Article
Chemistry, Physical
L. L. Bao, H. Yibole, J. Y. Xu, Z. Q. Ou, O. Haschuluu, O. Tegus, N. H. van Dijk, E. Bruck, F. Guillou
Summary: (English Summary:)
This study explores the structural and magnetic phase diagrams of (Fe,Co)(2)(P,Si) compounds, with a focus on the observation range of the hexagonal Fe2P-type structure. It is found that under certain conditions of Si content and Fe substitution for Co, the samples undergo structural distortion and exhibit different crystal structures. Additionally, simultaneous Co substitution for Fe and Si substitution for P helps to observe the hexagonal structure. This study provides guidance for future investigations in determining the desired range of properties for permanent magnetic applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
Fredrik L. Nordstrom, Seyed Sepehr Mohajerani, Brian Linehan, Francesco Ricci
Summary: The phase boundaries and thermodynamic properties of crystal phases in the SA-AA system were studied experimentally. Different crystalline phases and solid solutions were identified, and their physical properties, such as solubility enhancements, were compared to the pure components. The thermodynamic relationships and phase transitions of the system were also analyzed.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Physics, Multidisciplinary
Jong Hyuk Kim, Mi Kyung Kim, Jae Min Hong, Hyun Jun Shin, Ki Won Jeong, Jin Seok Kim, Kyungsun Moon, Nara Lee, Young Jai Choi
Summary: In this study, the magnetic anisotropy of the non-collinear antiferromagnet EuCo2As2 was investigated using torque magnetometry and an easy-plane anisotropic model. The detailed spin configurations that evolve in the presence of rotating magnetic fields were visualized, providing an in-depth understanding of the anisotropic properties of noncollinear-type antiferromagnets.
COMMUNICATIONS PHYSICS
(2023)
Article
Chemistry, Physical
B. Vallet-Simond, S. Giron, L. V. B. Diop, O. Isnard
Summary: The effects of Fe substitution on the structural and magnetic properties of the YCo12-xFexB6 series of compounds were investigated, revealing regular expansion of the unit cell and dramatic changes in magnetic properties upon Fe substitution.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Inorganic & Nuclear
Ryo Sumitani, Daisuke Kuwahara, Tomoyuki Mochida
Summary: Cationic rhodium complexes with 1,5-cyclooctadiene (cod) ligands were synthesized and their solid-state structures, thermal properties, and reactivities were investigated. The phase transitions of these salts resulted in disordered solid-state structures, with an increase in structural disorder as the cation symmetry decreased. FSA salts showed lower crystal symmetry and less cation disorder compared to SbF6 salts. Additionally, thermal stabilities and reactivities of these salts were studied, revealing different reactions upon melting for FSA and SbF6 salts.
INORGANIC CHEMISTRY
(2023)
Article
Materials Science, Multidisciplinary
Ruoshi Jiang, Zi-Jian Lang, Tom Berlijn, Wei Ku
Summary: Carrier density is a key factor in controlling material properties, especially in strongly correlated materials. In correlated semimetals, the carrier density can vary sensitively against weak external controls such as temperature, magnetic field, and pressure. Through simulation, it has been discovered that short-range correlation can reversely modulate the carrier density in semimetals, which opens up new possibilities for functionalizing these materials.
Article
Chemistry, Multidisciplinary
Zheng Zhou, Zheng Wei, Xuelin Yao, Xiao-Ye Wang, Klaus Muellen, Minyoung Jo, Michael Shatruk, Marina A. Petrukhina
Summary: Discotic polycyclic aromatics have been chemically reduced to afford triply reduced HBC-based products, which have been structurally characterized. The presence of potassium ions binding to the central rings of HBC core is confirmed, and the coordination and crystal packing are affected by the bulky substituents. The magnetic properties of the triradical in the solid state have also been investigated.
