Structure of the Fe<sup>3+</sup> centre in α‐LiIO<sub>3</sub> investigated with the method of radiofrequency discrete saturation of an EPR line

Bräuer, Andreas; Daraselia, D.; Abramovskaya, T. A.

doi:10.1002/pssb.2220720254

Physica Status Solidi (b)

1975

DOI: 10.1002/pssb.2220720254

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Structure of the Fe³⁺ centre in α‐LiIO₃ investigated with the method of radiofrequency discrete saturation of an EPR line

Andreas Bräuer

D. Daraselia

T. A. Abramovskaya

Abstract: 3+

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Zero‐Field Splitting in Trigonal Symmetry. Cr³⁺ and Fe³⁺ in α‐LiIO₃

Karthe¹

1977

Physica Status Solidi (b)

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The constant of zero-field splitting l3: of Cr3+ in a-LiIO, is calculated employing the methods of Rimmer and Johnston and Macfarlane. The lattice sums are determined from the structure of the chromium centre and by the use of the quadrupolar constant of lithium in chromium-doped LiIO,. A good agreement between the theoretically and experimentally determined values of B, O is achieved. The contributions of most mechanisms to the zero-field splitting of S-states investigated so far are calculated for Fe3+ in a-LiIO, by using the above lattice sums because the structure of the centre is quite similar to that of the Cr3+ centre. The theoretically determined value proves to be too small by one order of magnitude. The relativistic mechanism in an overlap model is supposed to contribute to a better agreement.Die Nullfeldaufspaltungskonstante 23: von cr-LiJO,: (21.3' wird nach den Methoden von Rimmer und Johnston und von Macfarlane berechnet. Die Gittersummen werden aus der weitgehend bekannten Struktur des Zentrums und unter Benutzung der Quadrupolkopplungs-Konstante des Li in a-LiJO, : C13+ bestimmt. Die Ubereinstimmung zwischen experimentellem und theoretischem B: ist gut. Da das Fe3+-Zentrum in cr-LiJO, eine sehr ahnliche Struktur besitzt, werden mit den gleichen Gittersummen die Beitrage der meisten bisher untersuchten Mechanismen zur Nullfeldaufspaltung von S-Zustanden dafiir berechnet. Dieser Wert ist eine GroBenordnung zu klein. Es wird angenommen, daB der relativistische Prozell in einem Uberlappungsmodell eine bessere gbereinstimmung bringt.

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Zero‐Field Splitting in Trigonal Symmetry. Cr³⁺ and Fe³⁺ in α‐LiIO₃

Karthe¹

1977

Physica Status Solidi (b)

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Investigation of Superhyperfine Interactions of Mn²⁺ in α‐LiIO₃ and Evaluation of Lithium Quadrupolar Interactions

Daraselia

Bräer

1982

Physica Status Solidi (b)

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The models of two types of paramagnetic centres in manganese-doped LiIO, are determined by means of the radiofrequency discrete saturation method (RFDS) and ENDOR, which measure the superhyperfine interactions of the centres with the neighbouring ?Li nuclei. Manganese is arranged a t lithium sites and charge compensation results from a vacancy a t a lithium site. The measured quadrupolar splitting parameters of the 'Li nuclei are calculated with good agreement in point charge approximation on the basis of the models determined. Die Nodelle Ton zwei Srten paramagnetischer Zentren in mangandotiertem LiIO, werden mit derNethode' der diskreten Radiofrequenzskttigung (RFDS) und ENDOR bestimmt. Diese Xethoden messen die Superhyperfeinwechselwirkung der Zentren mit den benachbsrten 'Li-Kernen. Xangan ist auf Lithiumpltltzen angeordnet. Die Ladungskompensation erfolgt durch eine Lithiumvakanz. Die gemessenen Quadrupolaufspaltungsparameter der 'Li-Kerne werden theoretisch in Pnnktladungsnaherung suf der Basis der ermittelten Modelle mit guter ubereinstimmung berechnet.

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Investigation of the local environment and the superhyperfine interactions of an Fe3+ center in α-LiIO3 by the method of radiofrequency discrete saturation

Daraselia

Abramovskaya

1977

Journal of Magnetic Resonance (1969)

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Structure of the Fe³⁺ centre in α‐LiIO₃ investigated with the method of radiofrequency discrete saturation of an EPR line

Abstract: 3+

Cited by 5 publications

References 4 publications

Zero‐Field Splitting in Trigonal Symmetry. Cr³⁺ and Fe³⁺ in α‐LiIO₃

Zero‐Field Splitting in Trigonal Symmetry. Cr³⁺ and Fe³⁺ in α‐LiIO₃

Investigation of Superhyperfine Interactions of Mn²⁺ in α‐LiIO₃ and Evaluation of Lithium Quadrupolar Interactions

Investigation of the local environment and the superhyperfine interactions of an Fe3+ center in α-LiIO3 by the method of radiofrequency discrete saturation

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Structure of the Fe3+ centre in α‐LiIO3 investigated with the method of radiofrequency discrete saturation of an EPR line

Abstract: 3+

Cited by 5 publications

References 4 publications

Zero‐Field Splitting in Trigonal Symmetry. Cr3+ and Fe3+ in α‐LiIO3

Zero‐Field Splitting in Trigonal Symmetry. Cr3+ and Fe3+ in α‐LiIO3

Investigation of Superhyperfine Interactions of Mn2+ in α‐LiIO3 and Evaluation of Lithium Quadrupolar Interactions

Investigation of the local environment and the superhyperfine interactions of an Fe3+ center in α-LiIO3 by the method of radiofrequency discrete saturation

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Structure of the Fe³⁺ centre in α‐LiIO₃ investigated with the method of radiofrequency discrete saturation of an EPR line

Zero‐Field Splitting in Trigonal Symmetry. Cr³⁺ and Fe³⁺ in α‐LiIO₃

Zero‐Field Splitting in Trigonal Symmetry. Cr³⁺ and Fe³⁺ in α‐LiIO₃

Investigation of Superhyperfine Interactions of Mn²⁺ in α‐LiIO₃ and Evaluation of Lithium Quadrupolar Interactions