Seven-Coordinated “Metallic” WO3 at High Pressures
Abstract
In this work, we have studied the pressure-induced structural and electronic phase transitions in WO3 to 60 GPa using micro-Raman spectroscopy, synchrotron X-ray diffraction, and electrical resistivity measurements. The results indicate that WO3 undergoes a series of phase transitions with increasing pressure: triclinic WO3-I initially transforms to monoclinic WO3-II (P21/c) at 1 GPa, involving a tetrahedral distortion in a corner-shared octahedral framework, and then to a mixed corner and edge-shared seven-coordinated WO3-III (P21/c) at 27 GPa with a large volume change of ~6% and further to WO3-IV (Pc) above 37 GPa. These structural phase transitions also accompany a significant drop in resistivity from insulating WO3-I to semiconducting WO3-II, and poor metallic WO3-III and IV, arising from the Jahn–Teller distortion in WO6 and the hybridization between O 2p and W 5d orbitals in WO7, respectively. Unlike its molecular analogue of MoO3, the transitions in WO3 show little effect on the use of different pressure transmitting media.
- Authors:
-
- Washington State Univ., Pullman, WA (United States); Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
- Washington State Univ., Pullman, WA (United States)
- Publication Date:
- Research Org.:
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA); National Science Foundation (NSF); US Army Research Office (ARO)
- OSTI Identifier:
- 1760358
- Report Number(s):
- SAND-2020-12999J
Journal ID: ISSN 1932-7447; 692426
- Grant/Contract Number:
- AC04-94AL85000; 1701360; NA0003342; W911NF-17-1-0468; 2018A1661; AC02-06CH11357; NA0003525
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Physical Chemistry. C
- Additional Journal Information:
- Journal Volume: 124; Journal Issue: 49; Journal ID: ISSN 1932-7447
- Publisher:
- American Chemical Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; Crystal structure; chemical structure; oxygen; physical and chemical processes; phase transitions
Citation Formats
Duwal, Sakun, Kim, Minseob, and Yoo, Choong-Shik. Seven-Coordinated “Metallic” WO3 at High Pressures. United States: N. p., 2020.
Web. doi:10.1021/acs.jpcc.0c09005.
Duwal, Sakun, Kim, Minseob, & Yoo, Choong-Shik. Seven-Coordinated “Metallic” WO3 at High Pressures. United States. https://doi.org/10.1021/acs.jpcc.0c09005
Duwal, Sakun, Kim, Minseob, and Yoo, Choong-Shik. Tue .
"Seven-Coordinated “Metallic” WO3 at High Pressures". United States. https://doi.org/10.1021/acs.jpcc.0c09005. https://www.osti.gov/servlets/purl/1760358.
@article{osti_1760358,
title = {Seven-Coordinated “Metallic” WO3 at High Pressures},
author = {Duwal, Sakun and Kim, Minseob and Yoo, Choong-Shik},
abstractNote = {In this work, we have studied the pressure-induced structural and electronic phase transitions in WO3 to 60 GPa using micro-Raman spectroscopy, synchrotron X-ray diffraction, and electrical resistivity measurements. The results indicate that WO3 undergoes a series of phase transitions with increasing pressure: triclinic WO3-I initially transforms to monoclinic WO3-II (P21/c) at 1 GPa, involving a tetrahedral distortion in a corner-shared octahedral framework, and then to a mixed corner and edge-shared seven-coordinated WO3-III (P21/c) at 27 GPa with a large volume change of ~6% and further to WO3-IV (Pc) above 37 GPa. These structural phase transitions also accompany a significant drop in resistivity from insulating WO3-I to semiconducting WO3-II, and poor metallic WO3-III and IV, arising from the Jahn–Teller distortion in WO6 and the hybridization between O 2p and W 5d orbitals in WO7, respectively. Unlike its molecular analogue of MoO3, the transitions in WO3 show little effect on the use of different pressure transmitting media.},
doi = {10.1021/acs.jpcc.0c09005},
journal = {Journal of Physical Chemistry. C},
number = 49,
volume = 124,
place = {United States},
year = {Tue Dec 01 00:00:00 EST 2020},
month = {Tue Dec 01 00:00:00 EST 2020}
}
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