Abstract
Results of X-ray, neutron diffraction and magnetic measurements for RNiSb 2 (RPr, Nd and Tb) compounds are presented. All compounds crystallize in the tetragonal CaBe 2Ge 2-type crystal structure and are antiferromagnets with the Néel temperature 6.3 K for R = Pr, 2.3 K for R = Nd and 12 K for R = Tb. Below T N a colinear antiferromagnetic structure of the AF I type is observed for R = Nd, a square modulated structure with the wavevector k = (0, 0, 0.25) for R = Pr and a square and sine modulated with the wavevector k = ( k x , k y , 0) for R = Tb. For R = Pr, Nd and Tb compounds the magnetic moments of the rare earth atoms are parallel to c-axis. The obtained data are analyzed in terms of the exchange interactions theory and crystal electric field.
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