Zero- and high-field Mössbauer spectroscopy, vibrating-sample magnetometry, and Faraday balance measurements have been used to characterize polycrystalline samples of the complex bimetallic salt [Co(pn)3] [FeCl6]. The material orders as a simple, uniaxial three-dimensional antiferromagnet at T(Néel) = ~9 K. The saturation value of its internal hyperfine field is 505 kG. Magnetization measurements for applied fields up to ~14 kG in the range 1.8-4.2 K show an absence of field-induced (spin-flop) behavior. However, high-field Mössbauer spectroscopy measurements at 4.2 K for longitudinal fields of 3 and 6 T are consistent with a field-induced magnetic phase transformation (spin flop) for H0 > 14 kG. Zero-field Mössbauer spectra show that the related system [Co(NH3)6] [FeCl6] is a rapidly relaxing paramagnet to as low as 1.6 K.
ASJC Scopus subject areas
- Physical and Theoretical Chemistry
- Inorganic Chemistry