Abstract
The efg at V, Nb and Ta in all existing binary alloys with A15 structure has been calculated with the FLAPW technique. It is generally a result of counteracting p- and d-contributions from the conduction band, with a significant effect also of semicore states. For virtually all V and Nb compounds where experimental data are available, these are well reproduced, with the exception of Nb3Sb. A critical test would be a measurement of the quadrupole interaction in the Ta alloys.
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