Effect of thallium on magnetic susceptibility of arsenic sulphides

Magnetic susceptibility was studied of samples of Tl_2xAs₂S_3+x and Tl_2xAs₂S₄ series where 0x1 differing in abundance of bonds in structural units. Absolute value of specific magnetic susceptibility decreases with increasing thallium content. Separation of susceptibility in dia- and paramagnetic parts made it possible to refer to the correlation of absorption edge position and paramagnetic susceptibility component.