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Kelsall, Liam C.
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article
Praseodymium polyhydrides synthesized at high temperatures and pressures
Abstract
Rare earth element polyhydrides have been predicted to exhibit high-T<SUB>c</SUB> superconductivity at extreme compressions. Through a series of in situ high-pressure high-temperature x-ray powder diffraction experiments combined with density functional theory calculations, we report the emergence of polyhydride species in the praseodymium-hydrogen system. We initially observe the formation of PrH<SUB>3</SUB>, which continuously increases in hydrogen content on compression towards PrH<SUB>4</SUB>. Laser heating PrH<SUB>4</SUB> in a hydrogen medium at pressures of 85 GPa leads to the synthesis of both PrH<SUB>9</SUB> and PrH<SUB>7</SUB>. Both structures are characterized by hexagonal arrays of praseodymium atoms surrounded by hydrogen clathrate cages....