The polycrystalline samples of Zn-doped Fe1−xZnxCr2S4 (0.1⩽x⩽0.9) have been studied with x-ray diffraction, magnetization, and Mössbauer spectra measurements. Magnetic structure transforms from the ferromagnetic (0.1⩽x⩽0.5) to the antiferromagnetic phase (0.7⩽x⩽0.9). The Mössbauer spectra of Fe1−xZnxCr2S4 show asymmetrical eight lines due to electric quadrupole interactions below 10K. The magnetic hyperfine field and electric quadrupole interaction for the sample x=0.5 at 4.2K have been fitted with Mössbauer hyperfine parameters of Hhf=116kOe, θ=27°, φ=0°, η=0.60, EQ=2.28mm∕s, and R=2.9. We have observed that the magnetic hyperfine field Hhf decreases with increasing Zn concentration in the ferrimagnetic range (0.1⩽x⩽0.5) at 4.2K, while it increases in the antiferromagnetic region (0.7⩽x⩽0.9). This indicates the changes in the orbital current field contribution depending on Zn concentration in Fe1−xZnxCr2S4.

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The polycrystalline sample of Zn doped Fe 1-x Zn x Cr 2 S 4 (x = 0.1, 0.3) were prepared by solid state reaction. The crystal structure was determined to be the normal cubic spinel of space group Fd3m and the lattice constants(x = 0.1, 0.3) were a 0 = 9.9967(3) Å and a 0 = 9.9926(3) Å, respectively. The magnetic moment values of Fe 1-x Zn x Cr 2 S 4 for the x = 0.3 were observed higher than that of the x = 0.1. The Néel temperatures were decreased to 153 K (x = 0.1), 135 K (x = 0.3) with Zn substitution concentration. This result is due to the decrease of A-B superexchange interaction by the replacement of Zn ions for A site.

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