Lattice distortions measured in actinide ferromagnets PuP, NpFe2 and NpNi2

Abstract
X-ray low-temperature measurements indicate that : (1) cubic PuP distorts to tetragonal below Tc = 125 K with accompanying line broadening, (2) NpFe2 exhibits a rhombohedral angle distortion from 60 to 60.53° below Tc ~ 500 K, and (3) in NpNi2 the rhombohedral angle changes 0.19° ( ±0.02°) below Tc = 32 K

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