Experimental and theoretical investigation of the mechanical characteristics of sillenite compound: Bi12GeO20

Date

2021-11-01

Author

Sürücü, Gökhan
Işık, Mehmet
Gencer, Ayşenur
Hasanlı, Nızamı

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The present study reports the mechanical and elastic characteristics of Bi12GeO20 (BGO) compound by experimental nanoindentation measurements and density functional theory (DFT) calculations. X-ray diffraction pattern of BGO was plotted and revealed diffraction peaks were associated with Miller indices of cubic crystalline structure with lattice constant of a = 10.304 Å. Two- and three-dimensional representations of Young’s modulus, linear compressibility, shear modulus and Poisson’s ratio were presented according to DFT calculations. The calculated elastic constants pointed out the mechanically stable and anisotropic behavior of the BGO. The hardness and Young’s modulus ranges of the BGO calculated from DFT studies were found as 3.7–6.3 GPa and 61.7–98.9 GPa, respectively. Hardness and Young’s modulus of BGO single crystal were also obtained by analyzing force-dependent nanoindentation experimental data. It was observed that hardness and Young’s modulus decrease with increase of load in the low applied loads and then reaches saturation in the high applied loads. This behavior is known as indentation size effect. True hardness value was determined from proportional specimen resistance model as 4.1 GPa. The force independent region presented the Young’s modulus as 114 GPa.

Subject Keywords

Density functional theory , Nanoindentation, Mechanical properties, Bi12GeO20 , Sillenites

URI

https://hdl.handle.net/11511/91057

Journal

JOURNAL OF ALLOYS AND COMPOUNDS

DOI

https://doi.org/10.1016/j.jallcom.2021.160686

Collections

Department of Physics, Article

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Citation Formats

G. Sürücü, M. Işık, A. Gencer, and N. Hasanlı, “Experimental and theoretical investigation of the mechanical characteristics of sillenite compound: Bi12GeO20,” JOURNAL OF ALLOYS AND COMPOUNDS, pp. 160686–160693, 2021, Accessed: 00, 2021. [Online]. Available: https://hdl.handle.net/11511/91057.