A study of the ferrimagnetic ordering of the complex bimetallic salt hexaaminechromium (III) hexachloroferrate (III), [Cr (NH3)6] [FeCl6]

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Abstract
The magnetic susceptibility of a powdered sample of [Cr (NH3)6][FeCl6] has been measured in the temperature range 1.85 to 110 K in applied magnetic fields of 100 and 10 000 Oe. A magnetic phase transition near 2.8 K is apparent in the low field data set. The transition is confirmed by zero field Mössbauer spectroscopy data. The magnetic data above the phase transition may be fit to the Néel hyperbola for a ferrimagnet: χ−1=(T−θ)/C−ζ/(T−θ’) with best-fit values of C=6.58 emu K, θ=−14.1 K, θ’=2.22 K, and ζ=10.1 emu K. Assuming a structure similar to [Co(NH3)6] [FeCl6] and mean field theory, the intrasublattice coupling constants are 0.12 cm−1, and the intersublattice coupling constant, Jab, is −0.21 cm−1. The value of Jab is confirmed by a change in slope of the magnetization data near 2000 Oe.

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