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Title: Mechanical behaviors and phase transition of Ho 2 O 3 nanocrystals under high pressure

Abstract

Mechanical properties and phase transition often show quite large crystal size dependent behavior, especially at nanoscale under high pressure. Here, we have investigated Ho2O3 nanocrystals with in-situ x-ray diffraction and Raman spectroscopy under high pressure up to 33.5 GPa. When compared to the structural transition routine cubic -> monoclinic -> hexagonal phase in bulk Ho2O3 under high pressure, the nano-sized Ho2O3 shows a much higher onset transition pressure from cubic to monoclinic structure and followed by a pressure-induced-amorphization under compression. The detailed analysis on the Q (Q = 2π/d) dependent bulk moduli reveals the nanosized Ho2O3 particles consist of a clear higher compressible shell and a less compressible core. Insight into these phenomena shed lights on micro-mechanism studies of the mechanical behavior and phase evolution for nanomaterials under high pressure, in general.

Authors:
; ; ; ;
Publication Date:
Research Org.:
Energy Frontier Research Centers (EFRC) (United States). Energy Frontier Research in Extreme Environments (EFree)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1385864
DOE Contract Number:  
SC0001057
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 116; Journal Issue: 3; Related Information: EFree partners with Carnegie Institution of Washington (lead); California Institute of Technology; Colorado School of Mines; Cornell University; Lehigh University; Pennsylvania State University
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; catalysis (heterogeneous), solar (photovoltaic), phonons, thermoelectric, energy storage (including batteries and capacitors), hydrogen and fuel cells, superconductivity, charge transport, mesostructured materials, materials and chemistry by design, synthesis (novel materials)

Citation Formats

Yan, Xiaozhi, Ren, Xiangting, He, Duanwei, Chen, Bin, and Yang, Wenge. Mechanical behaviors and phase transition of Ho 2 O 3 nanocrystals under high pressure. United States: N. p., 2014. Web. doi:10.1063/1.4890341.
Yan, Xiaozhi, Ren, Xiangting, He, Duanwei, Chen, Bin, & Yang, Wenge. Mechanical behaviors and phase transition of Ho 2 O 3 nanocrystals under high pressure. United States. doi:10.1063/1.4890341.
Yan, Xiaozhi, Ren, Xiangting, He, Duanwei, Chen, Bin, and Yang, Wenge. Mon . "Mechanical behaviors and phase transition of Ho 2 O 3 nanocrystals under high pressure". United States. doi:10.1063/1.4890341.
@article{osti_1385864,
title = {Mechanical behaviors and phase transition of Ho 2 O 3 nanocrystals under high pressure},
author = {Yan, Xiaozhi and Ren, Xiangting and He, Duanwei and Chen, Bin and Yang, Wenge},
abstractNote = {Mechanical properties and phase transition often show quite large crystal size dependent behavior, especially at nanoscale under high pressure. Here, we have investigated Ho2O3 nanocrystals with in-situ x-ray diffraction and Raman spectroscopy under high pressure up to 33.5 GPa. When compared to the structural transition routine cubic -> monoclinic -> hexagonal phase in bulk Ho2O3 under high pressure, the nano-sized Ho2O3 shows a much higher onset transition pressure from cubic to monoclinic structure and followed by a pressure-induced-amorphization under compression. The detailed analysis on the Q (Q = 2π/d) dependent bulk moduli reveals the nanosized Ho2O3 particles consist of a clear higher compressible shell and a less compressible core. Insight into these phenomena shed lights on micro-mechanism studies of the mechanical behavior and phase evolution for nanomaterials under high pressure, in general.},
doi = {10.1063/1.4890341},
journal = {Journal of Applied Physics},
number = 3,
volume = 116,
place = {United States},
year = {Mon Jul 21 00:00:00 EDT 2014},
month = {Mon Jul 21 00:00:00 EDT 2014}
}