In this work, the relationship between the thermodynamic properties of metal-ceramic interfaces and their electrical contact properties was explored for semiconducting BaTiO3 ceramics. The role of chemical reactivity at the interface was quantified through sessile drop measurements of the work of adhesion (Wad). The interfacial properties were characterized with impedance spectroscopy to quantify contact resistance and capacitance. It was observed that interfaces with a strong chemical interaction between the metal and the oxygen anion in the ceramic showed large Wad and correspondingly low contact resistances. It is believed that an oxygen depleted region near the surface of the BaTiO3 was formed as a result of the strong metal-oxygen interactions and led to a large Wad and an Ohmic contact.
All Science Journal Classification (ASJC) codes
- General Materials Science
- Mechanics of Materials
- Mechanical Engineering