title: Pressure-induced amorphization in mayenite (12CaO·7Al2O3).
abstract: We report a joint experimental and theoretical study on high pressure structures of nanoporous mayenite (12CaO·7Al(2)O(3)). A pressure-induced amorphization was identified at ∼13 GPa by in situ high pressure x-ray experiments. The amorphous product can be decompressed to ambient conditions. Ab initio calculations reveal that the anisotropic deformations of empty cages break the crystallographic long-range orders, leading to the formation of high-pressure amorphous state. Furthermore, the deformation routes of empty cages are found fully dependent on their individual locally structural geometry relevant to the distribution of extra-framework oxygen ions.
authors.affiliation: State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, People's Republic of China.
authors.forename: Xinxin
authors.initials: X
authors.lastname: Zhang
authors.forename: Yanchao
authors.initials: Y
authors.lastname: Wang
authors.forename: Hui
authors.initials: H
authors.lastname: Wang
authors.forename: Qiliang
authors.initials: Q
authors.lastname: Cui
authors.forename: Chengxin
authors.initials: C
authors.lastname: Wang
authors.forename: Yanming
authors.initials: Y
authors.lastname: Ma
authors.forename: Guangtian
authors.initials: G
authors.lastname: Zou