Nanomechanical properties and fracture behaviors of Ba1-xKxCe0.6Zr0.2Y0.2O3-δ electrolytes by nanoindentation

Sheng Rui Jian, Sheng Wei Lee, Jeng Kuei Chang, Chung Jen Tseng, Jenh Yih Juang

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The nanomechanical characteristics and fracture behaviors of the Ba1-xKxCe0.6Zr0.2Y0.2O3-δ (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.

Original languageEnglish
Pages (from-to)1691-1696
Number of pages6
JournalScience of Advanced Materials
Issue number8
StatePublished - 2014


  • Fracture toughness
  • Hardness
  • Nanoindentation
  • Scanning electron microscopy
  • Solid oxide fuel cells
  • X-ray diffraction


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