Author:
Jiang Yitian,Li Xingxing,Zhang Xingwang,Cheng Yong,Zhang Ling,Dong Hao,Yin Zhigang,Zhang Xin
Abstract
Abstract
We report the absence of auxeticity in CoFe2O4, a magnetic spinel oxide. A CoFe2O4(111) epilayer was grown on the ZnO sacrificial layer, and the in-plane and out-of-plane lattice parameters were precisely determined by X-ray reciprocal space maps. To block the influence from stoichiometry variations, the same CoFe2O4 epilayer was lifted off from the substrate and was used as the reference sample. No auxetic behavior was found, and a positive Poisson ratio of ∼0.32 was obtained. Moreover, the Poisson ratio derived from the compliance coefficients agrees well with our experimental observation.
Funder
National Key Research and Development Program of China
National Natural Science Foundation of China
Natural Science Foundation of Beijing Municipality
Subject
General Physics and Astronomy,Physics and Astronomy (miscellaneous),General Engineering