Abstract
The lattice constants of 24 LaH x samples in the hydrogen concentration range 1.93 ⩽ x ⩽ 2.90 were measured in the temperature range 110–140 K. Three different composition ranges of a cubic-to-tetragonal distortion were found. The low temperature subsolidus phase diagram of the lanthanum sublattice was constructed based on the X-ray measurements. The structure of the lanthanum trihydride is possibly non-cubic or has a phase transition to a non-cubic modification.
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