Abstract
The electric-field gradient (EFG) of dilute 111Cd nuclei in compounds of the Hg-In alloy system has been investigated by perturbed angular correlation (PAC) measurements of the electric quadrupole interaction (QI) of 111Cd on In sites. It has been found that, as in the pure metals Hg and In, the quadrupole frequency decreases with increasing temperature according to the relation nu q(T)= nu q(0)(1-BT32/). The strength constant B in the intermetallic phases, however, is up to 35% smaller than in the pure metals. The QI parameters are consistent with an orthorhombic gamma -Pu-type lattice for beta -Hg (Hg80In20), but are difficult to reconcile with the structures proposed for HgIn. An intermetallic compound HgIn2 has not been observed.
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