Mechanism of reaction between lanthanum manganite and yttria-stabilized zirconia

Journal Article · Sat Feb 01 04:00:00 EST 1992 · Journal of the American Ceramic Society; (United States)

DOI:https://doi.org/10.1111/j.1151-2916.1992.tb08193.x· OSTI ID:5527139

Taimatsu, H; Wada, K; Kaneko, H ^[1]; Yamamura, H ^[2]

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1. Dept. of Materials Engineering and Applied Chemistry, Akita Univ., Akita 010 (JP)
2. Tsukuba Research Lab., Tosoh Co., Tsukuba 305 (JP)

The reaction of La{sub 1{minus}x}CA{sub x}MnO{sub 3} (YSZ) has been investigated at temperatures ranging from 1300{degrees} to 1425{degrees}C in air. Substitution of Ca for La in LaMnO{sub 3} depresses the reactivity with YSZ. A layer of La{sub 2}Zr{sub 2}O{sub 7} is formed at the La{sub 1{minus}x}Ca{sub x}MNO{sub 3}/(YSZ) interface after an induction period and its formation is accelerated when the Las{sub 1{minus}x}Ca{sub x}MnO{sub 3} phase is porous. The reaction proceeds by unidirectional diffusion of La, Mn, and/or Ca ions, mainly Mn ions, into YSZ. The diffusion coefficients of La and Mn ions in YSZ, which are estimated using a LaMnO{sub 3}/single-crystal YSZ couple, are much lower than that of oxygen ion. In this paper, from the experimental data, a reaction mechanism is proposed.

• OSTI ID: 5527139
• Journal Information: Journal of the American Ceramic Society; (United States), Journal Name: Journal of the American Ceramic Society; (United States) Vol. 75:2; ISSN JACTA; ISSN 0002-7820
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
ALKALINE EARTH METAL COMPOUNDS
ALLOYS
CALCIUM COMPOUNDS
CALCIUM IONS
CALCIUM OXIDES
CHALCOGENIDES
CHARGED PARTICLES
CHEMICAL COMPOSITION
CHEMICAL REACTION KINETICS
CRYSTALS
DATA
DIFFUSION
EXPERIMENTAL DATA
INFORMATION
INTERFACES
IONS
KINETICS
LANTHANUM COMPOUNDS
LANTHANUM IONS
MANGANESE COMPOUNDS
MANGANESE IONS
MANGANESE OXIDES
MONOCRYSTALS
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
RARE EARTH COMPOUNDS
REACTION KINETICS
STABILITY
TEMPERATURE RANGE
TEMPERATURE RANGE 1000-4000 K
TRANSITION ELEMENT COMPOUNDS
YTTRIUM ADDITIONS
YTTRIUM ALLOYS
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES