Lanthanum decahydride
Identifiers
3D model (JSmol)
  • 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 has shown evidence of being a high-temperature superconductor. It has a superconducting transition temperature TC around 250 K (−23 °C; −10 °F) at a pressure of 150 gigapascals (22×10^6 psi), and its synthesis required pressures above approximately 160 gigapascals (23×10^6 psi).[2][3]

Synopsis

The compound exhibits a Meissner effect below the superconducting transition temperature.[4] A cubic form can be synthesized at 1,000 K (730 °C; 1,340 °F),[2] and a hexagonal crystal structure can be formed at room temperature.[5]

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.[6]

A similar compound, lanthanum boron octahydride, was computationally predicted to be a superconductor at 126 K (−147 °C; −233 °F) and pressure 50 gigapascals (7.3×10^6 psi).[7]

References

  1. ↑ "Lanthanum decahydride". American Chemical Society.
  2. 1 2 3 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. Bibcode:2019Natur.569..528D. doi:10.1038/s41586-019-1201-8. PMID 31118520. S2CID 119231000.
  3. ↑ M. Kostrzewa; K. M. Szczęśniak; A. P. Durajski; R. Szczęśniak (31 January 2020). "From LaH10 to room–temperature superconductors". Scientific Reports. 10 (1): 1592. arXiv:1905.12308. Bibcode:2020NatSR..10.1592K. doi:10.1038/s41598-020-58065-9. PMC 6994605. PMID 32005852.
  4. ↑ Eremets, M. I.; Minkov, V. S.; Drozdov, A. P.; Kong, P. P.; Ksenofontov, V.; Shylin, S. I.; Bud'ko, S. L.; Prozorov, R.; Balakirev, F. F.; Sun, Dan; Mozzafari, S.; Balicas, L. (10 January 2022). "High‑Temperature Superconductivity in Hydrides: Experimental Evidence and Details". Journal of Superconductivity and Novel Magnetism. 35 (4): 965–977. arXiv:2201.05137. doi:10.1007/s10948-022-06148-1.
  5. ↑ 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.
  6. ↑ "NNNS chemistry blog: Lanthanum decahydride". chem.vander-lingen.nl.
  7. ↑ Di Cataldo, Simone; Heil, Christoph; von der Linden, Wolfgang; Boeri, Lilia (2021-07-29). "BH8: Towards high-Tc low-pressure superconductivity in ternary superhydrides". Physical Review B. 104 (2): L020511. arXiv:2102.11227. Bibcode:2021PhRvB.104b0511D. doi:10.1103/PhysRevB.104.L020511. S2CID 242872381.
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