CRYSTAL GROWTH & DESIGN
(2023)
Article
Nanoscience & Nanotechnology
Jimin Oh, Gun Park, Hongjun Kim, Sujung Kim, Dong Ok Shin, Kwang Man Kim, Hye Ryung Byon, Young-Gi Lee, Seungbum Hong
Summary: In this study, we investigate the relationship between the content of solid electrolytes and irreversible capacity in composite electrodes. We analyze the variations of chemical composition and morphology in the solid electrolyte interphase (SEI) layer on the electrodes using electrochemical strain microscopy (ESM) and X-ray photoelectron spectroscopy (XPS). The results show that the solid electrolyte content affects the thickness of the SEI layer and the chemical distributions of Li and F ions, which in turn affect the Coulombic efficiency.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Materials Science, Ceramics
Nicole Bartek, Vladimir V. Shvartsman, Soma Salamon, Heiko Wende, Doru C. Lupascu
Summary: Lead iron niobate (PFN) is a multiferroic material with properties highly dependent on synthesis conditions. By optimizing calcination and sintering temperatures, ceramics with large polarization and dielectric permittivity can be obtained. Increasing temperatures also affects the ferroelectric phase transition and Ne ' el temperature due to a change in the distribution of Fe3+ and Nb5+ ions.
CERAMICS INTERNATIONAL
(2021)
Article
Physics, Multidisciplinary
H. Huang, S-J Lee, Y. Ikeda, T. Taniguchi, M. Takahama, C-C Kao, M. Fujita, J-S Lee
Summary: The presence of a small concentration of in-plane Fe dopants in La1.87Sr0.13Cu0.99Fe0.01O4 is known to enhance stripelike spin and charge density wave (SDW and CDW) order, suppress the superconducting T-c, and induce highly two-dimensional superconducting correlations, which are argued to be signatures of a new form of superconducting order, the pair density wave (PDW) order. This two-dimensional superconducting fluctuation is strongly associated with the CDW stripe, and the PDW signature appears when the correlation length of the CDW stripe grows over eight times the lattice unit.
PHYSICAL REVIEW LETTERS
(2021)
Article
Materials Science, Multidisciplinary
T. Balcerzak
Summary: In this study, the ground state properties of an atomic dimer with spin S=1 were investigated using the exact diagonalization method. The effects of exchange interaction anisotropy, single-ion anisotropy, and biquadratic exchange interaction were taken into account. The results show that the energy spectrum, biquadratic moment, residual entropy, ground-state phase diagrams, and magnetization curves can be calculated and analyzed using this method.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2022)
Article
Chemistry, Physical
X. Wen, M. Shevchenko, E. Jak
Summary: The phase equilibria of CuO0.5-FeO-SiO2 and FeO-SiO2 slag systems with metallic copper/iron and SiO2 were investigated, revealing liquidus isotherms and miscibility gap shapes. The study provides new data on phase equilibria for thermodynamic modeling improvements in multicomponent slag systems.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
H. Pfau, M. Yi, M. Hashimoto, T. Chen, P-C Dai, Z-X Shen, S-K Mo, D. Lu
Summary: The study investigates the influence of electronic nematicity on quasiparticle coherence in detwinned FeSe using ARPES, finding an anisotropy between dxz and dyz orbitals and a more coherent dxz orbital compared to the dyz orbital. This observation contrasts with earlier predictions and underscores the importance of electronic correlations in describing nematicity.
Article
Physics, Applied
A. Mohammadzadeh, A. Rehman, F. Kargar, S. Rumyantsev, J. M. Smulko, W. Knap, R. K. Lake, A. A. Balandin
Summary: This study focuses on the depinning of nearly commensurate charge-density waves in 1T-TaS2 thin films at room temperature. The depinning process in 1T-TaS2 does not show a noticeable increase in electric current, unlike conventional charge-density-wave materials with quasi-1D crystal structure. The results suggest important implications for potential applications of charge-density wave devices in electronics.
APPLIED PHYSICS LETTERS
(2021)
Review
Chemistry, Multidisciplinary
Anna Krzton-Maziopa
Summary: Intercalated layered iron-based monochalcogenides with organic molecules show potential for fine-tuning their magnetic and electrical properties by controlling doping and organic molecule characteristics. Recent progress in intercalation chemistry has led to the discovery of new hybrid inorganic-organic phases with high superconducting transition temperatures.
