Abstract
Madelung ( U M ) and experimental lattice ( U P ) energies have been determined for the series of lanthanide monosulphides (LnS, Ln=Ce—Lu, excluding Pm). Comparative crystal-field (CF) analysis has been performed for the same series in the point-charge model with inclusion of the ground 4f n and the excited 4f n–1 5d configurations. It has been found that the variations of both U M / U P and the CF parameters for the 4f n–1 5d configuration across the lanthanide series exhibit minima for the magnetic semiconductors SmS, EuS, and YbS.
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