A taxonomy of apatite frameworks for the crystal chemical design of fuel cell electrolytes
Abstract
Apatite framework taxonomy succinctly rationalises the crystallographic modifications of this structural family as a function of chemical composition. Taking the neutral apatite [La{sub 8}Sr{sub 2}][(GeO{sub 4}){sub 6}]O{sub 2} as a prototype electrolyte, this classification scheme correctly predicted that 'excess' oxygen in La{sub 9}SrGe{sub 6}O{sub 26.5} is tenanted in the framework as [La{sub 9}Sr][(GeO{sub 4}){sub 5.5}(GeO{sub 5}){sub 0.5}]O{sub 2}, rather than the presumptive tunnel location of [La{sub 9}Sr][(GeO{sub 4}){sub 6}]O{sub 2.5}. The implication of this approach is that in addition to the three known apatite genera-A{sub 10}(BO{sub 3}){sub 6}X{sub 2}, A{sub 10}(BO{sub 4}){sub 6}X{sub 2}, A{sub 10}(BO{sub 5}){sub 6}X{sub 2}-hybrid electrolytes of the types A{sub 10}(BO{sub 3}/BO{sub 4}/BO{sub 5}){sub 6}X{sub 2} can be designed, with potentially superior low-temperature ion conduction, mediated by the introduction of oxygen to the framework reservoir. - Graphical abstract: Apatite framework taxonomy succinctly rationalises the crystallographic modifications of this structural family as a function of chemical composition. Neutron diffraction identified that the excess oxygen in La{sub 9}SrGe{sub 6}O{sub 26.5} is tenanted in the framework as [La{sub 9}Sr][(GeO{sub 4}){sub 5.5}(GeO{sub 5}){sub 0.5}]O{sub 2}. The implication of this approach is that in addition to the three known apatite genera-A{sub 10}(BO{sub 3}){sub 6}X{sub 2}, A{sub 10}(BO{sub 4}){sub 6}X{sub 2}, A{submore »
- Authors:
-
- Nanyang Technological University, School of Materials Science and Engineering, 50 Nanyang Avenue, Singapore 639798 (Singapore)
- Publication Date:
- OSTI Identifier:
- 21128365
- Resource Type:
- Journal Article
- Journal Name:
- Journal of Solid State Chemistry
- Additional Journal Information:
- Journal Volume: 181; Journal Issue: 8; Other Information: DOI: 10.1016/j.jssc.2008.03.028; PII: S0022-4596(08)00155-2; Copyright (c) 2008 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0022-4596
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; APATITES; BORATES; CHEMICAL COMPOSITION; CLASSIFICATION; CRYSTAL STRUCTURE; CRYSTALLOGRAPHY; ELECTROLYTES; FUEL CELLS; GERMANIUM OXIDES; LANTHANUM COMPOUNDS; NEUTRON DIFFRACTION; OXYGEN; STRONTIUM COMPOUNDS
Citation Formats
Pramana, Stevin S, Klooster, Wim T, Institute of Materials Research and Engineering, 3 Research Link, Singapore 117602, and White, Timothy J. A taxonomy of apatite frameworks for the crystal chemical design of fuel cell electrolytes. United States: N. p., 2008.
Web. doi:10.1016/j.jssc.2008.03.028.
Pramana, Stevin S, Klooster, Wim T, Institute of Materials Research and Engineering, 3 Research Link, Singapore 117602, & White, Timothy J. A taxonomy of apatite frameworks for the crystal chemical design of fuel cell electrolytes. United States. https://doi.org/10.1016/j.jssc.2008.03.028
Pramana, Stevin S, Klooster, Wim T, Institute of Materials Research and Engineering, 3 Research Link, Singapore 117602, and White, Timothy J. 2008.
"A taxonomy of apatite frameworks for the crystal chemical design of fuel cell electrolytes". United States. https://doi.org/10.1016/j.jssc.2008.03.028.
@article{osti_21128365,
title = {A taxonomy of apatite frameworks for the crystal chemical design of fuel cell electrolytes},
author = {Pramana, Stevin S and Klooster, Wim T and Institute of Materials Research and Engineering, 3 Research Link, Singapore 117602 and White, Timothy J.},
abstractNote = {Apatite framework taxonomy succinctly rationalises the crystallographic modifications of this structural family as a function of chemical composition. Taking the neutral apatite [La{sub 8}Sr{sub 2}][(GeO{sub 4}){sub 6}]O{sub 2} as a prototype electrolyte, this classification scheme correctly predicted that 'excess' oxygen in La{sub 9}SrGe{sub 6}O{sub 26.5} is tenanted in the framework as [La{sub 9}Sr][(GeO{sub 4}){sub 5.5}(GeO{sub 5}){sub 0.5}]O{sub 2}, rather than the presumptive tunnel location of [La{sub 9}Sr][(GeO{sub 4}){sub 6}]O{sub 2.5}. The implication of this approach is that in addition to the three known apatite genera-A{sub 10}(BO{sub 3}){sub 6}X{sub 2}, A{sub 10}(BO{sub 4}){sub 6}X{sub 2}, A{sub 10}(BO{sub 5}){sub 6}X{sub 2}-hybrid electrolytes of the types A{sub 10}(BO{sub 3}/BO{sub 4}/BO{sub 5}){sub 6}X{sub 2} can be designed, with potentially superior low-temperature ion conduction, mediated by the introduction of oxygen to the framework reservoir. - Graphical abstract: Apatite framework taxonomy succinctly rationalises the crystallographic modifications of this structural family as a function of chemical composition. Neutron diffraction identified that the excess oxygen in La{sub 9}SrGe{sub 6}O{sub 26.5} is tenanted in the framework as [La{sub 9}Sr][(GeO{sub 4}){sub 5.5}(GeO{sub 5}){sub 0.5}]O{sub 2}. The implication of this approach is that in addition to the three known apatite genera-A{sub 10}(BO{sub 3}){sub 6}X{sub 2}, A{sub 10}(BO{sub 4}){sub 6}X{sub 2}, A{sub 10}(BO{sub 5}){sub 6}X{sub 2}-hybrid electrolytes of the types A{sub 10}(BO{sub 3}/BO{sub 4}/BO{sub 5}){sub 6}X{sub 2} can be designed.},
doi = {10.1016/j.jssc.2008.03.028},
url = {https://www.osti.gov/biblio/21128365},
journal = {Journal of Solid State Chemistry},
issn = {0022-4596},
number = 8,
volume = 181,
place = {United States},
year = {Fri Aug 15 00:00:00 EDT 2008},
month = {Fri Aug 15 00:00:00 EDT 2008}
}