu, W., Yan, Q., Kong, L. B., Sens. Actuators B 65, 361 (2000).10.1016/S0925-4005(99)00414-1Google Scholar
8. Reddy, C. V. Gopal, Cao, W., Tan, O. K., Zhu, W., Sens. Actuators B 81, 170 (2002).10.1016/S0925-4005(01)00948-0Google Scholar
9. Cassedanne, J., An. Bras. Cienc. 38, 265 (1966).Google Scholar
10. Takano, H., Bando, Y., Nakanishi, N., Sakai, M., Okinaka, H., J. Solid State Chem. 68, 153 (1987).10.1016/0022-4596(87)90298-2Google Scholar
11. Sorescu, M., Mater. Lett. 54, 256 (2002).10.1016/S0167-577X(01)00572-9Google Scholar