Lanthanum decahydride

Summary

Lanthanum decahydride
Identifiers
  • 1130489-79-0[1]
3D model (JSmol)
  • Interactive image
  • InChI=1S/La.10H
    Key: WKJDXOLLSPZSBN-UHFFFAOYSA-N
  • [LaH10]
Properties
H10La
Molar mass 148.985 g·mol−1
Structure[2]
Cubic
Fm3m
a = 5.1019(5) Å
at 150 GPa
132.80(4) Å3
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

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), 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]

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]

A similar compound LaH8 has also shown evidence of superconductivity[5]

References

  1. ^ "Lanthanum decahydride". American Chemical Society.
  2. ^ a b c 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. S2CID 119231000.
  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.
  5. ^ Di Cataldo, Simone; Heil, Christoph; von der Linden, Wolfgang; Boeri, Lilia (2021-07-29). "$\mathrm{La}{\mathrm{BH}}_{8}$: Towards high-${T}_{c}$ low-pressure superconductivity in ternary superhydrides". Physical Review B. 104 (2): L020511. arXiv:2102.11227. doi:10.1103/PhysRevB.104.L020511.