Atomic origins of solid helium bubbles in tungsten

doi:10.1088/1674-1056/23/12/127806

Abstract

Solid helium bubbles were directly observed in the helium ion implanted tungsten (W), by different transmission electron microscopy (TEM) techniques at room temperature. The diameters of these solid helium bubbles range from 1 nm to 8 nm in diameter with the mean bubble size about 3 nm. The selected area electron diffraction (SAED) and fast Fourier transform (FFT) images revealed that solid helium bubbles possess body-centered cubic (bcc) structure with a lattice constant of 0.447 nm. High-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) images further confirmed the existence of helium bubble in tungsten. The present findings provide an atomic level view of the microstructure evolution of helium in the materials, and revealed the existence of solid helium bubbles in materials.

Keywords: solid helium bubble atomic origins tungsten TEM HAADF-STEM

Received: 12 November 2014
Accepted manuscript online:

PACS:	78.70-g
	78.90.-g
	78.90.+t	(Other topics in optical properties, condensed matter spectroscopy and other interactions of particles and radiation with condensed matter)
	21.90.+f	(Other topics in nuclear structure)

Fund:

Project supported by the ITER-National Magnetic Confinement Fusion Program (Grant Nos. 2010GB109000, 2011GB108009, and 2014GB123000) and the National Natural Science Foundation of China (Grant No. 11075119).

Corresponding Authors: Xia Min, Ge Chang-Chun
E-mail: xmdsg@126.com;ccge@mater.ustb.edu.cn

Cite this article:

Xia Min (夏敏), Guo Hong-Yan (郭洪燕), Dai Yong (戴勇), Yan Qing-Zhi (燕青芝), Guo Li-Ping (郭立平), Li Tie-Cheng (李铁成), Qiao Yi (乔祎), Ge Chang-Chun (葛昌纯) Atomic origins of solid helium bubbles in tungsten 2014 Chin. Phys. B 23 127806


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