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Rapid sintering protocol produces dense ceria‐based ceramics
Author(s) -
Yavo Nimrod,
Nissenbaum Asaf,
Wachtel Ellen,
Shaul TalEl,
Mendelson Orit,
Kimmel Giora,
Kim Sangtae,
Lubomirsky Igor,
Yeheskel Ori
Publication year - 2018
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.15743
Subject(s) - sintering , materials science , dwell time , pellets , calcination , ceramic , grain size , pellet , scanning electron microscope , doping , chemical engineering , grain growth , mineralogy , analytical chemistry (journal) , composite material , catalysis , chromatography , chemistry , optoelectronics , medicine , clinical psychology , biochemistry , engineering
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 ( T 1 opt , dwell time <1 minute) followed by 20°C/min cooling to 1150°C with 6 minutes dwell time, produces maximum pellet density. T 1 opt 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.