Layered perovskites as 'soft-ceramics'

Geoff Fair; Michael Shemkunas; William Petuskey; Sankar Sambasivan

doi:10.1016/s0955-2219(99)00127-2

Layered perovskites as 'soft-ceramics'

Geoff Fair, Michael Shemkunas, William Petuskey, Sankar Sambasivan

Molecular Sciences, School of (SMS)

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

14 Scopus citations

Abstract

The layered perovskite KCa₂Nb₃O₁₀ is shown to possess large elastic and fracture anisotropies which are explained on the basis of its structure. Its fracture toughness was measured relative to the in-basal and basal-normal directions. Combined with previously determined elastic moduli, the fracture energy release rates and associated anisotropy were determined and discussed in terms of crack deflection characteristics. The general mechanical characteristics of KCa₂Nb₃O₁₀ were discussed relating to what is described as a 'soft' ceramic capable of sustaining considerable mechanical damage. Its high thermal stability, T_m=1464°C, and its oxidation resistance are additional features that make it attractive for high temperature applications. Anecdotal demonstrations of its softness and low damage thresholds are presented, such as might be important for cerarnic-matrix composites or machinable ceramic applications.

Original language	English (US)
Pages (from-to)	2437-2447
Number of pages	11
Journal	Journal of the European Ceramic Society
Volume	19
Issue number	13-14
DOIs	https://doi.org/10.1016/s0955-2219(99)00127-2
State	Published - Oct 1999

Keywords

Anisotropy
KCaNbO
Niobates
Perovskites
Toughness

ASJC Scopus subject areas

Ceramics and Composites
Materials Chemistry

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10.1016/s0955-2219(99)00127-2

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title = "Layered perovskites as 'soft-ceramics'",

abstract = "The layered perovskite KCa2Nb3O10 is shown to possess large elastic and fracture anisotropies which are explained on the basis of its structure. Its fracture toughness was measured relative to the in-basal and basal-normal directions. Combined with previously determined elastic moduli, the fracture energy release rates and associated anisotropy were determined and discussed in terms of crack deflection characteristics. The general mechanical characteristics of KCa2Nb3O10 were discussed relating to what is described as a 'soft' ceramic capable of sustaining considerable mechanical damage. Its high thermal stability, Tm=1464°C, and its oxidation resistance are additional features that make it attractive for high temperature applications. Anecdotal demonstrations of its softness and low damage thresholds are presented, such as might be important for cerarnic-matrix composites or machinable ceramic applications.",

keywords = "Anisotropy, KCaNbO, Niobates, Perovskites, Toughness",

author = "Geoff Fair and Michael Shemkunas and William Petuskey and Sankar Sambasivan",

note = "Funding Information: The authors wish to thank Drs T. A. Parthasarathy, M. Cinibulk and R. J. Kerans (all of the Materials and Manufacturing Directorate, Air Force Research Laboratories, Wright-Patterson AFB), and Professor R. C. Bradt (University of Alabama) for their generous discussions elucidating various aspects of fracture mechanics. Usage of the hot pressing and mechanical testing facilities at Wright-Patterson Air Force Base are also greatly appreciated. Funding from the US Air Force Office of Sponsored Research under award F49620-95-1-0155 is gratefully acknowledged.",

year = "1999",

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doi = "10.1016/s0955-2219(99)00127-2",

language = "English (US)",

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AU - Fair, Geoff

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AU - Petuskey, William

AU - Sambasivan, Sankar

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PY - 1999/10

Y1 - 1999/10

N2 - The layered perovskite KCa2Nb3O10 is shown to possess large elastic and fracture anisotropies which are explained on the basis of its structure. Its fracture toughness was measured relative to the in-basal and basal-normal directions. Combined with previously determined elastic moduli, the fracture energy release rates and associated anisotropy were determined and discussed in terms of crack deflection characteristics. The general mechanical characteristics of KCa2Nb3O10 were discussed relating to what is described as a 'soft' ceramic capable of sustaining considerable mechanical damage. Its high thermal stability, Tm=1464°C, and its oxidation resistance are additional features that make it attractive for high temperature applications. Anecdotal demonstrations of its softness and low damage thresholds are presented, such as might be important for cerarnic-matrix composites or machinable ceramic applications.

AB - The layered perovskite KCa2Nb3O10 is shown to possess large elastic and fracture anisotropies which are explained on the basis of its structure. Its fracture toughness was measured relative to the in-basal and basal-normal directions. Combined with previously determined elastic moduli, the fracture energy release rates and associated anisotropy were determined and discussed in terms of crack deflection characteristics. The general mechanical characteristics of KCa2Nb3O10 were discussed relating to what is described as a 'soft' ceramic capable of sustaining considerable mechanical damage. Its high thermal stability, Tm=1464°C, and its oxidation resistance are additional features that make it attractive for high temperature applications. Anecdotal demonstrations of its softness and low damage thresholds are presented, such as might be important for cerarnic-matrix composites or machinable ceramic applications.

KW - Anisotropy

KW - KCaNbO

KW - Niobates

KW - Perovskites

KW - Toughness

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ER -

Layered perovskites as 'soft-ceramics'

Abstract

Keywords

ASJC Scopus subject areas

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