TY - JOUR
T1 - In-situ transmission electron microscopy study of electric-field-induced grain-boundary cracking in lead zirconate titanate
AU - Tan, Xiaoli
AU - Shang, Jian Ku
N1 - Funding Information:
ACKNOWLEDGEMENTS This study was supported by the Army Research Office through contract DAAH04-96-1-0373. The experimental work was carried out in the Center for Microanalysis of Materials, University of Illinois, which is supported by the US Department of Energy under grant DEFG02-96-ER45439.
PY - 2002/5
Y1 - 2002/5
N2 - The field-driven in-situ transmission electron microscopy (TEM) technique was developed to examine micromechanisms of field-induced cracking in ferroelectric ceramics. The technique was constructed by combining a selectively deposited thin film electrode configuration with a modified hot stage to deliver a required electric voltage to a ferroelectric TEM specimen. Under cyclic electric fields, microcracks were found to initiate from pores at the triple junctions and propagate along the grain-boundary in a lead zirconate titanate (PZT) ceramic. Grain-boundary cavitation and coalescence of microcracks were directly observed for the first time during field-induced fracture of PZT at room temperature. The results suggest that dielectric breakdown of the grain-boundary phase was conducive to grain-boundary cavitation, and the crack growth followed the progressive accumulation of the cavity density with electric cycling.
AB - The field-driven in-situ transmission electron microscopy (TEM) technique was developed to examine micromechanisms of field-induced cracking in ferroelectric ceramics. The technique was constructed by combining a selectively deposited thin film electrode configuration with a modified hot stage to deliver a required electric voltage to a ferroelectric TEM specimen. Under cyclic electric fields, microcracks were found to initiate from pores at the triple junctions and propagate along the grain-boundary in a lead zirconate titanate (PZT) ceramic. Grain-boundary cavitation and coalescence of microcracks were directly observed for the first time during field-induced fracture of PZT at room temperature. The results suggest that dielectric breakdown of the grain-boundary phase was conducive to grain-boundary cavitation, and the crack growth followed the progressive accumulation of the cavity density with electric cycling.
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U2 - 10.1080/01418610208240031
DO - 10.1080/01418610208240031
M3 - Article
AN - SCOPUS:0037141682
VL - 82
SP - 1463
EP - 1478
JO - Philosophical Magazine A: Physics of Condensed Matter, Structure, Defects and Mechanical Properties
JF - Philosophical Magazine A: Physics of Condensed Matter, Structure, Defects and Mechanical Properties
SN - 0141-8610
IS - 8
ER -