About this Abstract |
Meeting |
MS&T21: Materials Science & Technology
|
Symposium
|
Advanced Materials for Harsh Environments
|
Presentation Title |
Electrical, Microstructural and Thermomechanical Properties of Doped-LaCrO3 Ceramics for High Temperature Electronics and Sensing Applications |
Author(s) |
Javier A. Mena, Edward M Sabolsky, Katarzyna Sabolsky, Konstantinos A Sierros, Kavin Sivaneri Varadharajan Idhaiam |
On-Site Speaker (Planned) |
Javier A. Mena |
Abstract Scope |
Important electrical and sensor applications require stable conductors under temperatures up to 1500°C in various redox environments. High temperature conductors such as nitrides and carbides are not stable under oxidizing atmospheres. Therefore, low redox materials can be a more attractive alternative. In this work, careful dopant studies of the LaCrO3 system were performed in order to control the electronic and ionic conductivity, as well as the relative chemical and microstructural stability. Neodymium and Niobium dopants were initially studied to control p-type, and potentially n-type conductive mechanisms, respectively, while other dopants were also investigated. The electrical conductivity and Seebeck coefficient were characterized up to 1500°C under varying oxygen partial pressures. The phase and microstructural evolution were also investigated by XRD and SEM. The materials exhibiting acceptable electrical and thermomechanical performance were printed within thick films sensors. Results may hold the key for developing new generation of high temperature sensing materials. |