Experimental magnetic-susceptibility study of liquidTlxSe1−xalloys

Abstract

The magnetic susceptibility $\chi$ of semiconducting liquid ${\mathrm{Tl}}_x{\mathrm{Se}}_{1-x}$ alloys has been measured in a temperature range up to 1100°C. The diamagnetism is assumed to be temperature independent and is found to be linear in composition. The paramagnetism for $x<\mathrm{}0.33\mathrm{}$ is attributed to paramagnetic centers at dangling bonds. The activation energy of these centers is 0.68 eV at $x=0\mathrm{}$ and decreases with $x$. The entropy associated with creation of a paramagnetic center also decreases with $x$. These effects are attributed to strong Tl-Se bonding which decreases the complexity of the liquid-Se polymeric structure and decreases the average Se-Se bond strength.