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Nanomechanical Properties and Fracture

The nanomechanical characteristics and fracture behaviors of the Ba 1−x K x Ce 0.6 Zr 0.2 Y 0.2 O 3−� (K-doped BCZY, 0.0 ≤ x ≤ 0.15) oxides were investigated by using nanoindentation techniques. The BKCZY samples were prepared by the citrate-ethylenediaminetetraacetic acid (EDTA) complexing sol–gel process, followed by uniaxial pressure pressing and sintering at 1600 � C for 4 h. The XRD results indicated that the BKCZY samples occurred predominantly in perovskite-type cubic structures. The hardness and Young’s modulus of BKCZY samples were measured by a Berkovich nanoindenter operated in continuous contact stiffness measurements (CSM) mode. Results indicated that the hardness and Young’s modulus of BKCZY sample decreased substantially with increasing the K doping concentration, presumably due to doping-enhanced grain growth. Furthermore, the SEM observations indicated that Berkovich nanoindentation-induced fracture mode was mostly transgranular and the fracture toughness exhibited a similar doping dependence as that of the hardness and Young’s modulus.