Origin of the ESR spectrum in the Prussian Blue analogue RbMn[Fe(CN)6]*H2O

Á. Antal; A. Jánossy; L. Forró; E.J.M. Vertelman; Petra Van Koningsbruggen; Paul H.M. Van Loosdrecht

doi:10.1103/PhysRevB.82.014422

Origin of the ESR spectrum in the Prussian Blue analogue RbMn[Fe(CN)₆]*H₂O

Á. Antal, A. Jánossy, L. Forró, E.J.M. Vertelman, Petra Van Koningsbruggen, Paul H.M. Van Loosdrecht

Chemical Engineering & Applied Chemistry

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

Abstract

We present an ESR study at excitation frequencies of 9.4 GHz and 222.4 GHz of powders and single crystals of a Prussian Blue analogue (PBA), RbMn[Fe(CN)6]*H2O in which Fe and Mn undergoes a charge transfer transition between 175 and 300 K. The ESR of PBA powders, also reported by Pregelj et al. (JMMM, 316, E680 (2007)) is assigned to cubic magnetic clusters of Mn2+ ions surrounding Fe(CN)6 vacancies. The clusters are well isolated from the bulk and are superparamagnetic below 50 K. In single crystals various defects with lower symmetry are also observed. Spin-lattice relaxation broadens the bulk ESR beyond observability. This strong spin relaxation is unexpected above the charge transfer transition and is attributed to a mixing of the Mn3+ - Fe2+ state into the prevalent Mn2+ - Fe3+ state.

Original language	English
Article number	014422
Journal	Physical Review B
Volume	82
Issue number	1
DOIs	https://doi.org/10.1103/PhysRevB.82.014422
Publication status	Published - 21 Jul 2010

Bibliographical note

Keywords

electron spin resonance
pPrussian blue analog

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10.1103/PhysRevB.82.014422

Origin of the ESR spectrum in the Prussian Blue analogue
© 2010 The American Physical Society
Accepted author manuscript, 299 KB

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title = "Origin of the ESR spectrum in the Prussian Blue analogue RbMn[Fe(CN)6]*H2O",

abstract = "We present an ESR study at excitation frequencies of 9.4 GHz and 222.4 GHz of powders and single crystals of a Prussian Blue analogue (PBA), RbMn[Fe(CN)6]*H2O in which Fe and Mn undergoes a charge transfer transition between 175 and 300 K. The ESR of PBA powders, also reported by Pregelj et al. (JMMM, 316, E680 (2007)) is assigned to cubic magnetic clusters of Mn2+ ions surrounding Fe(CN)6 vacancies. The clusters are well isolated from the bulk and are superparamagnetic below 50 K. In single crystals various defects with lower symmetry are also observed. Spin-lattice relaxation broadens the bulk ESR beyond observability. This strong spin relaxation is unexpected above the charge transfer transition and is attributed to a mixing of the Mn3+ - Fe2+ state into the prevalent Mn2+ - Fe3+ state.",

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AU - Antal, Á.

AU - Jánossy, A.

AU - Forró, L.

AU - Vertelman, E.J.M.

AU - Van Koningsbruggen, Petra

AU - Van Loosdrecht, Paul H.M.

PY - 2010/7/21

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N2 - We present an ESR study at excitation frequencies of 9.4 GHz and 222.4 GHz of powders and single crystals of a Prussian Blue analogue (PBA), RbMn[Fe(CN)6]*H2O in which Fe and Mn undergoes a charge transfer transition between 175 and 300 K. The ESR of PBA powders, also reported by Pregelj et al. (JMMM, 316, E680 (2007)) is assigned to cubic magnetic clusters of Mn2+ ions surrounding Fe(CN)6 vacancies. The clusters are well isolated from the bulk and are superparamagnetic below 50 K. In single crystals various defects with lower symmetry are also observed. Spin-lattice relaxation broadens the bulk ESR beyond observability. This strong spin relaxation is unexpected above the charge transfer transition and is attributed to a mixing of the Mn3+ - Fe2+ state into the prevalent Mn2+ - Fe3+ state.

AB - We present an ESR study at excitation frequencies of 9.4 GHz and 222.4 GHz of powders and single crystals of a Prussian Blue analogue (PBA), RbMn[Fe(CN)6]*H2O in which Fe and Mn undergoes a charge transfer transition between 175 and 300 K. The ESR of PBA powders, also reported by Pregelj et al. (JMMM, 316, E680 (2007)) is assigned to cubic magnetic clusters of Mn2+ ions surrounding Fe(CN)6 vacancies. The clusters are well isolated from the bulk and are superparamagnetic below 50 K. In single crystals various defects with lower symmetry are also observed. Spin-lattice relaxation broadens the bulk ESR beyond observability. This strong spin relaxation is unexpected above the charge transfer transition and is attributed to a mixing of the Mn3+ - Fe2+ state into the prevalent Mn2+ - Fe3+ state.

KW - electron spin resonance

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IS - 1

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ER -

Origin of the ESR spectrum in the Prussian Blue analogue RbMn[Fe(CN)₆]*H₂O

Abstract

Bibliographical note

Keywords

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Erratum: Origin of the ESR spectrum in the Prussian blue analog RbMn[Fe(CN)6]·H2O (Physical Review B (2010) 82 014422))

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