Shantha Shankar, K. ; Kar, Sohini ; Subbanna, G. N. ; Raychaudhuri, A. K. (2004) Enhanced ferromagnetic transition temperature in nanocrystalline lanthanum calcium manganese oxide (La0.67Ca0.33MnO3) Solid State Communications, 129 (7). pp. 479-483. ISSN 0038-1098
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Official URL: http://linkinghub.elsevier.com/retrieve/pii/S00381...
Related URL: http://dx.doi.org/10.1016/j.ssc.2003.10.029
Abstract
We report a novel, low temperature (450-600°C) route for the synthesis of highly crystalline and homogeneous nanoparticles of lanthanum calcium manganese oxide La0.67Ca0.33MnO3 (LCMO). The nanocrystallites, with average particle size of 30 nm, possess a ferromagnetic-paramagnetic transition temperature (Tc) of 300 K, which is about 50 K higher than that of a bulk single crystal. The transition temperature was found to be inversely proportional to the particle size. The Rietveld analysis of the powder X-ray diffraction data of the phase-pure nanopowders reveals that the particle size reduction leads to a significant contraction of the unit cell volume and a reduction of the unit cell anisotropy. We propose that these two lattice effects are responsible for the observed enhancement in Tc.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to Elsevier Science. |
| Keywords: | Nanostructures; Chemical Synthesis; Crystal Structure and Symmetry; Phase Transitions |
| ID Code: | 42654 |
| Deposited On: | 04 Jun 2011 13:41 |
| Last Modified: | 04 Jun 2011 13:41 |
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