TY - JOUR

T1 - Face-Centered Cubic Platinum Hydride and Phase Diagram of PtH

AU - Semerikova, Anna

AU - Chanyshev, Artem D.

AU - Glazyrin, Konstantin

AU - Pakhomova, Anna

AU - Kurnosov, Alexander

AU - Litasov, Konstantin

AU - Dubrovinsky, Leonid

AU - Rashchenko, Sergey

N1 - Funding Information: The reported study was funded by RFBR according to the research project #18‐35‐20047. The work of A.S. was partially supported by the state assignment of IGM SB RAS. We acknowledge DESY (Hamburg, Germany), a member of the Helmholtz Association HGF, for the provision of experimental facilities. The research was carried out at PETRA III, P02.2 Extreme conditions beamline, proposal #I‐20180048

PY - 2020/12/31

Y1 - 2020/12/31

N2 - Recent research on superconductivity of high-pressure hydrides generated many phase stability calculations with a lack of their experimental verification; a typical example is Pt–H system. The stability of eight PtH structures was predicted, while the experiments revealed the existence of only hexagonal close-packed (hcp) and trigonal PtH. Face-centered cubic (fcc) PtH was predicted to be nearly isoentalpic to the hcp PtH and stable near 100 GPa, but never observed experimentally. Here we report the first synthesis of the fcc PtH using laser-heated diamond anvil cell. It was found to occupy a high-temperature area of the phase diagram in a wide pressure range of 20–100 GPa, being metastable at room temperature. Our results look promising for uncovering weak approximations in current high-pressure hydrides stability ab initio calculations.

AB - Recent research on superconductivity of high-pressure hydrides generated many phase stability calculations with a lack of their experimental verification; a typical example is Pt–H system. The stability of eight PtH structures was predicted, while the experiments revealed the existence of only hexagonal close-packed (hcp) and trigonal PtH. Face-centered cubic (fcc) PtH was predicted to be nearly isoentalpic to the hcp PtH and stable near 100 GPa, but never observed experimentally. Here we report the first synthesis of the fcc PtH using laser-heated diamond anvil cell. It was found to occupy a high-temperature area of the phase diagram in a wide pressure range of 20–100 GPa, being metastable at room temperature. Our results look promising for uncovering weak approximations in current high-pressure hydrides stability ab initio calculations.

KW - High pressure

KW - High temperature

KW - Hydrides

KW - Platinum

KW - HIGH-PRESSURE

KW - SUPERCONDUCTIVITY

KW - LANTHANUM

UR - http://www.scopus.com/inward/record.url?scp=85097020630&partnerID=8YFLogxK

U2 - 10.1002/ejic.202000849

DO - 10.1002/ejic.202000849

M3 - Article

AN - SCOPUS:85097020630

VL - 2020

SP - 4532

EP - 4538

JO - European Journal of Inorganic Chemistry

JF - European Journal of Inorganic Chemistry

SN - 1434-1948

IS - 48

ER -