A thermodynamic model of cavitynucleation and growth in ion-implanted single-crystal BaTiO3 layer is proposed, and cavity formation is related to the measured mechanical properties to better understand hydrogen implantation-induced layer transfer processes for ferroelectric thin films. The critical radius for cavitynucleation was determined experimentally from blistering experiments performed under isochronal anneal conditions and was calculated using continuum mechanical models for deformation and fracture, together with thermodynamic models. Based on thermodynamic modeling, we suggest that cavitiesgrow toward the cracking criteria at a critical blister size whereupon gas is emitted from ruptured cavities. The main driving force for layer splitting is the reduction of the overall elastic energy stored in the implanted region during the cavitynucleation and growth as the gaseous H2 entrapped within the cavities is released. Nanoindentation measurements reveal locally the mechanical property changes within the vicinity of a single cavity. Using the measured mechanical properties at the single-cavity level, we developed three-dimensional strain and stress profiles using finite element method.
Published in Journal of Applied Physics, Volume 97, Issue 7, 2005, pages #074311-.
©Journal of Applied Physics 2005, American Institute of Physics.
Park, Y-B., Nardi, P., Li, X., & Atwater, H. A. (1 April 2005). Nanomechanical Characterization of Cavity Growth and Rupture in Hydrogen-Implanted Single-Crystal BaTiO3. Journal of Applied Physics, 97 (7), #074311. http://dx.doi.org/10.1063/1.1885183