| Summary: | The magnetic properties of the Fe<sub>1−x</sub>Ag<sub>x</sub>Cr<sub>2</sub>S<sub>4</sub> (0 < x < 0.2) solid solution were investigated in the temperature range 4–300 K in a DC field of 0.1 and 45 kOe. Fe<sub>1−x</sub>Ag<sub>x</sub>Cr<sub>2</sub>S<sub>4</sub> is characterized by the transition temperature from the paramagnetic to the ferromagnetic state (T<sub>c</sub>) and the irreversibility temperature (T<sub>irr</sub>). The replacement of iron with silver ions in Fe<sub>1−x</sub>Ag<sub>x</sub>Cr<sub>2</sub>S<sub>4</sub> leads to an increase in the Curie temperatures from 185 K (x = 0) to 216 K (x = 0.2) and T<sub>cusp</sub> from 45 K (x = 0) to 125 K (x = 0.2). A section of the Fe<sub>1−x</sub>Ag<sub>x</sub>Cr<sub>2</sub>S<sub>4</sub> magnetic phase diagram in the region under study has been constructed. The diagram reveals the following regions: paramagnetic, ferromagnetic, region of conditionally recurrent spin-glass (SG), and below 10 K a region associated with orbital ordering.
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