Pressure induced transformation and subsequent amorphization of monoclinic Nb2O5 and its effect on optical properties
- Jilin Univ., Changchun (China). State Key Lab. of Superhard Materials
- Jilin Univ., Changchun (China). State Key Lab. of Superhard Materials; Carnegie Inst. of Washington, Argonne, IL (United States). High Pressure Collaborative Access Team (HPCAT). Geophysical Lab.
- Chinese Academy of Sciences (CAS), Beijing (China). Beijing Synchrotron Radiation Facility. Inst. of High Energy Physics
- Carnegie Inst. of Washington, Argonne, IL (United States). High Pressure Collaborative Access Team (HPCAT). Geophysical Lab.
- Center for High Pressure Science and Technology Advanced Research, Beijing (China)
- Carnegie Inst. of Washington, Argonne, IL (United States). High Pressure Collaborative Access Team (HPCAT). Geophysical Lab.; Argonne National Lab. (ANL), Argonne, IL (United States). X-ray Science Division
Pressure-induced phase transitions of monoclinic H-Nb2O5 have been studied here by in situ synchrotron x-ray diffraction, pair distribution function (PDF) analysis, and Raman and optical transmission spectroscopy. The initial monoclinic phase is found to transform into an orthorhombic phase at ~9 GPa and then change to an amorphous form above 21.4 GPa. The PDF data reveal that the amorphization is associated with disruptions of the long-range order of the NbO6 octahedra and the NbO7 pentagonal bipyramids, whereas the local edge-shares of octahedra and the local linkages of pentagonal bipyramids are largely preserved in their nearest neighbors. Upon compression, the transmittance of the sample in a region from visible to near infrared (450–1000 nm) starts to increase above 8.0 GPa and displays a dramatic enhancement above 22.2 GPa, indicating that the amorphous form has a high transmittance. The pressure-induced amorphous form is found to be recoverable under pressure release, and maintain high optical transmittance property at ambient conditions. The recoverable pressure induced amorphous material promises for applications in multifunctional materials.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States); Carnegie Inst. of Science, Argonne, IL (United States); Jilin Univ., Changchun (China); Chinese Academy of Sciences (CAS), Beijing (China)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE National Nuclear Security Administration (NNSA); National Natural Science Foundation of China (NSFC); National Basic Research Program of China; Program for Changjiang Scholars and Innovative Research Team in University (China); China Scholarship Council; Cheung Kong Scholars Programme of China
- Grant/Contract Number:
- AC02-06CH11357; FG02-99ER45775; NA0001974; 11374120; 11604116; 51320105007; 2011CB808200; IRT1132
- OSTI ID:
- 1495700
- Journal Information:
- Journal of Physics. Condensed Matter, Vol. 31, Issue 10; ISSN 0953-8984
- Publisher:
- IOP PublishingCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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