Igor Veremchuk

Helmholtz-Zentrum Dresden-Rossendorf

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Yuri Grin

Max Planck Society

Ulrich Burkhardt

Max Planck Institute for Chemical Physics of Solids

Walter Schnelle

Max Planck Institute for Chemical Physics of Solids

Roman Gumeniuk

TU Bergakademie Freiberg

Yurii Prots

Max Planck Institute for Chemical Physics of Solids

Andreas Leithe‐Jasper

Max Planck Society

Matej Bobnar

Max Planck Society

Denys Makarov

Helmholtz-Zentrum Dresden-Rossendorf

Iryna Antonyshyn

Max Planck Society

N. F. Chaban

Lviv University

Cooperative Institutions

Max Planck Society

TU Dresden

Max Planck Institute for Chemical Physics of Solids

Helmholtz-Zentrum Dresden-Rossendorf

Leibniz Institute for Solid State and Materials Research

Lomonosov Moscow State University

Centre National de la Recherche Scientifique

Lviv University

TU Bergakademie Freiberg

Johannes Gutenberg University Mainz

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Binary Alkali-Metal Silicon Clathrates by Spark Plasma Sintering: Preparation and Characterization

Materials (2016)

Igor Veremchuk Matt Beekman Iryna Antonyshyn Walter Schnelle Michael Baitinger

The binary intermetallic clathrates K8-xSi46 (x = 0.4; 1.2), Rb6.2Si46, Rb11.5Si136 and Cs7.8Si136 were prepared from M₄Si₄ (M = K, Rb, Cs) precursors by spark-plasma route (SPS) and structurally characterized by Rietveld refinement of PXRD data. The clathrate-II phase Rb11.5Si136 was synthesized for the first time. Partial crystallographic site occupancy of the alkali metals, particularly for the smaller Si20 dodecahedra, was found in all compounds. SPS preparation of Na24Si136 with different SPS current polarities and tooling were performed in order to investigate the role of the electric field on clathrate formation. The electrical and thermal transport properties of K7.6Si46 and K6.8Si46 in the temperature range 4-700 K were investigated. Our findings demonstrate that SPS is a novel tool for the synthesis of intermetallic clathrate phases that are not easily accessible by conventional synthesis techniques.

Spark Plasma Sintering

Characterization

SPARK (programming language)

10.3390/ma9070593

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Citations (10)

Mn-for-Fe substitution in Fe1-Mn In2S4 thiospinel – Crystal structure and thermoelectric properties

Journal of Physics and Chemistry of Solids (2021)

Paweł Wyżga Igor Veremchuk Primož Koželj Andreas Leithe‐Jasper Roman Gumeniuk

Rietveld Refinement

10.1016/j.jpcs.2021.109984

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Citations (8)

Discovery of high-performance thermoelectric copper chalcogenide using modified diffusion-couple high-throughput synthesis and automated histogram analysis technique

Energy & Environmental Science (2020)

Tingting Deng Tong Xing Madison K. Brod Ye Sheng Pengfei Qiu

A modified HTP synthesis method and an automated histogram analysis technique are developed to screen the new stable ternary CTS compound Cu₇Sn₃S₁₀.

10.1039/d0ee02209h

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Citations (50)

ChemInform Abstract: Homo- and Heterovalent Substitutions in the New Clathrates I Si30P16Te8-xSexand Si30+xP16-xTe8-xBrx: Synthesis, Crystal Structure, and Thermoelectric Properties.

ChemInform (2013)

Mykola Abramchuk W. Carrillo‐Cabrera Igor Veremchuk N. Oeschler Andrei V. Olenev

Abstract The new title clathrates are synthesized by solid state reaction of stoichiometric mixtures of Si, P, Te, Se, and TeBr 4 (sealed quartz tube, 1173—1373 K, 96—168 h).

10.1002/chin.201306011

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Citations (0)

Al₂Pt für die Sauerstoffentwicklungsreaktion bei der Wasserspaltung: eine Strategie zur Erzeugung von Multifunktionalität in der Elektrokatalyse

Angewandte Chemie (2020)

Iryna Antonyshyn Ana María Barrios Jiménez Olga Sichevych Ulrich Burkhardt Igor Veremchuk

