Full-text resources of PSJD and other databases are now available in the new Library of Science.
Visit https://bibliotekanauki.pl

PL EN


Preferences help
enabled [disable] Abstract
Number of results
2011 | 120 | 2 | 316-321

Article title

Magnetic Properties of Mn-Doped Amorphous SiO_2 Matrix

Content

Title variants

Languages of publication

EN

Abstracts

EN
Samples of Mn-doped amorphous SiO_2 matrix with manganese concentration 0.7 and 3 at.% have been prepared by a sol-gel method. Transmission electron microscopy analysis has shown that the samples contain agglomerates of amorphous silica particles 10 - 20 nm in size. Two types of Mn-rich particles are dispersed in silica matrix, smaller nanoparticles with dimensions between 3 and 10 nm, and larger crystalline areas consisting of aggregates of the smaller nanoparticles. High-temperature magnetic susceptibility reveals that dominant magnetic phase at higher temperatures is λ-MnO_2. At temperatures below T_{C}=43 K strong ferrimagnetism originating from the minor Mn_3O_4 phase masks the relatively weak magnetism of λ-MnO_2. Magnetic field dependence of the maximum in the zero-field-cooled magnetization for both the samples in the vicinity of 40 K, and a frequency shift of the real component of the AC magnetic susceptibility in the sample with 3 at.% Mn suggest that the magnetic moments of the smaller Mn_3O_4 nanoparticles with dimensions below 10 nm are subject to thermally activated blocking process just below the Curie temperature T_{C}. The low-temperature maximum in the zero-field-cooled magnetization observed for both the samples below 10 K indicates possible spin glass freezing of the magnetic moments in the geometrically frustrated Mn sublattice of the λ-MnO_2 crystal structure.

Keywords

EN

Contributors

  • Vinča Institute of Nuclear Sciences, University of Belgrade, P.O.Box 522, 11001 Belgrade, Serbia
  • Vinča Institute of Nuclear Sciences, University of Belgrade, P.O.Box 522, 11001 Belgrade, Serbia
author
  • Vinča Institute of Nuclear Sciences, University of Belgrade, P.O.Box 522, 11001 Belgrade, Serbia
author
  • Institute of Mathematics, Physics and Mechanics, Jadranska 19, 1000 Ljubljana, Slovenia
author
  • Jožef Stefan Institute, Department for Materials Synthesis, Jamova 39, 1000 Ljubljana, Slovenia

References

  • 1. G.H. Lee, S.H. Huh, J.W. Jeong, B.J. Choi, S.H. Kim, H.C. Ri, J. Am. Chem. Soc. 124, 12094 (2002) and references therein
  • 2. M.M. Thackeray, Prog. Solid St. Chem. 25, 1 (1997)
  • 3. M. Wakihara, Materials Science and Engineering R33, 109 (2001)
  • 4. P.G. Bruce, B. Scrosati, J.M. Tarascon, Angew. Chem. Int. Ed. 47, 2930 (2008)
  • 5. J.E. Greedan, N.P. Raju, A.S. Wills, C. Morin, S.M. Shaw, J.N. Reimers, Chem. Mater. 10, 3058 (1998)
  • 6. Young-II Jang, B. Huang, F.C. Chou, D.R. Sadoway, Y.M. Chiang, J. Appl. Phys. 87, 7382 (2000)
  • 7. A.S. Wills, N.P. Raju, J.E. Greedan, Chem. Mater. 11, 1510 (1999)
  • 8. J.R. Martínez, S. Palomares-Sánchez, G. Ortega-Zarzosa, F. Ruiz, Y. Chumakov, Materials Letters 60, 3526 (2006)
  • 9. A. Sundaresan, R. Bhargavi, N. Rangarajan, U. Siddesh, C.N.R. Rao, Phys. Rev. B 74, 161306(R) (2006)
  • 10. D.W. Abraham, M.M. Frank, S. Guha, Appl. Phys. Lett. 87, 252502 (2005)
  • 11. F. Luo, W. Song, C.H. Yan, Chem. Phys. Lett. 431, 337 (2006)
  • 12. A.M.A. Hashem, H.A. Mohamed, A. Bahloul, A.E. Eid, C.M. Julien, Ionics 14, 7 (2008)
  • 13. N. Wang, Y. Gao, J. Gong, X. Ma, X. Zhang, Y. Guo, L. Qu, Eur. J. Inorg. Chem. 3827 (2008)
  • 14. K. Dwight, N. Menyuk, Phys. Rev. 119, 1470 (1960)
  • 15. N. Wang, L. Guo, L. He, X. Cao, C. Chen, R. Wang, S. Yang, Small 3, 606 (2007)
  • 16. E. Winkler, R.D. Zysler, D. Fiorani, Phys. Rev. B 70, 174406 (2004)
  • 17. Y.Q. Chang, X.Y. Xu, X.H. Luo, C.P. Chen, D.P. Yu, J. Cryst. Growth 264, 232 (2004)
  • 18. R.J. Tackett, J.G. Parsons, B.I. Machado, S.M. Gaytan, L.E. Murr, C.E. Botez, Nanotechnology, 21, 365703 (2010)

Document Type

Publication order reference

Identifiers

YADDA identifier

bwmeta1.element.bwnjournal-article-appv120n223kz
JavaScript is turned off in your web browser. Turn it on to take full advantage of this site, then refresh the page.