Comparison of mode-resolved fracture strength of silicon with mixed-mode failure of diamond crystals

• Verfasst von: Kozhushko, Victor [VerfasserIn]
• Verfasst von: Hess, Peter [VerfasserIn]
• Titel: Comparison of mode-resolved fracture strength of silicon with mixed-mode failure of diamond crystals
• Verf.angabe: Victor V. Kozhushko, Peter Hess
• Jahr: 2010
• Umfang: 8 S.
• Fussnoten: Online veröffentlicht am 5. April 2009 ; Gesehen am 23.03.2023
• Titel Quelle: Enthalten in: Engineering fracture mechanics
• Ort Quelle: Kidlington : Elsevier Science, 1968
• Jahr Quelle: 2010
• Band/Heft Quelle: 77(2010), 2 vom: Jan., Seite 193-200
• DOI: doi:10.1016/j.engfracmech.2009.03.015
• Datenträger: Online-Ressource
• Sprache: eng
• Sach-SW: Diamond
• Sach-SW: Fracture strength
• Sach-SW: Mixed-mode fracture
• Sach-SW: Nonlinear surface acoustic waves
• Sach-SW: Silicon
• K10plus-PPN: 183986690X

Abstract

Currently ab initio theory provides the ideal tensile and shear strength of the {111} cleavage plane in single-crystal silicon and diamond only for few selected planes and directions (‘geometries’). These values can be compared with the real strength of nano-, micro-, and single-crystalline devices to roughly judge their mechanical quality. A novel contact-free and notch-free optical laser method allows the measurement of the fracture strength with plane nonlinear surface acoustic waves (SAWs), providing a unique way to discriminate between tensile and shear stresses for well-defined crystallographic planes and directions in anisotropic materials. Calibration yields the critical fracture stress or strength for the geometries, which can be compared with theory. In the case of diamond mostly mechanistically unresolved mixed-mode failure has been studied for complex geometries. Nevertheless, the comparison of these critical failure stresses with the strength of the ideal lattice and the mode- and geometry-resolved fracture behavior of silicon provides new insight into the mechanical stability and failure behavior of diamond materials.