Non-congruence of high-temperature mechanical and structural behaviors of LaCoO3 based perovskites
Abstract
Our paper presents the mechanical behavior of LaCoO3 and La0.8Ca0.2CoO3 ceramics under four-point bending in which the two cobaltites are subjected to a low stress of ~8 MPa at temperatures ranging from room temperature to 1000 °C. Unexpected stiffening is observed in pure LaCoO3 in the 700–900 °C temperature range, leading to a significant increase in the measured Young’s modulus, whereas La0.8Ca0.2CoO3 exhibits softening from 100 °C to 1000 °C, as expected for most materials upon heating. we use neutron diffraction, X-ray diffraction and micro-Raman spectroscopy to study the crystal structure of the two materials in the RT–1000 °C temperature range. Despite a detailed study, there is no conclusive evidence to explain the stiffening behavior observed in pure LaCoO3 as opposed to the softening behavior in La0.8Ca0.2CoO3 at high temperatures (above 500 °C).
- Authors:
-
- Univ. of Central Florida, Orlando, FL (United States). Dept. of Mechanical and Aerospace Engineering
- (ORNL), Oak Ridge, TN (United States). Chemical Engineering Materials Division
- (Ukraine)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Chemical Engineering Materials Division
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Quantum Condensed Matter Division
- Univ. of London (United Kingdom). School of Engineering and Materials Science
- Swiss Federal Laboratories for Materials Science and Technology, Duebendorf (Switzerland)
- Publication Date:
- Research Org.:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
- OSTI Identifier:
- 1341565
- Alternate Identifier(s):
- OSTI ID: 1460428
- Grant/Contract Number:
- AC05-00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of the European Ceramic Society
- Additional Journal Information:
- Journal Volume: 37; Journal Issue: 4; Journal ID: ISSN 0955-2219
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; Lanthanum cobaltite; Powder diffraction; Raman spectroscopy; Young’s modulus; Temperature dependence; Hysteresis
Citation Formats
Aman, Amjad, Jordan, Ryan, Chen, Yan, Oak Ridge National Lab., Stadelmann, Richard, Lugovy, Mykola, Inst. for Problems of Materials Science, Kiev, Orlovskaya, Nina, Payzant, E. Andrew, dela Cruz, Clarina, Reece, Michael J., Graule, Thomas, and Kuebler, Jakob. Non-congruence of high-temperature mechanical and structural behaviors of LaCoO3 based perovskites. United States: N. p., 2016.
Web. doi:10.1016/j.jeurceramsoc.2016.11.005.
Aman, Amjad, Jordan, Ryan, Chen, Yan, Oak Ridge National Lab., Stadelmann, Richard, Lugovy, Mykola, Inst. for Problems of Materials Science, Kiev, Orlovskaya, Nina, Payzant, E. Andrew, dela Cruz, Clarina, Reece, Michael J., Graule, Thomas, & Kuebler, Jakob. Non-congruence of high-temperature mechanical and structural behaviors of LaCoO3 based perovskites. United States. https://doi.org/10.1016/j.jeurceramsoc.2016.11.005
Aman, Amjad, Jordan, Ryan, Chen, Yan, Oak Ridge National Lab., Stadelmann, Richard, Lugovy, Mykola, Inst. for Problems of Materials Science, Kiev, Orlovskaya, Nina, Payzant, E. Andrew, dela Cruz, Clarina, Reece, Michael J., Graule, Thomas, and Kuebler, Jakob. Tue .
"Non-congruence of high-temperature mechanical and structural behaviors of LaCoO3 based perovskites". United States. https://doi.org/10.1016/j.jeurceramsoc.2016.11.005. https://www.osti.gov/servlets/purl/1341565.
@article{osti_1341565,
title = {Non-congruence of high-temperature mechanical and structural behaviors of LaCoO3 based perovskites},
author = {Aman, Amjad and Jordan, Ryan and Chen, Yan and Oak Ridge National Lab. and Stadelmann, Richard and Lugovy, Mykola and Inst. for Problems of Materials Science, Kiev and Orlovskaya, Nina and Payzant, E. Andrew and dela Cruz, Clarina and Reece, Michael J. and Graule, Thomas and Kuebler, Jakob},
abstractNote = {Our paper presents the mechanical behavior of LaCoO3 and La0.8Ca0.2CoO3 ceramics under four-point bending in which the two cobaltites are subjected to a low stress of ~8 MPa at temperatures ranging from room temperature to 1000 °C. Unexpected stiffening is observed in pure LaCoO3 in the 700–900 °C temperature range, leading to a significant increase in the measured Young’s modulus, whereas La0.8Ca0.2CoO3 exhibits softening from 100 °C to 1000 °C, as expected for most materials upon heating. we use neutron diffraction, X-ray diffraction and micro-Raman spectroscopy to study the crystal structure of the two materials in the RT–1000 °C temperature range. Despite a detailed study, there is no conclusive evidence to explain the stiffening behavior observed in pure LaCoO3 as opposed to the softening behavior in La0.8Ca0.2CoO3 at high temperatures (above 500 °C).},
doi = {10.1016/j.jeurceramsoc.2016.11.005},
journal = {Journal of the European Ceramic Society},
number = 4,
volume = 37,
place = {United States},
year = {Tue Nov 29 00:00:00 EST 2016},
month = {Tue Nov 29 00:00:00 EST 2016}
}
Web of Science
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Works referencing / citing this record:
Time and frequency dependent mechanical properties of LaCoO 3 -based perovskites: Neutron diffraction and domain mobility
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