Pressure-induced transparency of MgO, Al2O3, AlN, and cBN ceramics at room temperature
| Autor: | Zhiwei Wang, Jing Yang, Yi Tian, Yuzhu Su, Xin Li, Qiqi Tang, Duanwei He, Junpu Wang, Li Lei |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
010302 applied physics
Diffraction Materials science Process Chemistry and Technology A diamond 02 engineering and technology 021001 nanoscience & nanotechnology Compression (physics) 01 natural sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Stress (mechanics) visual_art 0103 physical sciences Materials Chemistry Ceramics and Composites visual_art.visual_art_medium Fracture (geology) Turning point Ceramic Transparency (data compression) Composite material 0210 nano-technology |
| Zdroj: | Ceramics International. 47:21077-21082 |
| ISSN: | 0272-8842 |
| DOI: | 10.1016/j.ceramint.2021.04.110 |
| Popis: | The in situ axial X-ray diffraction patterns of four ceramic powder samples (MgO, Al2O3, AlN, and cBN) that were compressed in a diamond anvil cell under uniaxial non-hydrostatic conditions were recorded. The microscopic deviatoric stress as a function of the pressure was determined from the X-ray diffraction peak broadening analysis: the curves increased approximately linearly with the pressure at the initial compression stage and then levelled off under further compression. Pressure-induced transparency was observed in all of the samples under compression, and the pressure at the turning point on the curves of the microscopic deviatoric stress versus pressure corresponded to the pressure at which the samples became transparent. Analysis of the microstructural features of the pressure-induced transparent samples indicated that the compression caused the grains to fracture, and the broken grains bonded with each other. We demonstrated that the ceramics’ pressure-induced transparency was a process during which the grains were squeezed and broken, the pores were close between the grains, and the broken grains were re-bonded under compression. |
| Databáze: | OpenAIRE |
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