Abstract Die Herstellung von Wasserstoff durch Wasserelektrolyse ist nur möglich, wenn wirksame und stabile Katalysatoren für die Sauerstoffentwicklungsreaktion (Oxygen Evolution Reaction, OER) verfügbar sind. Intermetallische Verbindungen mit genau definierter Kristallstruktur und elektronischen Eigenschaften sowie besonderer chemischer Bindung werden als Vorstufe für neue Werkstoffe vorgeschlagen, die interessante katalytische Eigenschaften aufweisen. Al 2 Pt kristallisiert im Anti‐Fluorit‐Kristallstrukturtyp und zeigt eine stark polare chemische Bindung. Platin ist hierbei katalytisch aktiv und wird auch unter den Bedingungen der Sauerstoffentwicklungsreaktion vergleichsweise wenig aus der Katalysatoroberfläche herausgelöst. Im Folgenden wird die unerwartete Leistungsfähigkeit einer Oberflächen‐Nanokomposit‐Architektur beschrieben, die aus der selbstorganisierten Umwandlung der intermetallischen Vorstufe Al 2 Pt resultiert. Hierbei wird insbesondere das Langzeitverhalten der katalytischen Aktivität und Stabilität unter den Bedingungen der Sauerstoffentwicklungsreaktion untersucht.

10.1002/ange.202005445

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High carrier mobility and ultralow thermal conductivity in the synthetic layered superlattice Sn₄Bi₁₀Se₁₉

Materials Advances (2021)

Ruiming Lu Alan Olvera Trevor P. Bailey Jiefei Fu Xianli Su

Phonon scattering from Bi₂Se₃/SnSe/Bi₂Se₃ interfaces and high carrier mobility within the 2D Bi₂Se₃-layer lead to the coexistence of ultralow lattice thermal conductivity and high electrical conductivity in the Sn₄Bi₁₀Se₁₉ synthetic superlattice.

Electron Mobility

Phonon scattering

10.1039/d0ma00912a

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Citations (10)

Improving thermoelectric performance of indium thiospinel by Se- and Te-substitution

Journal of Materials Chemistry C (2021)

Paweł Wyżga Sven Grimm Valentin Garbe Esteban Zuñiga‐Puelles Cameliu Himcinschi

Substitution of S by Se or Te in the In_2.67S₄ thiospinel was accompanied by an improvement of the charge carrier concentration and a reduction of the effective electron mass, which resulted in the enhancement of the thermoelectric figure of merit ZT.

Substitution (logic)

Figure of Merit

10.1039/d1tc00291k

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Citations (8)

Exploring the structural and magnetic properties of Cu-rich Cu _x Mn_3- _x O₄ spinels for advanced magnetic refrigeration at liquid nitrogen temperatures

IEEE Magnetics Letters (2024)

Abir Hadded Igor Veremchuk Shengqiang Zhou Denys Makarov E. Dhahri

10.1109/lmag.2024.3443745

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Citations (1)

Downscaling Effect on the Superconductivity of Pd₃Bi₂X₂ (X = S or Se) Nanoparticles Prepared by Microwave-Assisted Polyol Synthesis

Inorganic Chemistry (2016)

Maria Roslova L. Opherden Igor Veremchuk Lena Spillecke Holm Kirmse

Pd3Bi2S2 and Pd3Bi2Se2 have been successfully prepared in the form of nanoparticles with diameters of ∼50 nm by microwave-assisted modified polyol synthesis at low temperatures. The composition and morphology of the samples have been studied by means of powder X-ray diffraction as well as electron microscopy methods, including X-ray intensity mapping on the nanoscale. Superconducting properties of the as-prepared samples have been characterized by electrical resistivity measurements down to low temperatures (∼0.2 K). Deviations from the bulk metallic behavior originating from the submicrometer nature of the samples were registered for both phases. A significant critical-field enhancement up to 1.4 T, i.e., 4 times higher than the value of the bulk material, has been revealed for Pd3Bi2Se2. At the same time, the critical temperature is suppressed to 0.7 K from the bulk value of ∼1 K. A superconducting transition at 0.4 K has been observed in nanocrystalline Pd3Bi2S2. Here, a zero-temperature upper critical field of ∼0.5 T has been estimated. Further, spark plasma-sintered Pd3Bi2S2 and Pd3Bi2Se2 samples have been investigated. Their superconducting properties are found to lie between those of the bulk and nanosized samples.

Nanocrystalline material

Critical field

Powder Diffraction

10.1021/acs.inorgchem.6b01326

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Citations (10)

The Er–Ni–B system

Journal of Alloys and Compounds (2003)

N. F. Chaban Igor Veremchuk Yu. B. Kuz’ma

Structure type

Ternary numeral system

Space group

10.1016/j.jallcom.2003.09.015

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Citations (10)