TY - JOUR
T1 - Characterisation of microstructure and hardness of perovskite-structured Ba0.5Sr0.5Co0.8Fe0.2O3 - δ under different sintering conditions
AU - Wang, Li
AU - Dou, Rui
AU - Bai, M.
AU - Li, Yizhe
AU - Hall, David
AU - Chen, Ying
PY - 2016/6
Y1 - 2016/6
N2 - Microstructural evolution of Ba0.5Sr0.5Co0.8Fe0.2O3 − δ (BSCF) has been investigated using commercial powders sintered at different conditions. All the samples, characterised by the porosity P and grain size D, are determined to be a single cubic phase. The grain growth kinetics is evaluated using Dn = tK0exp(−Q/RT). Grain boundary diffusion is the dominant controlling mechanism of densification and the Ba/Sr diffusion is the rate-controlling species. Additionally, the Vickers hardness (HV) of BSCF is measured at ambient condition. The HV is successfully described by an exponential function of porosity, HV = H0exp(−bP). The porosity is the dominant factor determining the hardness when it is over 0.06. Otherwise, the Vickers hardness shows a dependence on pore size. Compared with the strong dependence of hardness on porosity, no correlation between hardness and grain size or grain orientation has been found.
AB - Microstructural evolution of Ba0.5Sr0.5Co0.8Fe0.2O3 − δ (BSCF) has been investigated using commercial powders sintered at different conditions. All the samples, characterised by the porosity P and grain size D, are determined to be a single cubic phase. The grain growth kinetics is evaluated using Dn = tK0exp(−Q/RT). Grain boundary diffusion is the dominant controlling mechanism of densification and the Ba/Sr diffusion is the rate-controlling species. Additionally, the Vickers hardness (HV) of BSCF is measured at ambient condition. The HV is successfully described by an exponential function of porosity, HV = H0exp(−bP). The porosity is the dominant factor determining the hardness when it is over 0.06. Otherwise, the Vickers hardness shows a dependence on pore size. Compared with the strong dependence of hardness on porosity, no correlation between hardness and grain size or grain orientation has been found.
KW - Porosity
KW - Hardness
KW - BSCF
KW - Grain growth kinetics
KW - EBSD
UR - http://www.scopus.com/inward/record.url?eid=2-s2.0-84959221644&partnerID=MN8TOARS
U2 - 10.1016/j.jeurceramsoc.2016.02.010
DO - 10.1016/j.jeurceramsoc.2016.02.010
M3 - Article
SN - 0955-2219
VL - 36
SP - 1659
EP - 1667
JO - Journal of the European Ceramic Society
JF - Journal of the European Ceramic Society
IS - 7
ER -