Terahertz-infrared dielectric properties of lead-aluminum double-cation substituted single-crystalline barium hexaferrite

Ahmed, A.; Prokhorov, A.S.; Anzin, V.; Vinnik, D.; Ivanov, S.A.; Stash, A.; Chen, Y.S.; Bush, A.; Gorshunov, B.; Alyabyeva, L.

Авторы: Ahmed Asmaa, Prokhorov Anatoly S., Anzin Vladimir, Vinnik Denis, Ivanov Sergey A., Stash Adam, Chen Y.S., Bush Alexander, Gorshunov Boris, Alyabyeva Liudmila
Журнал: Journal of Alloys and Compounds
Год издания: 2022
Издательство: Elsevier BV
Местоположение издательства: Netherlands
Первая страница: 162761
DOI: 10.1016/j.jallcom.2021.162761
Аннотация: Hexaferrite materials are highly demanded to develop and manufacture electronic devices operating at radio- and microwave frequencies. In the light of the prospects for their use in the forthcoming terahertz electronics, here, we present our results on the terahertz and infrared dielectric response of a typical representative of hexaferrites family, lead-substituted M-type barium hexaferrite doped with aluminum, Ba0.2Pb0.8AlxFe12-xO19, x(Al) = 0.0, 3.0, and 3.3. We studied uniquely large and high-quality single crystals of the compounds prepared by spontaneous crystallization growth technique. Our aim was to explore the effect of aluminum substitution on the dielectric response of the compounds. Systematic and detailedvestigations of the dependences of terahertz-infrared (frequencies 8–8000 cm−1) spectra of complexelectric permittivity on the temperature, 4–300 K, and on the chemical composition, x(Al) = 0.0, 1.2, 3.0, and 3.3, were performed for two principal polarizations of the electric field E-vector of the probing radiation relative to the crystallographic c-axis, namely E||c and E⊥c. Furthermore, infrared phonon resonances are recorded and discussed. In contrast to undoped BaFe12O19, no softening of the lowest frequency A2u phonon is observed, indicating suppression of a displacive phase transition in substituted compounds. A number of resonance absorption bands are discovered at terahertz frequencies and assigned to transitions between energy levels of the fine-structured ground state of Fe2+ (5E) ions. The temperature and aluminum-doping dependences of the resonances are analyzed with an account taken of disorder introduced by aluminum. Basing on dielectric data and detailed X-ray experiments, we find that for all concentrations of Al3+ ions, x (Al) = 0.0, 1.2, 3.0, and 3.3, they mainly occupy the 2a and 12k octahedral site positions and that the degree of substitution of iron in tetrahedral positions is not substantial. Along with fundamental findings, the obtained data on broad-band dielectric properties of Ba0.2Pb0.8AlxFe12-xO19 crystals provides the information that can be used for development and manufacture of electronic devices with operating frequencies lying in the terahertz spectral band.
Добавил в систему: Сташ Адам Игаркович

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№	Имя	Описание	Имя файла	Размер	Добавлен
1.	экспертное заключение		ekspertnoe_zaklyuchenie_6251-386_Ahmed_et_al.pdf	1,5 МБ	1 декабря 2021 [adam_stash]
2.	Полный текст		JAC_2021_Tetrahertz-ifrared.pdf	13,7 МБ	30 ноября 2021 [adam_stash]

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