Influence of Gd content on the room temperature mechanical properties of Gd-doped ceria

Korobko, Roman; Chen, Chien-Ting; Kim, Sangtae; Cohen, Sidney R.; Wachtel, Ellen; Yavo, Nimrod; Lubomirsky, Igor

doi:10.1016/j.scriptamat.2011.10.027

Cited by 36 publications

(36 citation statements)

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“…Powders of undoped and Gd-doped ceria (0-29 mol% Gd) were prepared by a co-precipitation method similar to that described in Ref. [35] 0.3 mol/L solutions in deionized water (Millipore, 18 MΩÁcm) of the corresponding nitrates of Ce 3+ (Ce(NO 3 ) 3 6H 2 O, purity 99.9%; Strem) and Gd 3+ (Gd(NO 3 ) 3 6H 2 O, purity 99.9%; Strem) were mixed in the ratio required to provide the desired doping level. The mixture was then left under vigorous stirring (max speed, magnetic stirrer) for 30 minutes and then preheated to 50 AE 5°C.…”

Section: Powder Synthesismentioning

confidence: 99%

Rapid sintering protocol produces dense ceria‐based ceramics

et al. 2018

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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 (T1opt, dwell time <1 minute) followed by 20°C/min cooling to 1150°C with 6 minutes dwell time, produces maximum pellet density. T1opt 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.

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Section: Powder Synthesismentioning

confidence: 99%

Rapid sintering protocol produces dense ceria‐based ceramics

et al. 2018

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“…Ceramic samples were prepared by the solid synthesis route as described in the earlier work [3,4]. The surface was polished to optical quality and coated by Al electrodes via magnetron sputtering.…”

Section: Methodsmentioning

confidence: 99%

Electromechanical Measurements Of Gd-Doped Ceria Thin Films By Laser Interferometry

Ушаков¹,

Yavo²,

Mishuk³

et al. 2016

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Highly sensitive laser interferometer was built to measure electromechanical coupling in Gd-doped ceria Ce 0.9 Gd 0.1 O 2− thin films in the frequency range up to 20 kHz. Spurious resonances due to substrate bending were avoided by the special mounting of the film in the center of substrate. Compact design allowed to reach high vertical resolution of about 0.2 pm. Electrostriction coefficient measured in 1 m thick Ce 0.9 Gd 0.1 O 2− film was 4.3×10 −21 m 2 /V 2 and slightly decreased with frequency till the extensional resonance of the substrate at about 20 kHz occurred. As expected, the displacement varied as a square of applied voltage without any sign of saturation. A comparison with ceramics showed much higher electrostriction coefficient in the latter in the same frequency range.

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“…However, the mechanical properties found that the elastic modulus, fracture toughness, and hardness of bulk GDC decreased with increased Gd content [131]. In contrast, Korobko et al found that the elastic modulus of GDC was independent of doping level, but that the magnitude of creep decreased with increasing Gd content [132]. Indeed, studies on the elastic modulus of GDC have found significantly different results depending on the method of measurement [133].…”

Section: Chemical Expansion In Ionically Conductive Ceramicsmentioning

confidence: 99%

Chemomechanics of ionically conductive ceramics for electrical energy conversion and storage

et al. 2014

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Functional materials for energy conversion and storage exhibit strong coupling between electrochemistry and mechanics. For example, ceramics developed as electrodes for both solid oxide fuel cells and batteries exhibit cyclic volumetric expansion upon reversible ion transport. Such chemomechanical coupling is typically far from thermodynamic equilibrium, and thus is challenging to quantify experimentally and computationally. In situ measurements and atomistic simulations are under rapid development to explore how this coupling can be used to potentially improve both device performance and durability. Here, we review the commonalities of coupling between electrochemical and mechanical states in fuel cell and battery materials, illustrating with specific cases the progress in materials processing, in situ characterization, and computational modeling and simulation. We also highlight outstanding questions and opportunities in these applications -both to better understand the limiting mechanisms within the materials and to significantly advance the durability and predictability of device performance required for renewable energy conversion and storage.

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Influence of Gd content on the room temperature mechanical properties of Gd-doped ceria

Cited by 36 publications

References 30 publications

Rapid sintering protocol produces dense ceria‐based ceramics

Rapid sintering protocol produces dense ceria‐based ceramics

Electromechanical Measurements Of Gd-Doped Ceria Thin Films By Laser Interferometry

Chemomechanics of ionically conductive ceramics for electrical energy conversion and storage

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