Phase formation and iron oxidation states in SrFe(Al)O3−δ perovskites
Mossbauer spectroscopy, total conductivity measurements and XRD were used to evaluate phase formation and Fe oxidation and coordination states in the Sr(Fe1-xAlx)O3-delta system. A solid-solution range of cubic perovskite (ABO3) with random B-cation distribution forms in the approximate limits x = 0...
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| Veröffentlicht in: | Materials letters 2005-06, Vol.59 (13), p.1644-1648 |
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| creator | Waerenborgh, J C Rojas, D P Shaula, A L Mather, G C Patrakeev, M V Kharton, V V Frade, J R |
| description | Mossbauer spectroscopy, total conductivity measurements and XRD were used to evaluate phase formation and Fe oxidation and coordination states in the Sr(Fe1-xAlx)O3-delta system. A solid-solution range of cubic perovskite (ABO3) with random B-cation distribution forms in the approximate limits x = 0-0.35. The Fe3+/Fe ratio increases with increasing Al concentration fomenting a B-O network with isolated Fe4+ species, resulting in p-type electronic conductivity via a hopping mechanism. The activation energy for hole transport, 28-30 kJ/mol at 300-700 K in air, exhibits little variation with x. Thermal expansion coefficients, (13.5-16.4) x 10 exp(-6)/K at 373-923 K and (18.6-31.9) x 10 exp(-6)/K at 923-1273 K, decrease with increasing Al content and oxygen nonstoichiometry. 18 refs. |
| doi_str_mv | 10.1016/j.matlet.2005.01.033 |
| format | Article |
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Thermal expansion coefficients, (13.5-16.4) x 10 exp(-6)/K at 373-923 K and (18.6-31.9) x 10 exp(-6)/K at 923-1273 K, decrease with increasing Al content and oxygen nonstoichiometry. 18 refs.</description><identifier>ISSN: 0167-577X</identifier><identifier>DOI: 10.1016/j.matlet.2005.01.033</identifier><language>eng</language><ispartof>Materials letters, 2005-06, Vol.59 (13), p.1644-1648</ispartof><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c344t-38cb697a4841bd9b7201a42ebe123b44752002a42361cb729f42a502c6303773</citedby><cites>FETCH-LOGICAL-c344t-38cb697a4841bd9b7201a42ebe123b44752002a42361cb729f42a502c6303773</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,776,780,27901,27902</link.rule.ids></links><search><creatorcontrib>Waerenborgh, J C</creatorcontrib><creatorcontrib>Rojas, D P</creatorcontrib><creatorcontrib>Shaula, A L</creatorcontrib><creatorcontrib>Mather, G C</creatorcontrib><creatorcontrib>Patrakeev, M V</creatorcontrib><creatorcontrib>Kharton, V V</creatorcontrib><creatorcontrib>Frade, J R</creatorcontrib><title>Phase formation and iron oxidation states in SrFe(Al)O3−δ perovskites</title><title>Materials letters</title><description>Mossbauer spectroscopy, total conductivity measurements and XRD were used to evaluate phase formation and Fe oxidation and coordination states in the Sr(Fe1-xAlx)O3-delta system. 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| title | Phase formation and iron oxidation states in SrFe(Al)O3−δ perovskites |
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