Joseph Joly, V. L. ; Khollam, Y. B. ; Joy, P. A. ; Gopinath, C. S. ; Date, S. K. (2001) Unusual charge disproportionation and associated magnetic behaviour in nanocrystalline LaMn0.5Co0.5O3 Journal of Physics: Condensed Matter, 13 (48). pp. 11001-11007. ISSN 0953-8984
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Official URL: http://iopscience.iop.org/0953-8984/13/48/324/
Related URL: http://dx.doi.org/10.1088/0953-8984/13/48/324
Abstract
Evidence for an unusual double charge disproportionation, Mn4+ + Co2+ → Mn3+ + Co3+ → Mn4+ + Co2+, is observed in nanocrystalline LaMn0.5Co0.5O3 synthesized by a low-temperature method and annealed in the temperature range 200-1300°C. The Curie temperature of nanocrystalline LaMn0.5Co0.5O3 is increased from 150 to 230 K when annealed in the temperature range 200-700°C and is further decreased back to 150 K when annealed in the temperature range 700-1300°C. This increase and decrease in Tc is found to be associated with the conversion of the spin states of Mn and Co from Mn4+ and Co2+ to Mn3+ and low-spin Co3+, and again back to Mn4+ and Co2+ as evidenced from X-ray photoelectron spectroscopic studies.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to Institute of Physics. |
| ID Code: | 61803 |
| Deposited On: | 15 Sep 2011 12:10 |
| Last Modified: | 15 Sep 2011 12:10 |
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