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Please use this identifier to cite or link to this item: http://hdl.handle.net/2080/579

Title: Particle size dependence of magnetization and phase transition near TN in multiferroic BiFeO3
Authors: Mazumder, R
Ghosh, S
Mondal, P
Bhattacharya, Dipten
Dasgupta, S
Das, N
Sen, A
Tyagi, A K
Sivakumar, M
Takami, T
Ikuta, H
Issue Date: 2006
Publisher: AIP
Citation: Journal of Applied Physics, Vol 100, 033908, P 9
Abstract: We report results of a comprehensive study of the phase transition at TN (~643 K) as a function of particle size in multiferroic BiFeO3 system. We employed electrical, thermal, and temperature dependent x-ray diffraction studies in order to characterize the transition in a host of samples. We also carried out detailed magnetic measurements over a temperature regime of 2–300 K under a magnetic field of 100–10 000 Oe both on bulk and nanocrystalline systems. While in the bulk system a sharp endothermic peak at TN together with a broad feature, ranging over nearly ~100 K (T), could be observed in calorimetry, the nanoscale systems exhibit only the broad feature. The characteristic dielectric anomaly, expected at TN, is found to occur both at TO and TN across T in the bulk sample. The Maxwell-Wagner component due to interfaces between heterogenous regions with different conductivities is also present. The magnetic properties, measured at lower temperature, corroborate our observations...
Description: Copyright for the article belongs to AIP
URI: http://dx.doi.org/10.1063/1.2229667
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