Phase equilibria and crystal chemistry of the CaO–½Sm2O3–CoOz system at 885 °C in air
Abstract
The CaO–½Sm2O3–CoOz system prepared at 885 °C in air consists of two calcium cobaltate compounds, namely, the 2D thermoelectric oxide solid solution, (Ca3$$-$$xSmx)Co4O9$$-$$z (0 ≤ x ≤ 0.5) which has a misfit layered structure, and the 1D Ca3Co2O6 which consists of chains of alternating CoO6 trigonal prisms and CoO6 octahedra. Ca3Co2O6 was found to be a point compound without the substitution of Sm on the Ca site. A solid solution region of distorted perovskite, (Sm1$$-$$xCax)CoO3$$-$$z (0 ≤ x ≤ 0.22, space group Pnma) was established. The reported Sm2CoO4 phase was not observed at 885 °C, but a ternary Ca-doped oxide, (Sm1+xCa1$$-$$x)CoO4$$-$$z (Bmab) where 0 < x ≤ 0.15 was found to be stable at this temperature. In the peripheral binary systems, Sm was not present in the Ca site of CaO, while a small solid solution region was identified for (Sm1$$-$$xCax)O(3$$-$$z)/2 (0 ≤ x ≤ 0.075). Lastly, ten solid solution tie-line regions and six three-phase regions were determined in the CaO–½Sm2O3–CoOz system in air.
- Authors:
-
- National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States)
- Univ. of Maryland, College Park, MD (United States). Dept. of Chemistry and Biochemistry
- Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
- Illinois Inst. of Technology, Chicago, IL (United States)
- Publication Date:
- Research Org.:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1245143
- Alternate Identifier(s):
- OSTI ID: 1251268
- Grant/Contract Number:
- AC02-06CH11357
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Solid State Sciences
- Additional Journal Information:
- Journal Volume: 48; Journal Issue: C; Journal ID: ISSN 1293-2558
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; Phase diagram of CaO-½Sm2O3-CoOz; structure for (Sm1-xCax)2O3-z, and (Sm1+xCa1-x)CoO4-z; thermoelectric oxide system; tie-line phase relationships
Citation Formats
Wong-Ng, W., Laws, W., Lapidus, S. H., and Kaduk, J. A. Phase equilibria and crystal chemistry of the CaO–½Sm2O3–CoOz system at 885 °C in air. United States: N. p., 2015.
Web. doi:10.1016/j.solidstatesciences.2015.06.003.
Wong-Ng, W., Laws, W., Lapidus, S. H., & Kaduk, J. A. Phase equilibria and crystal chemistry of the CaO–½Sm2O3–CoOz system at 885 °C in air. United States. https://doi.org/10.1016/j.solidstatesciences.2015.06.003
Wong-Ng, W., Laws, W., Lapidus, S. H., and Kaduk, J. A. Sat .
"Phase equilibria and crystal chemistry of the CaO–½Sm2O3–CoOz system at 885 °C in air". United States. https://doi.org/10.1016/j.solidstatesciences.2015.06.003. https://www.osti.gov/servlets/purl/1245143.
@article{osti_1245143,
title = {Phase equilibria and crystal chemistry of the CaO–½Sm2O3–CoOz system at 885 °C in air},
author = {Wong-Ng, W. and Laws, W. and Lapidus, S. H. and Kaduk, J. A.},
abstractNote = {The CaO–½Sm2O3–CoOz system prepared at 885 °C in air consists of two calcium cobaltate compounds, namely, the 2D thermoelectric oxide solid solution, (Ca3$-$xSmx)Co4O9$-$z (0 ≤ x ≤ 0.5) which has a misfit layered structure, and the 1D Ca3Co2O6 which consists of chains of alternating CoO6 trigonal prisms and CoO6 octahedra. Ca3Co2O6 was found to be a point compound without the substitution of Sm on the Ca site. A solid solution region of distorted perovskite, (Sm1$-$xCax)CoO3$-$z (0 ≤ x ≤ 0.22, space group Pnma) was established. The reported Sm2CoO4 phase was not observed at 885 °C, but a ternary Ca-doped oxide, (Sm1+xCa1$-$x)CoO4$-$z (Bmab) where 0 < x ≤ 0.15 was found to be stable at this temperature. In the peripheral binary systems, Sm was not present in the Ca site of CaO, while a small solid solution region was identified for (Sm1$-$xCax)O(3$-$z)/2 (0 ≤ x ≤ 0.075). Lastly, ten solid solution tie-line regions and six three-phase regions were determined in the CaO–½Sm2O3–CoOz system in air.},
doi = {10.1016/j.solidstatesciences.2015.06.003},
journal = {Solid State Sciences},
number = C,
volume = 48,
place = {United States},
year = {Sat Jun 27 00:00:00 EDT 2015},
month = {Sat Jun 27 00:00:00 EDT 2015}
}
Web of Science