作者:M Ryazanov、A Simon、Hj Mattausch、R.K Kremer
DOI:10.1016/j.jallcom.2003.11.072
日期:2004.7
Slowly heating LaI2 under 1 atm hydrogen to 650degreesC leads to LaI2H, analyzed as LaI2H0.95(3), accompanied by a structural change from tetragonal to hexagonal. Sharp reflections in the XRD pattern can be indexed in P6(3)/MMC with a = 4.2158(7) Angstrom and c = 15.508(3) Angstrom, however, diffuse reflections indicate a polytypic intergrowth of MoS2 and NbS2, type structures. The earlier determined miscibility gap between LaI2 and LaI2Hx (x approximate to 0.5) is closely related to the change of the structure. The Pauli paramagnetism for LaI2, chi(p) = 43(2) x 10(-6) cm(3)/mol, derived from measurements on LaI2 and LaI2H is in good agreement with the value estimated from band structure calculations. (C) 2003 Elsevier B.V. All rights reserved.