Millimeter-wave characterization of aluminum substituted barium lead hexaferrite single crystals grown from PbO–B2O3 flux

Винник, Д.А.; Ustinova, I. A.; Устинов, А. Б.; Gudkova, S.A.; Жеребцов, Д. А.; Trofimov, Evgeny; Zabeivorota, N.S.; Михайлов, Г. Г.; Niewa, Rainer

doi:10.1016/j.ceramint.2017.08.145

Cited by 21 publications

(7 citation statements)

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“…Основными факторами, объясняющими возможность широкого применения гексаферритов в магнитооптике, устройствах СВЧ, акустоэлектронике, являются высокие значения их твердости, температуры Кюри, коэрцитивной силы, показатели химической инертности [44]. В работах [139,140] было показано, что гексаферриты, в состав которых входит более одного элемента, замещающего железо, могут отличаться частотой ферромагнитного резонанса и пропускной способностью. Таким образом, варьируя состав материала, можно плавно изменять уровень отмеченных выше свойств.…”

Section: назначение высокоэнтропийных сплавовunclassified

Review of alloys developed using the entropy approach

Bataeva¹,

Ruktuev²,

Иванов³

et al. 2021

Metal Working and Material Science

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This paper provides a review of studies on the development and characterization of high-entropy alloys (HEAs). It is structured in the following way. Alloys’ design strategy based on entropy approach. Expectations and modern perceptions. This section describes the initial principles of multicomponent alloys design which provide stable structure and mechanical properties. It is noted that the role of high mixing entropy in the formation of disordered solid solutions and the suppression of the brittle intermetallic phases formation have been significantly reconsidered over time. Currently, obtaining a single-phase solid solution structure is not the main requirement for HEAs. The composition of HEAs. This section describes some typical multicomponent alloys having different elemental compositions. It is shown, that at present time the most studied alloys are based on 3-d transition elements. Using alloys of this group the possibility of providing both high and low values of strength and ductility is shown. Fabrication methods of HEAs. This section describes the methods for the fabrication of high-entropy alloys. It is noted that the most commonly used methods are based on the melting of the initial materials and its subsequent crystallization. Such methods of HEAs fabrication as powder metallurgy, magnetron sputtering, self-propagating high-temperature synthesis, melt spinning, and diffusion welding are also discussed. Structure of HEAs. This section provides the data on HEAs possessing multiphase structure and containing fine nanosized precipitates. Besides, the studies in which HEAs have been obtained in the form of metallic glasses, carbides, oxides, and borides are reviewed. The factors that can affect the structural state of the multicomponent alloys are discussed. The ambiguity of opinions of different research groups is noted. Properties of HEAs. This section mainly concentrates on the mechanical properties of HEAs. However, some other promising properties of HEAs like high wear resistance and reduced diffusivity are also discussed. Plastic deformation of HEAs. This section describes the evolution of the structure and properties of HEAs caused by thermal and mechanical processing. Characterization methods of HEAs. This section lists the characterization techniques, which are most frequently used to study HEAs. The structure of these alloys is mainly studied by scanning electron microscopy, transmission electron microscopy, energy-dispersive X-ray spectroscopy, and optical microscopy. The methods for properties measurements are also briefly reviewed. Application of HEAs. This section describes the promising fields of HEAs application. It can be utilized in the aerospace, aircraft, and nuclear industries as well as for car manufacturing, austoelectronics, and in the design of microwave devices. Russian-language publications on HEAs. This section lists the studies, published in the Russian language as well as the thesis, done in Russian universities.

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Section: назначение высокоэнтропийных сплавовunclassified

Review of alloys developed using the entropy approach

Bataeva¹,

Ruktuev²,

Иванов³

et al. 2021

Metal Working and Material Science

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“…Обзор проведенных к настоящему времени экспериментальных работ по получению монокристаллов замещённых гексаферритов показывает, что наибольших успехов в этом направлении удалось добиться [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21], используя методику их выращивания из высокотемпературных растворов с использованием растворителей Bi2O3, BaB2O4, Na2O и NaFeO2 методом спонтанной кристаллизации.…”

Section: методика проведения экспериментовunclassified

Analysis of the Experimental Production Possibility of Polysubstituted Crystals with M-type Hexaferrite Structure

2019

RIJIE

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Проведён анализ экспериментальных работ по получению замещённых монокристаллов со структурой гексаферрита М-типа, результаты которого демонстрируют возможность достижения достаточно высоких степеней замещения даже для случаев использования одного заместителя атомов железа. Результаты анализа позволяют рассчитывать на то, что увеличение числа заместителей, которое будет сопровождаться увеличением энтропии смешения и, как следствие, уменьшением энергии Гиббса твёрдорастворной фазы, будет способствовать стабилизации структур с ещё большей степенью замещения. В ходе экспериментальных работ по получению образцов многокомпонентных (высокоэнтропийных) кристаллов со структурой гексаферрита Мтипа могут быть использованы описанные в тексте статьи приёмы, методики и оборудование, которые ранее были использованы для получения монокристаллов BaFe12-хМехO19 с одним заместителем атомов железа. Ключевые слова: гексаферриты М-типа, высокоэнтропийные фазы, эксперимнетальное исследование, замещение атомов железа в кристаллической структуре, оборудование и методики.

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“…M-type hexaferrites with space group P6 3 /mmc have found applications in various fields of technology as hard magnetic materials for permanent magnets and magnetic composites, information storage devices, and magneto-optical devices [1,2]. The growth of doped hexaferrite single crystals and study of their properties was the subject of many works in our laboratory [3][4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Flux Single Crystal Growth of BaFe12−xTixO19 with Titanium Gradient

et al. 2020

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Titanium substituted barium hexaferrite BaFe12−xTixO19 single crystal was grown by the top seeded solution growth method from flux on the seed with controlled cooling below 1175 °C. Titanium substitution level gradient in the single crystal in the vertical and horizontal directions was studied. Two planes were cut and polished. A justification for the linear gradient of Ti substitution in a BaFe12−xTixO19 single crystal is proposed; substitution levels in the center and periphery were determined. It was shown that upon growth by the top seeded solution growth method, crystals with a linear Ti substitution level gradient from x = 0.73 to x = 0.77 for a distance of 11 mm along pulling direction were obtained. The study led to the conclusion about the relationship of the gradient and changes in the composition of the nutrient solution.

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Millimeter-wave characterization of aluminum substituted barium lead hexaferrite single crystals grown from PbO–B2O3 flux

Cited by 21 publications

References 50 publications

Review of alloys developed using the entropy approach

Review of alloys developed using the entropy approach

Analysis of the Experimental Production Possibility of Polysubstituted Crystals with M-type Hexaferrite Structure

Flux Single Crystal Growth of BaFe12−xTixO19 with Titanium Gradient

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