Rapid sintering protocol produces dense ceria-based ceramics

Nimrod Yavo; Asaf Nissenbaum; Ellen Wachtel; Tal El Shaul; Orit Mendelson; Giora Kimmel; Sangtae Kim; Igor Lubomirsky; Ori Yeheskel

doi:10.1111/jace.15743

Rapid sintering protocol produces dense ceria-based ceramics

Nimrod Yavo, Asaf Nissenbaum, Ellen Wachtel, Tal El Shaul, Orit Mendelson, Giora Kimmel, Sangtae Kim, Igor Lubomirsky, Ori Yeheskel

Weizmann Institute of Science, Israel

Research output: Contribution to journal › Article › peer-review

5 Citations (Scopus)

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/T₁. 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	https://doi.org/10.1111/jace.15743
Publication status	Published - Nov 2018

Keywords

ceramics
ceria
nanometric powder
pores
sintering

ASJC Scopus subject areas

Ceramics and Composites
Materials Chemistry

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@article{fc6b3583e1424d5483f3b78dc97a7185,

title = "Rapid sintering protocol produces dense ceria-based ceramics",

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/T1. By avoiding extended exposure to sintering temperatures, this protocol is expected to minimize undesirable Gd segregation.",

keywords = "ceramics, ceria, nanometric powder, pores, sintering",

author = "Nimrod Yavo and Asaf Nissenbaum and Ellen Wachtel and Shaul, {Tal El} and Orit Mendelson and Giora Kimmel and Sangtae Kim and Igor Lubomirsky and Ori Yeheskel",

note = "Funding Information: 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. Funding Information: 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.",

year = "2018",

month = nov,

doi = "10.1111/jace.15743",

language = "English",

volume = "101",

pages = "4968--4975",

journal = "Journal of the American Ceramic Society",

issn = "0002-7820",

publisher = "Wiley-Blackwell",

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T1 - Rapid sintering protocol produces dense ceria-based ceramics

AU - Yavo, Nimrod

AU - Nissenbaum, Asaf

AU - Wachtel, Ellen

AU - Shaul, Tal El

AU - Mendelson, Orit

AU - Kimmel, Giora

AU - Kim, Sangtae

AU - Lubomirsky, Igor

AU - Yeheskel, Ori

N1 - Funding Information: 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. Funding Information: 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.

PY - 2018/11

Y1 - 2018/11

N2 - 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/T1. By avoiding extended exposure to sintering temperatures, this protocol is expected to minimize undesirable Gd segregation.

AB - 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/T1. By avoiding extended exposure to sintering temperatures, this protocol is expected to minimize undesirable Gd segregation.

KW - ceramics

KW - ceria

KW - nanometric powder

KW - pores

KW - sintering

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DO - 10.1111/jace.15743

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JO - Journal of the American Ceramic Society

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