Scavenging effect on ionic conduction behaviour at the grain boundary of MgO partially stabilised zirconia. (18th May 2016)

• Record Type: Journal Article
• Authors: Kim, B.; Jeon, S.; Erauw, J. P.; Lee, H.
• Is Part Of: Advances in applied ceramics. Volume 115:Number 4(2016)
• Page Start: 200
• Page End: 203
• Publication Date: 2016-05-18
• Subjects: Magnesia partially stabilised zirconia (Mg-PSZ) -- Stabilisation -- Scavenging effect -- Grain boundary resistance -- Intergranular phase; Ceramics -- Periodicals; 620.1405
• DOI: 10.1080/17436753.2015.1116819
• Languages: English
• ISSNs: 1743-6753

Abstract

Abstract : 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 (0.3915 S cm −1 at 1500°C) and forsterite (Mg2 SiO4 ) 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 Mg2 SiO4 .