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Mechanical Properties of Magnesia‐Doped Lanthanum Chromite versus Temperature
Author(s) -
Montross Charles S.,
Yokokawa Harumi,
Dokiya Masayuki,
Bekessy Lambert
Publication year - 1995
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/j.1151-2916.1995.tb08902.x
Subject(s) - lanthanum , materials science , chromite , orthorhombic crystal system , toughness , magnesium , metallurgy , doping , oxide , analytical chemistry (journal) , composite material , mineralogy , inorganic chemistry , chemistry , crystallography , crystal structure , optoelectronics , chromatography
Magnesia‐doped lanthanum chromite is a potential material for use in solid oxide fuel cells as an interconnector due to its resistance to oxidation and reduction. The strength and toughness of La(Cr 0.9 Mg 0.1 )O 3 were measured from 25° to 1000 deg; C in the as‐fired reduced state and after oxidation. The as‐fired samples showed a peak in toughness of approximately 3.9 MPa.m 1/2 at 125 deg; C which decreased to approximately 1.4 MPa.m 1/2 at 600 deg; C and 2.8 MPa.m 1/2 at room temperature. This peak in toughness is hypothesized to be due to the rhombohedral‐to‐orthorhombic phase transition by a toughening mechanism that is currently being investigated. The strength was also affected by the phase transition for both the as‐fired reduced and the oxidized samples.