Lanthanum decahydride

Lanthanum decahydride is a polyhydride or superhydride compound of lanthanum and hydrogen (LaH10) that shows promise of being a high-temperature superconductor. It has a superconducting transition temperature TC ~ 250 K (−23 °C; −10 °F) at a pressure of 150 gigapascals (GPa), which is a record high as of 2019, and its synthesis required pressures above ~160 GPa.[2] A cubic form can be synthezised at 1,000 K (730 °C; 1,340 °F),[2] and a hexagonal crystal structure can be formed at room temperature.[3]

Lanthanum decahydride
Identifiers
Properties
H10La
Molar mass 148.985 g·mol−1
Structure[2]
Cubic
Fm3m
a = 0.43646(5) nm
at 152 GPa
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

The cubic form has each lanthanum atom surrounded by 32 hydrogen atoms, which form the vertices of an 18 faced shape called a chamfered cube.[4]

References
  1. "Lanthanum decahydride". American Chemical Society.
  2. Drozdov, A. P.; Kong, P. P.; Minkov, V. S.; Besedin, S. P.; Kuzovnikov, M. A.; Mozaffari, S.; Balicas, L.; Balakirev, F. F.; Graf, D. E.; Prakapenka, V. B.; Greenberg, E.; Knyazev, D. A.; Tkacz, M.; Eremets, M. I. (2019). "Superconductivity at 250 K in lanthanum hydride under high pressures". Nature. 569 (7757): 528–531. arXiv:1812.01561. doi:10.1038/s41586-019-1201-8. PMID 31118520.
  3. Geballe, Zachary M.; Liu, Hanyu; Mishra, Ajay K.; Ahart, Muhtar; Somayazulu, Maddury; Meng, Yue; Baldini, Maria; Hemley, Russell J. (15 January 2018). "Synthesis and Stability of Lanthanum Superhydrides". Angewandte Chemie International Edition. 57 (3): 688–692. doi:10.1002/anie.201709970. PMID 29193506.
  4. "NNNS chemistry blog: Lanthanum decahydride". chem.vander-lingen.nl.
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