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# Particle-size effects on the value of $T_c$ of $MnFe_2O_4$: Evidence for finite-size scaling

Kulkarni, GU and Kannan, KR and Arunarkavalli, T and Rao, CNR (1994) Particle-size effects on the value of $T_c$ of $MnFe_2O_4$: Evidence for finite-size scaling. In: Physical Review B, 49 (1). pp. 724-727.

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## Abstract

$^{57}Fe$ Mossbauer measurements show that the $T_c$ of $\langle{12}\rangle$-nm particles of $MnFe_2O_4$ is higher than that of the $\langle{33}\rangle$-nm particles, which exhibit the bulk $T_c$ value (573 K). The $^{57}Fe$ isomer shift as well as the internal field are, however, independent of the particle size, as is the cation distribution determined by Mn and Fe extended x-ray absorption fine structure and Mn x-ray absorption near-edge structure measurements at different temperatures. The results confirm that the higher $T_c$ of the $\langle{12}\rangle$rim particles arises from finite-size scaling.

Item Type: Journal Article Copyright of this article belongs to American Physical Society. Division of Chemical Sciences > Solid State & Structural Chemistry Unit 27 Sep 2006 19 Sep 2010 04:30 http://eprints.iisc.ernet.in/id/eprint/8212

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