Structure and magnetic properties of impurity complexes [NiF4F4Fint] 6- (C4v) in the BaF2 crystal: EPR study data

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Аннотация

Impurity paramagnetic complexes [NiF4F4Fint]6-(C4v), which are a stable associate of a trivalent nickel ion with an interstitial fluorine ion Fint, have been synthesized in a fluorite structure BaF2 ionic crystals. The molecular structure of the synthesized complexes was studied by the method of electron paramagnetic resonance at frequencies of 9.39 and 34.25 GHz in the temperature range from 5 to 250 K. It is shown that in the studied complex, the Ni3+ ion (3d74FS = 3/2) replaced the lattice cation Ba2+, but, under the influence of Fint in the neighboring internode of the octahedral type, shifted towards it from the center of the coordination cube occupied by it. Under the influence of the tetragonal symmetry crystal field, the electron spin levels of the complex split into two Kramers doublets |±1/2⟩, of which the doublet turned out to be the main one. The energy interval between doublets is approximately 114 GHz. A super-superfine structure is observed in the EPR spectra due to the interactions of the electron spin moment of the nickel ion with the nuclei of nine ligand fluorine ions. The parameters of these interactions are defined.

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Авторлар туралы

V. Ulanov

Zavoisky Physical-Technical Institute, Federal Research Center “Kazan Scientific Center of the Russian Academy of Sciences”; Kazan State Power Engineering University

Хат алмасуға жауапты Автор.
Email: ulvlad@inbox.ru

Zavoisky Physical-Technical Institute

Ресей, Kazan; Kazan

I. Yatsyk

Zavoisky Physical-Technical Institute, Federal Research Center “Kazan Scientific Center of the Russian Academy of Sciences”

Email: ulvlad@inbox.ru

Zavoisky Physical-Technical Institute

Ресей, Kazan

R. Zaripov

Zavoisky Physical-Technical Institute, Federal Research Center “Kazan Scientific Center of the Russian Academy of Sciences”

Email: ulvlad@inbox.ru

Zavoisky Physical-Technical Institute

Ресей, Kazan

R. Zainullin

Kazan State Power Engineering University

Email: ulvlad@inbox.ru
Ресей, Kazan

V. Golenishchev-Kutuzov

Kazan State Power Engineering University

Email: ulvlad@inbox.ru
Ресей, Kazan

Әдебиет тізімі

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1. JATS XML
2. Fig. 1. The second derivative of the EPR spectrum of parallel oriented centers of the first type in the BaF2:Ni(H0ǁ<110>, T = 20 K) crystal.

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3. Fig. 2. The second derivative of the EPR spectrum of perpendicularly oriented centers of the first type in the BaF2:Ni(H0ǁ<110>, T = 20 K) crystal.

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4. Fig. 3. The second derivative of the EPR spectrum of perpendicularly oriented centers of the first type in the BaF2:Ni(H0ǁ<110>, T = 20 K) crystal.

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5. Fig. 4. Model of the molecular structure of the paramagnetic complex [NiF4F4Fint]6-(C4v) in the BaF2 crystal.

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