title: Express penetration of hydrogen on Mg(10͞13) along the close-packed-planes.
abstract: Metal atoms often locate in energetically favorite close-packed planes, leading to a relatively high penetration barrier for other atoms. Naturally, the penetration would be much easier through non-close-packed planes, i.e. high-index planes. Hydrogen penetration from surface to the bulk (or reversely) across the packed planes is the key step for hydrogen diffusion, thus influences significantly hydrogen sorption behaviors. In this paper, we report a successful synthesis of Mg films in preferential orientations with both close- and non-close-packed planes, i.e. (0001) and a mix of (0001) and (10͞13), by controlling the magnetron sputtering conditions. Experimental investigations confirmed a remarkable decrease in the hydrogen absorption temperature in the Mg (10͞13), down to 392 K from 592 K of the Mg film (0001), determined by the pressure-composition-isothermal (PCI) measurement. The ab initio calculations reveal that non-close-packed Mg(10͞13) slab is advantageous for hydrogen sorption, attributing to the tilted close-packed-planes in the Mg(10͞13) slab.
authors.affiliation: 1] School of Materials Science and Engineering, Key Laboratory of Advanced Energy Storage Materials of Guangdong Province, South China University of Technology, Guangzhou, 510641, People's Republic of China [2] China-Australia Joint Laboratory for Energy & Environmental Materials, South China University of Technology, Guangzhou, 510641, PR China.
authors.forename: Liuzhang
authors.initials: L
authors.lastname: Ouyang
authors.affiliation: 1] School of Materials Science and Engineering, Key Laboratory of Advanced Energy Storage Materials of Guangdong Province, South China University of Technology, Guangzhou, 510641, People's Republic of China [2] Department of Physics, South China University of Technology, Guangzhou 510640, People's Republic of China [3] China-Australia Joint Laboratory for Energy & Environmental Materials, South China University of Technology, Guangzhou, 510641, PR China.
authors.forename: Jiajun
authors.initials: J
authors.lastname: Tang
authors.affiliation: 1] Department of Physics, South China University of Technology, Guangzhou 510640, People's Republic of China [2] China-Australia Joint Laboratory for Energy & Environmental Materials, South China University of Technology, Guangzhou, 510641, PR China.
authors.forename: Yujun
authors.initials: Y
authors.lastname: Zhao
authors.affiliation: 1] School of Materials Science and Engineering, Key Laboratory of Advanced Energy Storage Materials of Guangdong Province, South China University of Technology, Guangzhou, 510641, People's Republic of China [2] China-Australia Joint Laboratory for Energy & Environmental Materials, South China University of Technology, Guangzhou, 510641, PR China.
authors.forename: Hui
authors.initials: H
authors.lastname: Wang
authors.affiliation: School of Biomolecular and Physical Sciences, Griffith University, Nathan, QLD 4111, Australia.
authors.forename: Xiangdong
authors.initials: X
authors.lastname: Yao
authors.affiliation: 1] School of Materials Science and Engineering, Key Laboratory of Advanced Energy Storage Materials of Guangdong Province, South China University of Technology, Guangzhou, 510641, People's Republic of China [2] China-Australia Joint Laboratory for Energy & Environmental Materials, South China University of Technology, Guangzhou, 510641, PR China.
authors.forename: Jiangwen
authors.initials: J
authors.lastname: Liu
authors.affiliation: Materials Engineering and Centre for Microscopy and Microanalysis, The University of Queensland, St. Lucia, QLD 4072, Australia.
authors.forename: Jin
authors.initials: J
authors.lastname: Zou
authors.affiliation: 1] School of Materials Science and Engineering, Key Laboratory of Advanced Energy Storage Materials of Guangdong Province, South China University of Technology, Guangzhou, 510641, People's Republic of China [2] China-Australia Joint Laboratory for Energy & Environmental Materials, South China University of Technology, Guangzhou, 510641, PR China.
authors.forename: Min
authors.initials: M
authors.lastname: Zhu