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Low Temperature Magnetic Properties of Some New High-Pressure Perovskite Phases of Iron II: Observation of Novel Slow Paramagnetic Relaxation in CaFe2Ti2O6 and CaFe3Ti4O12

Published online by Cambridge University Press:  15 February 2011

W. M. Reiff ,
K. Leinenweber  and
J. Parise
W. M. Reiff
Affiliation:
Department of Chemistry, Northeastern University, Boston, MA 02115.
K. Leinenweber
Affiliation:
Department of Chemistry, Arizona State University, Tempe, AZ 85287–1604
J. Parise
Affiliation:
Center for High Pressure Research, Dept. of Earth and Space Science, University at Stony Brook, Stony Brook, NY 11794–2100
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Abstract

Results of iron-5 7 Mössbauer spectroscopy and ac and dc susceptibility study of the double perovskite phases, CaFeTi2O6 (A) and CaFe3Ti4O12 (B) are presented. Both phases exhibit spectral broadening effects with decreasing temperature and incipient magnetic hyperfine splitting attributable to novel slow paramagnetic relaxation at the tetrahedral and square planar sites of (A) and the square planar sites of (B). The temperature dependence of magnetic moment for (A) corresponds to classical single ion zero field splitting, while that of (B) indicates antiferromagnetic exchange interactions. There is no evidence of cooperative long range magnetic order in these materials.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 453: Symposium R – Solid State Chemistry of Inorganic Materials , 1996 , 387
Copyright
Copyright © Materials Research Society 1997

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References

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