Phosphorus Dimerization in Gallium Phosphide at High Pressure
- Univ. of Nevada, Las Vegas, NV (United States)
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
- Carnegie Inst. of Washington, Argonne, IL (United States). Geophysical Lab., High Pressure Collaborative Access Team (HPCAT)
Using combined experimental and computational approaches, we show in this paper that at 43 GPa and 1300 K gallium phosphide adopts the super-Cmcm structure, here indicated with its Pearson notation oS24. First-principles enthalpy calculations demonstrate that this structure is more thermodynamically stable above ~20 GPa than previously proposed polymorphs. In contrast to other polymorphs, the oS24 phase shows a strong bonding differentiation and distorted fivefold coordination geometries of both P atoms. The shortest bond of the phase is a single covalent P–P bond measuring 2.171(11) Å at synthesis pressure. Phosphorus dimerization in GaP sheds light on the nature of the super-Cmcm phase and provides critical new insights into the high-pressure polymorphism of octet semiconductors. Bond directionality and anisotropy explain the relatively low symmetry of this high-pressure phase.
- Research Organization:
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- USDOE National Nuclear Security Administration (NNSA); National Aeronautics and Space Administration (NASA); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; National Science Foundation (NSF)
- Grant/Contract Number:
- AC04-94AL85000; AC52-07NA27344; NA0001982; NNX10AN23H; NA0003525; NA0001974; FG02-99ER45775; AC02−06CH11357; EAR 11- 57758; EAR-1128799; FG02-94ER14466
- OSTI ID:
- 1469659
- Alternate ID(s):
- OSTI ID: 1581485
- Report Number(s):
- SAND2017-7495J; LLNL-JRNL-699313; 655398
- Journal Information:
- Inorganic Chemistry, Vol. 57, Issue 5; ISSN 0020-1669
- Publisher:
- American Chemical Society (ACS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Excitons in InP, GaP, and quantum dots: Insights from time-dependent density functional theory
|
journal | December 2019 |
Gold nanorods as a high-pressure sensor of phase transitions and refractive-index gauge
|
journal | January 2019 |
Electrical Transport Properties of Gallium Phosphide under High Pressure
|
journal | September 2019 |
Excitons in InP, GaP, GaInP quantum dots: Insights from time-dependent density functional theory | text | January 2019 |
Similar Records
Effect of stress on melting of rhombohedral bismuth
High pressure and temperature equation of state and spectroscopic study of CeO 2