EMISSION AND TRANSMISSION MOSSBAUER SPECTROSCOPIC (EMS AND TMS) STUDYOF PEROVSKITE OXIDES, (BA, CA)(FE, CO)O3-DELTA ABSORBED WITH CO2

Authors
NOMURA K HOMONNAY Z VANKO G VERTES A POPPL L NATH A UJIHIRA Y HAYAKAWA T TAKEHIRA K
Citation
K. Nomura et al., EMISSION AND TRANSMISSION MOSSBAUER SPECTROSCOPIC (EMS AND TMS) STUDYOF PEROVSKITE OXIDES, (BA, CA)(FE, CO)O3-DELTA ABSORBED WITH CO2, Hyperfine interactions, 112(1-4), 1998, pp. 7-12
Citations number
5
Categorie Soggetti
Physics, Atomic, Molecular & Chemical","Physics, Nuclear","Physics, Condensed Matter
Journal title
Hyperfine interactions → ACNP
ISSN journal
03043843
Volume
112
Issue
1-4
Year of publication
1998
Pages
7 - 12
Database
ISI
SICI code
0304-3843(1998)112:1-4<7:EATMS(>2.0.ZU;2-G
Abstract
Perovskite oxides, (Ba0.95Ca0.05) (Co1-x,Fe-x) O3-delta, are prominent materials for CO, absorption at high temperature. The substitution of Ba sites with Ca ion, and the mixed valence states of Fe and Co ions due to the formation of oxygen vacancies at high temperatures are effe ctive for CO2 absorption. Especially Co ions are more active for CO ab sorption than Fe ions. These oxides were analyzed by EMS and TMS befor e and after treatment in CO2 atmospheres. The difference between EMS a nd TMS spectra is found to be observed not only due to the oxygen affi nity, but also to the different reactivity of Co and Fe ions in the B site towards CO2.