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Title: Microdomain Formation, Oxidation, and Cation Ordering in LaCa 2 Fe 3 O 8+ y

Abstract

The compound LaCa 2 Fe 3 O 8+ y , also known as the Grenier phase, is known to undergo an order–disorder transformation (ODT) at high temperatures and oxidation has been observed when the compound is cooled in air after the ODT. In this study, we have synthesized the Grenier compound in air using traditional solid‐state reactions and investigated the structure and composition before and after the ODT. Thermal analysis showed that the material undergoes an ODT in both oxygen and argon atmospheres with dynamic, temperature dependent, oxidation upon cooling. Results from scanning transmission electron microscopy (STEM) suggest that the Grenier phase has preferential segregation of Ca and La on the two crystallographic A sites before the ODT, but a random distribution above the ODT temperature. Furthermore, STEM images suggest the possibility that oxygen excess may exist in La‐rich regions within microdomains rather than at microdomain boundaries.

Authors:
 [1];  [2];  [3];
  1. Department of Materials Science and Engineering Boise State University 1910 University Dr. Boise Idaho 83725
  2. Fundamental and Computational Sciences Directorate Pacific Northwest National Laboratory 3335 Innovation Boulevard Richland Washington 99354
  3. Department of Materials Science and Engineering Boise State University 1910 University Dr. Boise Idaho 83725, Center for Advanced Energy Studies 995 University Boulevard Idaho Falls Idaho 83401
Publication Date:
Research Org.:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States). Environmental Molecular Sciences Laboratory (EMSL)
Sponsoring Org.:
USDOE
OSTI Identifier:
1295968
Alternate Identifier(s):
OSTI ID: 1221482; OSTI ID: 1295969
Report Number(s):
PNNL-SA-103675
Journal ID: ISSN 0002-7820
Grant/Contract Number:  
AC05-76RL01830
Resource Type:
Published Article
Journal Name:
Journal of the American Ceramic Society
Additional Journal Information:
Journal Name: Journal of the American Ceramic Society Journal Volume: 98 Journal Issue: 7; Journal ID: ISSN 0002-7820
Publisher:
Wiley-Blackwell
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Chemical Imaging; LCF material system; Environmental Molecular Sciences Laboratory

Citation Formats

Price, Patrick M., Browning, Nigel D., Butt, Darryl P., and Davies, ed., P.. Microdomain Formation, Oxidation, and Cation Ordering in LaCa 2 Fe 3 O 8+ y. United States: N. p., 2015. Web. doi:10.1111/jace.13474.
Price, Patrick M., Browning, Nigel D., Butt, Darryl P., & Davies, ed., P.. Microdomain Formation, Oxidation, and Cation Ordering in LaCa 2 Fe 3 O 8+ y. United States. https://doi.org/10.1111/jace.13474
Price, Patrick M., Browning, Nigel D., Butt, Darryl P., and Davies, ed., P.. Mon . "Microdomain Formation, Oxidation, and Cation Ordering in LaCa 2 Fe 3 O 8+ y". United States. https://doi.org/10.1111/jace.13474.
@article{osti_1295968,
title = {Microdomain Formation, Oxidation, and Cation Ordering in LaCa 2 Fe 3 O 8+ y},
author = {Price, Patrick M. and Browning, Nigel D. and Butt, Darryl P. and Davies, ed., P.},
abstractNote = {The compound LaCa 2 Fe 3 O 8+ y , also known as the Grenier phase, is known to undergo an order–disorder transformation (ODT) at high temperatures and oxidation has been observed when the compound is cooled in air after the ODT. In this study, we have synthesized the Grenier compound in air using traditional solid‐state reactions and investigated the structure and composition before and after the ODT. Thermal analysis showed that the material undergoes an ODT in both oxygen and argon atmospheres with dynamic, temperature dependent, oxidation upon cooling. Results from scanning transmission electron microscopy (STEM) suggest that the Grenier phase has preferential segregation of Ca and La on the two crystallographic A sites before the ODT, but a random distribution above the ODT temperature. Furthermore, STEM images suggest the possibility that oxygen excess may exist in La‐rich regions within microdomains rather than at microdomain boundaries.},
doi = {10.1111/jace.13474},
journal = {Journal of the American Ceramic Society},
number = 7,
volume = 98,
place = {United States},
year = {Mon Mar 23 00:00:00 EDT 2015},
month = {Mon Mar 23 00:00:00 EDT 2015}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1111/jace.13474

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Cited by: 6 works
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