THE STRUCTURE OF Yb (ND3)5.7

C. Nöldeke , P. Damay , W. Press , F. Leclercq , W. Lippik , M. Foukani

Neutron powder diffraction was performed on five Yb(ND3)x samples prepared with x = 5.5, 5.7, 5.9 6.0 and 6.3. Two different low temperature (2 K) structures are observed ; one (i) mainly showing peaks of a bcc lattice with a0 = 9.076 Å but also weak sc peaks, the other (ii) presenting bcc peaks only with a0 = 9.111 Å. At 17 K the sc peaks in (i) vanish, which indicates the presence of an order- disorder phase transition. For the orientationally disordered structure (ii), Yb(ND3)5.7, showing more disorder at low temperature, a structure refinement with cubic harmonic functions is given.

Domaines: Articles anciens

C. Nöldeke, P. Damay, W. Press, F. Leclercq, W. Lippik, et al.. THE STRUCTURE OF Yb (ND3)5.7. Journal de Physique IV Proceedings, 1991, 01 (C5), pp.C5-339-C5-344. ⟨10.1051/jp4:1991539⟩. ⟨jpa-00250665⟩