Abstract
The temperature dependence of the molar magnetic susceptibility of NBu4Zn(II)x Fe(II)1-x [Fe(III)(ox)3] compounds, where NBu4+=tetra-n-butylammonium ion and ox2-=oxalate ion with 0≤x<1 were studied in the temperature range of 5-290 K. The compounds with x≤0.1 showed two susceptibility maxima on temperature scale in 40.5-43.5 K and 10-24 K temperature ranges. These compounds undergo ferrimagnetic transition in the 40.5-43.5 K range. The difference in their magnetic susceptibility variations with temperature in the field-cooled and zero field-cooled modes indicated that these compounds exist in a “spin-glass” like state below 35 K range. The molar magnetic susceptibility variation with temperature obeys the Curie-Weiss law at higher temperatures ( >90±10 K). Several x dependent Curie-Weiss constant were evaluated.
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