The one-magnon scattering was studied in antiferromagnetic NicMg1-cO solid solutions. We observed unpredicted behavior of both temperature and composition dependences of one-magnon excitation energies. First, the abrupt change of the one-magnon frequency by 7-8 cm(-1) occurs between c=0.98 and c=0.9 in the limit of T -> 0 K. Second, upon increasing temperature, the one-magnon energy for highly diluted nickel oxide vanishes significantly below the Neel temperature.
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