期刊
SYMMETRY-BASEL
卷 13, 期 6, 页码 -出版社
MDPI
DOI: 10.3390/sym13060977
关键词
boron arsenate; cristobalite; auxetic; negative linear compressibility; Poisson's ratio; shear
资金
- Malta Council for Science Technology [RI-2017-033-T]
- National Science Centre, Poland [2017/27/B/ST3/02955]
The study focuses on the deformations of boron arsenate crystals under shear loading, using density functional theory simulations to investigate the auxetic properties in the (001) plane and deformations caused by shear loading.
Boron arsenate, BAsO4, is crystalline material (I4 over bar group) that was recently shown to be auxetic in its (001) plane for loading in any direction in this plane, and, which exhibits negative linear compressibility at elevated pressured in its [001] direction. This work presents and discusses the results of extensive density functional theory (DFT) based simulations aimed at studying deformations that such crystals undergo when subjected to shear loading in an attempt to obtain a better insight into the manner in which this material responds to mechanical loads. The deformations for shearing in the (001) plane are described in terms of the 'rotating squares' model, which was used to explain the auxeticity in the same plane where it was shown that shear loading results primarily in deformations which make the 'squares' become 'parallelogram-like' rather than rotate. This lack of rigidity in projected 'squares' was discussed by looking at changes in bond lengths and bond angles.
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