Nanoindentation initiated dislocations in barium titanate (BaTiO3)

Abstract

Articles you may be interested inNanoindentation-induced plastic deformation and fracture behavior difference between a -and c -domains of BaTiO 3 single crystal J. Appl. Phys.Plastic behavior during loading of ferroelectric bulk materials is commonly explained by domain switching processes. In this study the authors show that dislocation induced deformation also occurs during nanoindentation of BaTiO 3 . Studies were conducted using a spheroconical shaped indenter together with observations using atomic force microscopy ͑AFM͒ and focussed ion beam cross sections for transmission electron microscopy ͑TEM͒ of the contact areas. Force/displacement measurements showed the sudden appearance of "pop-in" events, which AFM/TEM observations revealed were associated with plastic deformation and dislocation arrays at the surface. TEM cross sections of the indents showed paired parallel slip lines with 45°to the original surface.

Determining Activation Volume for the Pressure‐Induced Phase Transformation in β‐Eucryptite Through Nanoindentation

“…Previous nanoindentation studies on different ceramics 32,[59][60][61][62] attributed the pop-in behavior to homogeneous dislocation nucleation because the maximum shear stresses in the experiments were far greater than the theoretical strength of the ceramic (~1.5-4 τ th ). As the magnitude of the maximum shear stresses in the present study is smaller than the theoretical strength of b-eucryptite, homogeneous dislocation nucleation likely does not occur.…”

Nanoindentation-induced plastic deformation and fracture behavior difference between a- and c-domains of BaTiO3 single crystal

“…The PFM image in Fig. 8 Therefore, to present both the cracks and 90°ac-domain structure simultaneously, the deflection image is used in this study. As shown in Fig.…”

“…[6][7][8][9] Moreover, as the size of a ferroelectric device shrinks to the micro-and nanoscales, the mechanical properties and fracture behavior of individual domains become more and more critical for their practical function and reliability. In these applications, the material experiences combined mechanical and electrical loadings.…”

Spherical indentation with multiple partial unloading for assessing the mechanical properties of ZrB2–SiC composites

“…It is well known that the initiation of dislocation motion always results in initiation of fracture in ceramics owing to their limited slip systems, and therefore dislocation-based macroscopic accumulation of large-scale plasticity at room temperature is limited in ceramics [13]. Recently, Ghosh et al [14] observed the existence of slip lines produced by indentation and scratch tests and manifested that dislocation mobility occurs in ZrB 2 .…”