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Effects of high-temperature ambient on cyclic fatigue of La0.8Sr0.2MnO3+δ

Published online by Cambridge University Press:  15 August 2011

Makoto Tanaka ,
Tsuneaki Matsudaira ,
Daisuke Igimi  and
Satoshi Kitaoka
Makoto Tanaka*
Affiliation:
Japan Fine Ceramics Center, Atsuta-ku, Nagoya 456-8587, Japan
Tsuneaki Matsudaira
Affiliation:
Japan Fine Ceramics Center, Atsuta-ku, Nagoya 456-8587, Japan
Daisuke Igimi
Affiliation:
Japan Fine Ceramics Center, Atsuta-ku, Nagoya 456-8587, Japan
Satoshi Kitaoka
Affiliation:
Japan Fine Ceramics Center, Atsuta-ku, Nagoya 456-8587, Japan
*
a)Address all correspondence to this author. e-mail: m_tanaka@jfcc.or.jp
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Abstract

The effects of water vapor and oxygen on the cyclic fatigue behavior of oxygen-excess La0.8Sr0.2MnO3+δ (LSM) were investigated under three-point bending at 1273 K. Because the fatigue life did not obviously depend on the number of cycles, which also represented the effective time of the applied stress, the fracture was presumed to not be significantly controlled by stress-corrosion cracking. Under a low oxygen partial pressure (), however, wet exposure inhibited both fatigue fracture and permanent deformation, in which the LSM crystal lattice was distorted and the unit cell free volume was reduced. Under a high , on the contrary, the crystal symmetry was increased by the wet exposure. The inhibition of fatigue fracture and deformation at both high and low was probably caused by retardation of lanthanum diffusion through its vacancies.

Keywords

CeramicFatigueCrystallographic structure
Type
Articles
Information
Journal of Materials Research , Volume 26 , Issue 18 , 28 September 2011 , pp. 2450 - 2457
Copyright
Copyright © Materials Research Society 2011

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