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Title: High-temperature deformation and defect chemistry of (La{sub 1{minus}x}Sr{sub x}){sub 1{minus}y}MnO{sub 3+{delta}}

Abstract

The creep behavior of (La{sub 1{minus}x}Sr{sub x}){sub t{minus}y}MnO{sub 3+{delta}} has been studied as a function of oxygen partial pressure (P{sub O{sub 2}}) and Sr concentration. Polycrystalline samples (x = 0.1, 0.2, 0.3) were deformed at 1,523 K in constant-crosshead-speed compression tests in various atmospheres (10{sup {minus}2} {le} P{sub O{sub 2}} {le} 10{sup 5} Pa). The material deformed by grain-boundary sliding accommodated by lattice diffusion with some possible cavitation and/or interface reaction control. The defect-chemistry model which is standard in the literature could not explain the dependence of the stress on P{sub O{sub 2}} and the Sr concentration. A modified defect-chemistry model shows that cation vacancies controlled the creep rate at P{sub O{sub 2}} {le} 10{sup 5} Pa for x = 0.3 and at low P{sub O{sub 2}} for x = 0.1 and 0.2, and that oxygen vacancies were rate-controlling at high P{sub O{sub 2}} for x = 0.1 and 0.2.

Authors:
; ;  [1];  [2];  [3]
  1. Argonne National Lab., IL (United States)
  2. Army Research Lab., Adelphi, MD (United States)
  3. Illinois Inst. of Tech., Chicago, IL (United States). Dept. of Mechanical, Materials, and Aerospace Engineering
Publication Date:
Research Org.:
Argonne National Laboratory (ANL), Argonne, IL
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
684397
DOE Contract Number:  
W-31109-ENG-38
Resource Type:
Journal Article
Journal Name:
Acta Materialia
Additional Journal Information:
Journal Volume: 47; Journal Issue: 10; Other Information: PBD: 10 Aug 1999
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CRYSTAL DEFECTS; CREEP; LANTHANUM OXIDES; STRONTIUM OXIDES; MANGANESE OXIDES; OXYGEN; PRESSURE DEPENDENCE; TEMPERATURE RANGE 1000-4000 K; CHEMICAL COMPOSITION; EXPERIMENTAL DATA

Citation Formats

Cook, R.E., Goretta, K.C., Routbort, J.L., Wolfenstine, J., and Nash, P. High-temperature deformation and defect chemistry of (La{sub 1{minus}x}Sr{sub x}){sub 1{minus}y}MnO{sub 3+{delta}}. United States: N. p., 1999. Web. doi:10.1016/S1359-6454(99)00160-3.
Cook, R.E., Goretta, K.C., Routbort, J.L., Wolfenstine, J., & Nash, P. High-temperature deformation and defect chemistry of (La{sub 1{minus}x}Sr{sub x}){sub 1{minus}y}MnO{sub 3+{delta}}. United States. doi:10.1016/S1359-6454(99)00160-3.
Cook, R.E., Goretta, K.C., Routbort, J.L., Wolfenstine, J., and Nash, P. Tue . "High-temperature deformation and defect chemistry of (La{sub 1{minus}x}Sr{sub x}){sub 1{minus}y}MnO{sub 3+{delta}}". United States. doi:10.1016/S1359-6454(99)00160-3.
@article{osti_684397,
title = {High-temperature deformation and defect chemistry of (La{sub 1{minus}x}Sr{sub x}){sub 1{minus}y}MnO{sub 3+{delta}}},
author = {Cook, R.E. and Goretta, K.C. and Routbort, J.L. and Wolfenstine, J. and Nash, P.},
abstractNote = {The creep behavior of (La{sub 1{minus}x}Sr{sub x}){sub t{minus}y}MnO{sub 3+{delta}} has been studied as a function of oxygen partial pressure (P{sub O{sub 2}}) and Sr concentration. Polycrystalline samples (x = 0.1, 0.2, 0.3) were deformed at 1,523 K in constant-crosshead-speed compression tests in various atmospheres (10{sup {minus}2} {le} P{sub O{sub 2}} {le} 10{sup 5} Pa). The material deformed by grain-boundary sliding accommodated by lattice diffusion with some possible cavitation and/or interface reaction control. The defect-chemistry model which is standard in the literature could not explain the dependence of the stress on P{sub O{sub 2}} and the Sr concentration. A modified defect-chemistry model shows that cation vacancies controlled the creep rate at P{sub O{sub 2}} {le} 10{sup 5} Pa for x = 0.3 and at low P{sub O{sub 2}} for x = 0.1 and 0.2, and that oxygen vacancies were rate-controlling at high P{sub O{sub 2}} for x = 0.1 and 0.2.},
doi = {10.1016/S1359-6454(99)00160-3},
journal = {Acta Materialia},
number = 10,
volume = 47,
place = {United States},
year = {1999},
month = {8}
}