С. А. Иванов

Temperature dependent magnetic and structural properties of Al substituted nanostructured hexaferrites with large coercive fields

Pierfrancesco Maltoni, Ravi Kiran Dokala, Prativa Pramanik, Rafael Araujo et autres

We report a comprehensive study of the temperature-dependent structural, magnetic, vibrational, and dielectric properties of Al-substituted M-type hexaferrites SrFe 12-x Al x O 19 . Neutron powder diffraction and Mössbauer spectrometry show that Al 3+ preferentially replaces Fe 3+ at spin-up octahedral …

Giant Bandgap Reduction of Co3TeO6 via Pressure Engineering

Ying Ian Chen, Xiangdong Li, Ke Liu, Q. Su et autres

Double perovskites represent a class of materials with promising fundamental properties and a broad spectrum of potential applications. However, the wide bandgap energy in double perovskites presents a hindrance to further enhancement of their photovoltaic efficiency. In the present study, a high-pressure …

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The Saint

С. А. Иванов

Translated Byzantine lives of saints occupied considerable space in the hagiographic corpus of Rus and medieval Russia. But original (non-translated) vitae differ significantly from their Greek models in several respects: the very causes of their subjects’ sanctity (the Rus corpus emphasises saintly …

Reversible phase transitions of Fe0.8Ni1.8Sb0.4O4 spinel up to 50 GPa

Q. Su, R. Mathieu, С. А. Иванов, Hua-Yun Geng et autres

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Synthesis, Microstructure, and Properties of NaNbO3–LiNbO3 LiF-Doped Ceramics

G. M. Kaleva, Ekaterina Dmitrievna Politova, С. А. Иванов, Alexander V. Mosunov et autres

Abstract Single phase ceramic samples of new compositions (1 − x)NaNbO3 – хLiNbO3 (x = 0; 0.05; 0.10; 0.15), modified with a LiF additive, are prepared through solid state reactions, and their crystal structure, microstructure and dielectric and nonlinear optical properties are …

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Engineering hard ferrite composites by combining nanostructuring and Al3+ Substitution: From nano to dense bulk magnets

Pierfrancesco Maltoni, Gianni Barucca, Bogdan Rutkowski, С. А. Иванов et autres

We have investigated the bottom-up sol-gel synthesis of nanocomposite powders comprising two magnetic phases (hexagonal Sr ferrite and spinel Co ferrite) in order to outline a strategy to obtain permanent magnets with large coercivities via low-cost and scalable syntheses. The correlation between …

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Synthesis, Microstructure, and Dielectric Properties of Modified Ceramics Based on Solid Solutions (K0.5Na0.5)NbO3–SrZrO3

Г. М. Калева, Ekaterina Dmitrievna Politova, С. А. Иванов, Alexander V. Mosunov et autres

Absract —Single-phase ceramic samples of new compositions (1 – x)(K0.5Na0.5)NbO3–xSrZrO3 (x = 0–0.15) modified with the addition of 2 wt % ZnO were obtained via the solid-state synthesis method. Their crystal structures, microstructures, dielectric, and nonlinear optical properties were studied. The modified …

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Labeling a Polydiene Elastomer with a π-Extended Mechanophore with a Facile and Low Temperature Synthetic Route

Alex Cartier, Ombeline Taisne, С. А. Иванов, Julien Caillard et autres

Mechanophores are a class of molecules that undergo changes in their optical properties, following a chemical reaction triggered by a force. Integrated in elastomeric materials, their ability to report molecular damage opens up a new toolbox to tackle diverse problems in polymer …

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Pressure-induced metallization in Pb3Mn7O15

Zixing Wang, Jianbo Zhang, H.K. Song, С. А. Иванов et autres

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Relaxor unveils geometrical frustration

Mikhail V. Talanov, L. A. Avakyan, Vladislav I. Kozlov, С. А. Иванов et autres

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CoTeO 4 – a wide-bandgap material adopting the dirutile structure type

Matthias Weil, Pierfrancesco Maltoni, Rebecca Clulow, A. Rydh et autres

Dirutile-type CoTeO 4 exhibits a bandgap of ∼2.42 eV as determined by optical absorption spectroscopy.

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Transition metal-doped SrTiO 3 : when does a tiny chemical impact have such a great structural response?

Mikhail V. Talanov, Adam I. Stash, С. А. Иванов, Elena S. Zhukova et autres

Weak (2 at%) doping of SrTiO 3 by Mn, Ni and Fe leads to radically different changes in structural and dielectric properties, demonstrating clear signs of pseudo Jahn–Teller effect, the first-order Jahn–Teller effect and defect-induced distortion.

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