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Journal Article

The structural change of lanthanum diiodide upon hydrogenation

MPS-Authors
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Ryazanov,  M.
Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;

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Simon,  A.
Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;

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Mattausch,  Hj.
Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;
Department Nanochemistry (Bettina V. Lotsch), Max Planck Institute for Solid State Research, Max Planck Society;

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Kremer,  R. K.
Former Scientific Facilities, Max Planck Institute for Solid State Research, Max Planck Society;

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Citation

Ryazanov, M., Simon, A., Mattausch, H., & Kremer, R. K. (2004). The structural change of lanthanum diiodide upon hydrogenation. Journal of Alloys and Compounds, 374(1-2), 142-145.


Cite as: https://hdl.handle.net/21.11116/0000-000E-F691-8
Abstract
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.