Abstract
We report on a rapid sintering protocol, which optimizes the preparation of 0-29 mol% Gd-doped ceria ceramics with density ≥98% of the theoretical crystal lattice value. The starting material is a nanometer grain-sized powder prepared by carbonate co-precipitation and calcined with minimal agglomeration and loss of surface area. Slow (5°C/min) heating of the green-body from 500°C to the optimum temperature of rapid sintering ((Formula presented.), dwell time <1 minute) followed by 20°C/min cooling to 1150°C with 6 minutes dwell time, produces maximum pellet density. (Formula presented.) increases from 1300 to ~1500°C with increase in Gd-content, while the average grain size in the maximally dense pellets, as determined by scanning electron microscopy, ranges between 600 nm and ~1 μm. For each doping level, the logarithm of the average grain size decreases linearly with 1/T 1. By avoiding extended exposure to sintering temperatures, this protocol is expected to minimize undesirable Gd segregation.
| Original language | English |
|---|---|
| Pages (from-to) | 4968-4975 |
| Number of pages | 8 |
| Journal | Journal of the American Ceramic Society |
| Volume | 101 |
| Issue number | 11 |
| DOIs | |
| Publication status | Published - Nov 2018 |
Funding
The authors thank the US–Israel Binational Science Foundation (#2016006) for funding this research. I.L. wishes to acknowledge the assistance of the Nancy and Stephen Grand Research Center for Sensors and Security. The research is also made possible in part by the generosity of the Harold Perlman Family. O.Y. and O.M. gratefully acknowledge the help of Dr. Avi Raveh, R&D Advanced Coating Center, Rotem Ind., for his permission to perform the BET measurements.
All Science Journal Classification (ASJC) codes
- Ceramics and Composites
- Geology
- Geochemistry and Petrology
- Materials Chemistry