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Synthesis and antiferromagnetism of Mn5O8

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3 Author(s)
Punnoose, A. ; Dept. of Phys., West Virginia Univ., Morgantown, WV, USA ; Magnone, H. ; Seehra, M.S.

By reacting manganese nitrate and sodium hydroxide at pH≃12 and heating the product at 400°C for 3 hrs, Mn5O8 with crystallite size ≃14 nm and the Cd2Mn5 O8 structure is produced, as confirmed by x-ray diffraction. Magnetic state of Mn5O8 is investigated by measuring the temperature variations of the magnetic susceptibility χ and the electron spin resonance spectra. The χ versus T variation is characteristic of antiferromagnetic ordering with Neel temperature TN≃128 K. For T>TN, χ follows the Curie-Weiss law, χ=C/(T-θ), with C=14.26 cm3 -W/mole, and θ=-164 K. In ESR, only a single line is observed whose linewidth ΔH fits the variation ΔH(Oe)=1570+A/(T-TN) with γ=1.26, characteristic of a uniaxial antiferromagnet. The magnitude of C is consistent with the Mn22+Mn34+O8 valence state of Mn5O8

Published in:

Magnetics, IEEE Transactions on  (Volume:37 ,  Issue: 4 )

Date of Publication:

Jul 2001

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