Orientation Dependence of the Thermal Expansion Coefficients of Iron Borate FeBo3 Crystals

We present high-resolution X-ray diffraction measurements of the lattice parameters of iron borate FeBO3. These measurements were performed at room temperature and at various temperatures ranging from 400 up to 600∘C, enabling the determination of the coefficients of thermal expansion (CTE). The three-dimensional (3D) indicatory surface of thermal expansion of FeBO3was constructed in MathCad. It is shown that the orientation dependence of CTE in FeBO3 is spheroid elongated on threefold axis

INVESTIGATION OF THE THERMAL EXPANSION OF IRON BORATE NEAR THE NEEL POINT

The lattice parameters of FeBO3 were investigated by x-ray diffraction in the temperature range 18–300˚C. It is shown that the iron borate has the anomalous thermal expansion along its principal crystallographic axis «c» in the temperature region of the anti-ferromagnetic transition (the Neel point TN = 77˚C).Измерения выполнены в ЦКП «Урал-М» в ИМЕТ УрО РАН

INVESTIGATION OF THE INFLUENCE OF TEMPERATURE ON THE CRYSTALLITE SIZE OF IRON BORATE

By X-ray peak profile analysis, the crystallite size was estimated from Scherrer’s formula. We have also investigated the temperature dependence of crystallite size in FeBO3

Structural Characteristics of Troilite from Ordinary Chondrites of Different Types

The structural parameters of troilite from ordinary chondrites of different types were in-vestigated

FEATURES OF MINERAL COMPOSITION SOME OF ORDINARY CHONDRITES

We studied texture of matrix and metallic inclusions of the Chelyabinsk LL5 and North-west Africa 869 L3-6 meteorites fragments by X-ray diffraction, optical and electron microscopy

MORPHOLOGY OF SULFIDE MINERALS IN SOME ORDINARY CHONDRITES

We studied the morphology and texture of sulfide inclusions of the Chelyabinsk LL5, Northwest Africa 869 L3-6 and Gao-Guenie Н5 meteorites by X-ray diffraction, optical and electron microscopy. The difference in the morphology of sulfides in fragments of meteorites is due to differences in the conditions of their formation.Работа выполнена при поддержке Программы развития ФГАОУ ВО «Крымский федеральный университет имени В.И. Вернадского» на 2015-2024 годы в рамках реализации академической мобильности по проекту ФГАОУ ВО «КФУ им. В.И. Вернадского» «Сеть академической мобильности «Академическая мобильность молодых ученых России – АММУР» в ФГАОУ ВО «Уральский федеральный университет имени первого Президента России Б.Н. Ельцина», а также Министерства образования и науки Российской Федерации (Проекты 5.4825.2017 / 6.7 и 5.3451.2017 / 4.6) и Правительства Российской Федерации, Акт 211, Соглашение № 02.A03.21.0006

Orientation Dependence of the Thermal Expansion Coefficients of Iron Borate FeBo3 Crystals

We present high-resolution X-ray diffraction measurements of the lattice parameters of iron borate FeBO3. These measurements were performed at room temperature and at various temperatures ranging from 400 up to 600∘C, enabling the determination of the coefficients of thermal expansion (CTE). The three-dimensional (3D) indicatorysurface of thermal expansion of FeBO3was constructed in MathCad. It is shown that the orientation dependence of CTE in FeBO3 is spheroid elongated on threefold axis

Iron borate films: Synthesis and characterization

We report the first successful synthesis of iron borate films. FeBO 3 films on GaBO 3 single crystal sub strates have been prepared by a liquid phase epitaxy route. In order to determine optimal crystallization regimes, a series of experiments has been carried out. Electron microscope studies have allowed mon itoring different phases of the film formation. The compositions of the film and of the substrate have been determined by energy dispersive spectroscopy. X ray diffraction analysis has allowed an accurate determination of a mismatch between the lattice parameters of the film and of the substrate. Electron magnetic resonance studies of the FeBO 3 film confirm the existence of magnetic ordering. The values of the effective Dzyaloshinskii field as well as the Néel temperature are in good accordance with those previously determined for FeBO 3 single crystal

STRUCTURAL CHARACTERISTICS OF IRON SULFIDES IN METEORITE CAMPO DEL CIELO

The troilite was found in the sample of Campo del Cielo meteorite. Its structural param-eters and chemical composition were studied by X-ray diffraction, X-ray fluorescence analy-sis.Авторы выражают благодарность Теребижу В.Ю. за предоставленный для исследования образец метеорита. Исследование выполнено при поддержке РФФИ в рамках научного проекта №19-35-50075 мол_нр, а также Акта 211 Правительства Российской Федерации, Соглаше-ние № 02.A03.21.0006