FRONTIERS IN CHEMISTRY
(2021)
Article
Chemistry, Inorganic & Nuclear
Tobias Rackl, Dirk Johrendt
SOLID STATE SCIENCES
(2020)
Article
Chemistry, Multidisciplinary
Bettina Rendenbach, Timotheus Hohl, Sascha Harm, Constantin Hoch, Dirk Johrendt
Summary: The study successfully demonstrated the intercalation of organic cations in superconducting iron selenide, resulting in a significant increase in critical temperature. Structural characterization of the intercalated material revealed the intercalation mechanism, validated by theoretical calculations. This synthetic route opens up new possibilities for achieving high-yield intercalations of other organic cations.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2021)
Article
Chemistry, Multidisciplinary
Arthur Haffner, Anna-Katharina Hatz, Otto E. O. Zeman, Constantin Hoch, Bettina V. Lotsch, Dirk Johrendt
Summary: KSi2P3 is a potassium ion conductor with high ionic conductivity, low cost and a large electrochemical window. The crystal structure includes channels for easy movement of potassium ions.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Chemistry, Multidisciplinary
Birgit Fuchs, Dirk Johrendt, Lkhamsuren Bayarjargal, Hubert Huppertz
Summary: CrB4O6N crystallizes in a non-centrosymmetric space group and is the first high-pressure oxonitridoborate. It consists of starlike-shaped entities of four BO3N tetrahedra connected via one common nitrogen atom, and contains a tetrahedral building unit in contrast to other oxonitridoborates.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Multidisciplinary Sciences
Vadim Grinenko, Debarchan Das, Ritu Gupta, Bastian Zinkl, Naoki Kikugawa, Yoshiteru Maeno, Clifford W. Hicks, Hans-Henning Klauss, Manfred Sigrist, Rustem Khasanov
Summary: There is considerable evidence that the superconducting state of Sr2RuO4 breaks time reversal symmetry, with experiments showing that the onset temperature of this symmetry breaking matches the critical temperature. Different order parameters are under consideration, with evidence supporting the hypothesis of a d(xz)+/- id(yz) order parameter. The distinction between symmetry-protected degeneracy and accidental degeneracy of the superconducting order parameter remains challenging in Sr2RuO4.
NATURE COMMUNICATIONS
(2021)
Article
Chemistry, Multidisciplinary
Lucien Eisenburger, Valentin Weippert, Carsten Paulmann, Dirk Johrendt, Oliver Oeckler, Wolfgang Schnick
Summary: TiP4N8 was synthesized from TiN and P3N5 using NH4F as a mineralizer, resulting in two polymorphs with different structures and prism shapes. The measured band gaps were confirmed by DFT calculations, which also predicted the thermochemistry of the polymorphs.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Chemistry, Multidisciplinary
Dennis Groedler, Martin L. Weidemann, Andreas Lichtenberg, Tobias Greven, Robin Nickstadt, Malek Haydo, Mathias Wickleder, Axel Klein, Dirk Johrendt, Sanjay Mathur, Markus Zegke, Aida Raauf
Summary: Lanthanoid and actinoid silylamides are versatile starting materials. A simple ligand exchange with tert-butanol leads to the formation of the first trimeric heterobimetallic uranyl-lanthanoid alkoxide complexes, where the mu(3) coordination of the endogenous uranyl oxo atom results in significant elongation of bond length and deviation from the linear uranyl arrangement.
CHEMICAL COMMUNICATIONS
(2022)
Article
Chemistry, Physical
Valentin Weippert, Kristian Witthaut, Monika Pointner, Malte Sachs, Lucien Eisenburger, Florian Kraus, Dirk Johrendt
Summary: RbGe7As15 and CsGe7As15 are narrow-band p-type semiconductors with high electrical conductivities and carrier densities, crystallized in a sodalite-type structure. BaGe8As14 exhibits an ultralow lattice thermal conductivity, while RbGe7As15 has a higher thermal conductivity due to the absence of rattling.
