Results of low temperature specific heat measurements (1.6 to 10 K) on NizTSn (T = Ti, Zr, Hf) isoelectronic Heusler compounds are presented. Some comments are made about the electronic structure, the existence of lattice anomalies is suggested, and the elastic constant ratios are estimated.Mesures de chaleur spkcifique a basses tempkratures (1.6 B 10 K) des composks de Heusler isoklectroniques NizTSn (T = Ti, Zr, Hf) sont present&. Quelques remarques sont faites sur la structure Clectronique et 1' existence d'anomalies de rbeau est proposk. Finalement les rapports des constantes klastiques sont estimks.
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