Crystal structures and low field principal crystal axis magnetic measurements are reported for the antiferromagnetic iron (III) salts A2FeCl5·H2O; A=Rb+, Cs+. The two compounds undergo a zero field paramagnetic to antiferromagnetic phase transition at 6.5 K (A=Cs+) and 10.05 K (A=Rb+). The spin flop magnetic phase is observed in high field measurements. The magnetic field-temperature phase diagrams are reported. All magnetic measurements were recorded on a superconducting susceptometer. The bicritical points are 6.25 K, 14.5 kOe (A=Cs+), 9.75 K, 17.8 KOe (A=Rb+). Crystal data for Cs2FeCl5· H2O: space group Cmcm, Z = 4, a = 7.442(3) Å, b = 17.307(7) Å, c = 8.077(7) Å, V = 1040 Å3, R = 5.2%, 561 reflections. Crystal data for Rb2FeCl5·H2O, space group Pnma, Z = 4, a = 13.825(4) Å, b = 9.918(3) Å, c = 7.100(2) Å, V = 4.9 Å3, 5.7%, 712 reflections.
C. J. O'Connor et al., "Crystal Structures of A₂FeCl₅·H₂O (A=Rb⁺, Cs⁺) and Field Dependent Superconducting Susceptometer Measurements," Journal of Chemical Physics, vol. 70, no. 11, pp. 5161 - 5167, American Institute of Physics (AIP), Jun 1979.
The definitive version is available at https://doi.org/10.1063/1.437357
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© 1979 American Institute of Physics (AIP), All rights reserved.
01 Jun 1979