CHEMISTRY OF MATERIALS
(2021)
Article
Chemistry, Inorganic & Nuclear
Raimund Ziegler, Maximilian K. Reimann, Nadine Lammer, Bettina Rendenbach, Dirk Johrendt, Rainer Poettgen, Hubert Huppertz
Summary: Red single crystals of beta-WO2 with a distorted rutile type structure consisting of WO6 octahedra were synthesized under high-pressure/high-temperature conditions. A temperature dependent X-ray powder diffraction measurement revealed an irreversible phase transition from beta-WO2 to alpha-WO2. Magnetic measurements showed weakly positive susceptibility values, possibly due to paramagnetic impurities. DFT calculations predicted beta-WO2 to be a semiconductor with an indirect band gap.
ZEITSCHRIFT FUR ANORGANISCHE UND ALLGEMEINE CHEMIE
(2022)
Article
Chemistry, Inorganic & Nuclear
Dominik Werhahn, Brenden R. Ortiz, Aurland K. Hay, Stephen D. Wilson, Ram Seshadri, Dirk Johrendt
Summary: The kagome metals RbTi3Bi5 and CsTi3Bi5 were synthesized and studied, revealing their kagome network structure and AlB2-like layer structure. Magnetic and magnetotransport measurements showed specific magnetic and conductivity behavior in these compounds, and DFT calculations confirmed the metallic kagome band structure.
ZEITSCHRIFT FUR NATURFORSCHUNG SECTION B-A JOURNAL OF CHEMICAL SCIENCES
(2022)
Article
Chemistry, Physical
Tatyana Vasilchikova, Evgeniya Vavilova, Timur Salikhov, Vladimir Nalbandyan, Shanu Dengre, Rajib Sarkar, Hans-Henning Klauss, Alexander Vasiliev
Summary: The physical properties of the mixed-valent tellurate of lithium and manganese, LiMn2TeO6, were investigated using measurements of ac and dc magnetic susceptibility, magnetization, specific heat, electron spin resonance (ESR), and nuclear magnetic resonance (NMR). The compound orders magnetically in two steps at temperature T-1 = 20 K and T-2 = 13 K. Additionally, relaxation-type phenomena were observed in resonant measurements above the magnetic ordering temperature.
Article
Chemistry, Inorganic & Nuclear
Arthur Haffner, Otto E. O. Zeman, Thomas Braeuniger, Dirk Johrendt
Summary: Recent studies have shown that quaternary phosphidosilicates with sodium and barium exhibit remarkable ion conduction capabilities, but the crystal structures may lack sufficient pathways for fast sodium ion conductivity.
DALTON TRANSACTIONS
(2021)
Article
Materials Science, Multidisciplinary
S. Dengre, R. Sarkar, L. Opherden, T. Herrmannsdoerfer, M. Allison, T. Sohnel, C. D. Ling, J. S. Gardner, H-H Klauss
Summary: Fe4Si2Sn7O16 hosts an undistorted kagome lattice of Fe2+ (3d(6), S = 2) ions. Results show the presence of planar anisotropy in the kagome planes, with dominant magnetic fluctuations in these planes indicated by static NMR shift (K) and dynamic spin-lattice relaxation rate (1/T-1) analysis.
Article
Chemistry, Multidisciplinary
Valentin Weippert, Thanh Chau, Kristian Witthaut, Lucien Eisenburger, Dirk Johrendt
Summary: BaGe8As14 is a new sodalite-type compound synthesized via solid-state reactions. It has a partially disordered structure, a narrow bandgap of 0.43 eV, low resistivity of 2 x 10(-2) ohm-cm, and a high carrier concentration of 1.6 x 10(20) cm(-3) at 300 K, making it a potential thermoelectric material.
CHEMICAL COMMUNICATIONS
(2021)
Article
Chemistry, Inorganic & Nuclear
Arthur Haffner, Valentin Weippert, Dirk Johrendt
Summary: The new phosphidosilicates SrSi7P10 and BaSi7P10 were synthesized and their crystal structures determined. They exhibit a new triclinic structure type with vertex sharing SiP4 tetrahedra and alkaline earth cations residing in cuboctahedral voids. Both compounds are classified as semiconductors with small indirect bandgaps of 1.1 eV.
ZEITSCHRIFT FUR ANORGANISCHE UND ALLGEMEINE CHEMIE
(2021)
