Lanthanum decahydride

Source: Wikipedia, the free encyclopedia.
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
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).

Lanthanum decahydride is a

superconductor. It was the first metal superhydride to be theoretically predicted,[2][3] synthesized,[4] and experimentally confirmed[5] to superconduct at near room-temperatures. 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).[6][7]

Synopsis

Since its discovery,[8] the superconducting properties of LaH10 and other lanthanum-based superhydrides have been experimentally confirmed in multiple independent experiments.[9][10][11][12] The compound exhibits a Meissner effect below the superconducting transition temperature.[13] A cubic form can be synthesized at 1,000 K (730 °C; 1,340 °F),[6] and a hexagonal crystal structure can be formed at room temperature.[14] Further reports indicate Tc is increased with nitrogen doping,[15] and decreased with the introduction of magnetic impurities.[16]

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.[17]

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).[18]

References

  1. ^ "Lanthanum decahydride". American Chemical Society.
  2. PMID 28949166
    .
  3. PMID 28630301
    .
  4. ISSN 0044-8249
    .
  5. PMID 30720326
    .
  6. ^
    S2CID 119231000
    .
  7. PMID 32005852
    .
  8. PMID 30720326
    .
  9. S2CID 119231000
    .
  10. S2CID 250921188
    .
  11. ISSN 1369-7021
    .
  12. S2CID 247447065
    .
  13. doi:10.1007/s10948-022-06148-1
    .
  14. PMID 29193506
    .
  15. S2CID 229371105
    .
  16. PMID 39
    .
  17. ^ "NNNS chemistry blog: Lanthanum decahydride". chem.vander-lingen.nl.
  18. S2CID 242872381
    .
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