The indentation-induced pop-in phenomenon and fracture behaviors of GaP(100) single-crystal

Yi Jui Chiu, Sheng Rui Jian*, Jyh Wei Lee, Jenh Yih Juang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


The deformation behaviors and fracture features of GaP(100) single-crystal are investigated by using nano- and micro-scale indentation techniques. The hardness and Young's modulus were measured by nanoindentation using a Berkovich diamond indenter with continuous contact stiffness measurements (CSM) mode and the values obtained were 12.5 ± 1.2 GPa and 152.6 ± 12.8 GPa, respectively. In addition, the characteristic "pop-in" was observed in the loading portion of load-displacement curve, which was caused by the nucleation and/or propagation of dislocations. An energetic estimation methodology on the associated nanoindentation-induced dislocation numbers resulting from the pop-in events was discussed. Furthermore, the Vickers indentation induced fracture patterns of GaP(100) single-crystal were observed and analyzed using optical microscopy. The obtained fracture toughness KC of GaP(100) single-crystal was ~1.7 ± 0.1 MPa·m1/2, which is substantially higher than the KIC values of 0.8 MPa·m1/2 and 1.0 MPa·m1/2 previously reported for of single-crystal and polycrystalline GaP, respectively.

Original languageEnglish
Article number752
Issue number11
StatePublished - Nov 2019


  • Fracture
  • GaP(100) single crystal
  • Nanoindentation
  • Pop-in


Dive into the research topics of 'The indentation-induced pop-in phenomenon and fracture behaviors of GaP(100) single-crystal'. Together they form a unique fingerprint.

Cite this