Scavenging effect on ionic conduction behaviour at the grain boundary of MgO partially stabilised zirconia

作者：Kim B; Jeon S; Erauw J P; Lee H^*

来源：Advances in Applied Ceramics, 2016, 135(4): 200-203.

DOI：10.1080/17436753.2015.1116819

• Magnesia partially stabilised zirconia (Mg-PSZ)
• Stabilisation
• Scavenging effect
• Grain boundary resistance
• Intergranular phase

The scavenging effect of magnesium oxide (MgO) addition on electrical property of 9 mol-% MgO partially stabilised zirconia (Mg-PSZ) was investigated in terms of phase transformation and intergranular phase formation. The addition of MgO up to 5 mol-% caused a stabilisation of Mg-PSZ, which led to an increase in the cubic phase and a decrease in the monoclinic and tetragonal phases in Mg-PSZ. The Mg-PSZ with the addition of 5 mol-% of MgO also exhibited the maximum ionic conductivity (0.3915Scm(-1) at 1500 degrees C) and forsterite (Mg2SiO4) was observed on the grain boundaries of Mg-PSZ. The intergranular phases, formed by reactions between the silicon in Mg-PSZ and MgO addition, reduced the grain boundary resistance, because the siliceous phase which is a hindrance for oxygen ion conduction was scavenged by the formation of Mg2SiO4.

• 出版日期2016-5