Reactivity of manganites in 18O isotope exchange reactions

I. A. Koudriashov; G. N. Mazo; I. K. Murwani; S. Scheurell; E. Kemnitz

doi:10.1023/A:1010124100944

Reactivity of manganites in ¹⁸O isotope exchange reactions

I. A. Koudriashov^*, G. N. Mazo, I. K. Murwani, S. Scheurell, E. Kemnitz

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

7 Citations (Scopus)

Abstract

The effect of the structural properties and the oxidation state of MN on the ¹⁸O isotope exchange behaviour of ternary manganites (La_1-xSr_xMnO₃, La_0.5Sr_1.5MnO₄ and SrMnO₃) has been studied. All types of ¹⁸O isotope exchange (homomolecular, partially and completely heteromolecular) take place on the very active manganites with perovskite (LaMnO³ and La^0.7Sr_0.3MnO₃) and perovskite-like (SrMnO₃) structure, but not on the less active K₂NiF₄-structure (La_0.5Sr_1.5MnO₄). The highest ¹⁸O exchange activity is observed for La_0.7Sr_0.3MnO₃, for which the completely heteromolecular ¹⁸O exchange starts to occur at 520 K, already, a T_on which is typical for excellent redox catalysts. The influence of the structural properties on the ¹⁸O exchange and oxygen diffusion behaviour of the manganites is much more pronounced than that of the Mn³⁺/Mn⁴⁺ ratio. The different reduction behaviour of the manganites with perovskite and K₂NiF₄-structure can be explained by means of the bond-valence model.

Original language	English
Pages (from-to)	59-68
Number of pages	10
Journal	Journal of Thermal Analysis and Calorimetry
Volume	63
Issue number	1
DOIs	https://doi.org/10.1023/A:1010124100944
Publication status	Published - 2001
Externally published	Yes

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title = "Reactivity of manganites in 18O isotope exchange reactions",

abstract = "The effect of the structural properties and the oxidation state of MN on the 18O isotope exchange behaviour of ternary manganites (La1-xSrxMnO3, La0.5Sr1.5MnO4 and SrMnO3) has been studied. All types of 18O isotope exchange (homomolecular, partially and completely heteromolecular) take place on the very active manganites with perovskite (LaMnO3 and La0.7Sr0.3MnO3) and perovskite-like (SrMnO3) structure, but not on the less active K2NiF4-structure (La0.5Sr1.5MnO4). The highest 18O exchange activity is observed for La0.7Sr0.3MnO3, for which the completely heteromolecular 18O exchange starts to occur at 520 K, already, a Ton which is typical for excellent redox catalysts. The influence of the structural properties on the 18O exchange and oxygen diffusion behaviour of the manganites is much more pronounced than that of the Mn3+/Mn4+ ratio. The different reduction behaviour of the manganites with perovskite and K2NiF4-structure can be explained by means of the bond-valence model.",

author = "Koudriashov, {I. A.} and Mazo, {G. N.} and Murwani, {I. K.} and S. Scheurell and E. Kemnitz",

note = "Funding Information: The financial support of the Deutscher Akademischer Austauschdienst (DAAD), the Deutsche For-schungsgemeinschaft (DFG) and the Ministry of Science and Technology of Russian Federation (grants RUS 139/97) is gratefully acknowledged.",

year = "2001",

doi = "10.1023/A:1010124100944",

language = "English",

volume = "63",

pages = "59--68",

journal = "Journal of Thermal Analysis and Calorimetry",

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T1 - Reactivity of manganites in 18O isotope exchange reactions

AU - Koudriashov, I. A.

AU - Mazo, G. N.

AU - Murwani, I. K.

AU - Scheurell, S.

AU - Kemnitz, E.

N1 - Funding Information: The financial support of the Deutscher Akademischer Austauschdienst (DAAD), the Deutsche For-schungsgemeinschaft (DFG) and the Ministry of Science and Technology of Russian Federation (grants RUS 139/97) is gratefully acknowledged.

PY - 2001

Y1 - 2001

N2 - The effect of the structural properties and the oxidation state of MN on the 18O isotope exchange behaviour of ternary manganites (La1-xSrxMnO3, La0.5Sr1.5MnO4 and SrMnO3) has been studied. All types of 18O isotope exchange (homomolecular, partially and completely heteromolecular) take place on the very active manganites with perovskite (LaMnO3 and La0.7Sr0.3MnO3) and perovskite-like (SrMnO3) structure, but not on the less active K2NiF4-structure (La0.5Sr1.5MnO4). The highest 18O exchange activity is observed for La0.7Sr0.3MnO3, for which the completely heteromolecular 18O exchange starts to occur at 520 K, already, a Ton which is typical for excellent redox catalysts. The influence of the structural properties on the 18O exchange and oxygen diffusion behaviour of the manganites is much more pronounced than that of the Mn3+/Mn4+ ratio. The different reduction behaviour of the manganites with perovskite and K2NiF4-structure can be explained by means of the bond-valence model.

AB - The effect of the structural properties and the oxidation state of MN on the 18O isotope exchange behaviour of ternary manganites (La1-xSrxMnO3, La0.5Sr1.5MnO4 and SrMnO3) has been studied. All types of 18O isotope exchange (homomolecular, partially and completely heteromolecular) take place on the very active manganites with perovskite (LaMnO3 and La0.7Sr0.3MnO3) and perovskite-like (SrMnO3) structure, but not on the less active K2NiF4-structure (La0.5Sr1.5MnO4). The highest 18O exchange activity is observed for La0.7Sr0.3MnO3, for which the completely heteromolecular 18O exchange starts to occur at 520 K, already, a Ton which is typical for excellent redox catalysts. The influence of the structural properties on the 18O exchange and oxygen diffusion behaviour of the manganites is much more pronounced than that of the Mn3+/Mn4+ ratio. The different reduction behaviour of the manganites with perovskite and K2NiF4-structure can be explained by means of the bond-valence model.

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JO - Journal of Thermal Analysis and Calorimetry

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Reactivity of manganites in ¹⁸O isotope exchange reactions

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