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Title: Phosphorus Dimerization in Gallium Phosphide at High Pressure

Journal Article · · Inorganic Chemistry
ORCiD logo [1];  [1];  [2]; ORCiD logo [3];  [1];  [1];  [4];  [2]
  1. Univ. of Nevada, Las Vegas, NV (United States)
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  3. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
  4. 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
Citation Metrics:
Cited by: 9 works
Citation information provided by
Web of Science

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Cited By (4)

Excitons in InP, GaP, and Ga x In 1 x P 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


Figures / Tables (6)


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