Article
Multidisciplinary Sciences
M. B. Sreedhara, Simon Hettler, Ifat Kaplan-Ashiri, Katya Rechav, Yishay Feldman, Andrey Enyashin, Lothar Houben, R. Arenal, Reshef Tenne
Summary: The text discusses the significance and potential applications of asymmetric two-dimensional structures, the synthesis of asymmetric misfit layer superstructures, and the chemical selectivity and stability of these structures, providing insights for further research.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2021)
Article
Crystallography
Boris Straumal, Askar Kilmametov, Anna Korneva, Pawel Zieba, Yuri Zavorotnev, Leonid Metlov, Olga Popova, Brigitte Baretzky
Summary: Annealing Cu-14 wt% Sn alloy at 320 and 500 degrees C led to an increase in tin concentration in the copper-based matrix. High-pressure torsion (HPT) resulted in grain refinement of Cu, while the shape of alpha + epsilon phase colonies changed slightly. HPT-driven enrichment of Cu-based solid solution with Sn atoms decreased with higher initial tin concentration, as explained by theoretical analysis.
Article
Chemistry, Multidisciplinary
Monika M. M. Pointner, Oliver Oeckler, Wolfgang Schnick
Summary: Tetrahedra-based nitridophosphates have a rich structural chemistry, which can be expanded by incorporating cations in higher coordinated positions or substituting nitrogen atoms with other anions. In this study, SrAl5P4N10O2F3 was synthesized using a multianvil press at high temperature and high pressure. The structure of SrAl5P4N10O2F3 contains a novel unit composed of highly condensed tetra-face-capped octahedra, vertex-sharing PN4 tetrahedra, and chains of face-sharing Sr2+-centered cuboctahedra. Eu2+-doped SrAl5P4N10O2F3 exhibits blue emission under UV light.
CHEMISTRY-A EUROPEAN JOURNAL
(2023)
Article
Chemistry, Physical
Xin F. Tan, Flora Somidin, Stuart D. McDonald, Michael J. Bermingham, Hiroshi Maeno, Syo Matsumura, Kazuhiro Nogita
Summary: In this study, high voltage transmission electron microscopy (HV-TEM) was used to observe the morphological changes of Cu6Sn5 in a Sn-3.0 wt%Ag-0.5 wt%Cu (SAC305) solder alloy and Cu substrate. Continuous surveillance of Cu6Sn5 grain boundary movements during soldering increased the fundamental understanding of reaction mechanisms in solder solid/liquid interfaces.
Article
Nanoscience & Nanotechnology
Thilini U. Dissanayake, Mei Wang, Taylor J. Woehl
Summary: This study utilized LP-TEM and FM techniques to investigate the crosslinking and chain scission reactions of polymeric nanoparticle ligands under electron beam irradiation, revealing their impact on ligand coverage and emphasizing the importance of controlling electron beam radiation chemistry to avoid disturbances.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Multidisciplinary Sciences
Dongxin Liu, Satori Kowashi, Takayuki Nakamuro, Dominik Lungerich, Kaoru Yamanouchi, Koji Harano, Eiichi Nakamura
Summary: There is increasing attention to the chemical applications of transmission electron microscopy, but it is often hindered by radiation damage. This study focuses on the radiolysis damage in organic matter and aims to provide fundamental information on the product structure, electron energy influence, and reaction kinetics. By studying the [2 + 2] dimerization of a van der Waals dimer [60]fullerene in a carbon nanotube, the researchers identify five reaction pathways that serve as mechanistic models of radiolysis damage. The results highlight the importance of variable-temperature and variable-voltage kinetic analysis in understanding radiation damage mechanisms.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Review
Chemistry, Multidisciplinary
Igor d'Anciaes Almeida Silva, Ettore Bartalucci, Carsten Bolm, Thomas Wiegand
Summary: Recent studies have shown that mechanochemical strategies are beneficial for directed conversions of organic compounds. However, finding new reactions has been challenging due to the lack of mechanistic understanding of mechanochemical reaction events. Spectroscopic techniques play a crucial role in addressing these questions. In this overview, the opportunities and challenges of solid-state nuclear magnetic resonance (NMR) spectroscopy in the field of organic mechanochemistry are discussed. The strengths of solid-state NMR in ex situ structure characterization, differentiating polymorphs, NMR-crystallographic structure-determination protocols, and detecting weak noncovalent interactions in molecular-recognition events using proton-detected solid-state NMR experiments at fast MAS frequencies are highlighted.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Physical
Jin-Hu Dou, Maxx Q. Arguilla, Yi Luo, Jian Li, Weizhe Zhang, Lei Sun, Jenna L. Mancuso, