Mechanical behaviors and phase transition of Ho{sub 2}O{sub 3} nanocrystals under high pressure

Yan, Xiaozhi; Ren, Xiangting; He, Duanwei; Chen, Bin; Yang, Wenge

doi:10.1063/1.4890341

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

Journal Article · Mon Jul 21 00:00:00 EDT 2014 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4890341· OSTI ID:22308911

Yan, Xiaozhi ^[1]; Ren, Xiangting ^[1]; He, Duanwei ^[1]; Chen, Bin ^[2]; Yang, Wenge ^[2]

Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065 (China)
Center for High Pressure Science and Technology Advanced Research (HPSTAR), 1690 Cailun Rd., Pudong, Shanghai 201203 (China)

Mechanical properties and phase transition often show quite large crystal size dependent behavior, especially at nanoscale under high pressure. Here, we have investigated Ho{sub 2}O{sub 3} 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 Ho{sub 2}O{sub 3} under high pressure, the nano-sized Ho{sub 2}O{sub 3} 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 Ho{sub 2}O{sub 3} 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.

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OSTI ID:: 22308911

Journal Information:: Journal of Applied Physics, Vol. 116, Issue 3; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979

Country of Publication:: United States

Language:: English

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