Mossbauer spectroscopy investigation of Mn-substituted Co-ferrite (Co1.0MnxFe2-xO4)

Krieble, K., Schaeffer, T, Paulsen, J. A., Ring, A. P., Lo, C. C .H. and Snyder, John Evan 2005. Mossbauer spectroscopy investigation of Mn-substituted Co-ferrite (Co1.0MnxFe2-xO4). Journal of Applied Physics 97 (10) , 10F101. 10.1063/1.1846271

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Abstract

Understanding the effect of Mn substitution for Fe in Co ferrite presents a challenge because there are three different transition-metal ions distributed among two distinct crystallographic and magnetic sublattices with complicated superexchange and anisotropic interactions. In this study, a series of six powder samples with compositions Co1.0MnxFe2?xO4 were investigated using transmission Mössbauer spectroscopy. Mössbauer spectroscopy provides an excellent tool for probing the local environment of the Fe atoms present in such materials. Results show two sets of six-line hyperfine patterns for all samples, indicating the presence of Fe in both A and B sites. Identification of sites is accomplished by evidence from hyperfine distribution width, integrated intensity, and isomer-shift data. Increasing Mn concentration was found to decrease the hyperfine field strength at both sites, but at unequal rates, and to increase the distribution width. This effect is due to the relative strengths of Fe–O–X superexchange (X = Fe, Co, or Mn) and the different numbers of the next-nearest neighbors of A and B sites. Results are consistent with a model of Mn substituting into B sites and displacing Co ions onto A sites.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Engineering
Additional Information:	------- Publisher's copyright requirements "Copyright (2004) American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Tian, Y and Li, G and Shinar, J and Wang, N. L. and Cook, B A and Anderegg, J. W. and Constant, A. P. and Russell, A M and Snyder, John Evan (2004) Electrical transport in amorphous semiconducting AlMgB14 films. Applied Physics Letters , 85 (7). pp. 1181-1183. ISSN 10773118 (10.1063/1.1781738)and may be found at http://apl.aip.org/resource/1/applab/v85/i7/p1181_s1."
Publisher:	American Institute of Physics
ISSN:	1089-7550
Last Modified:	18 May 2023 12:47
URI:	https://orca.cardiff.ac.uk/id/eprint/1922

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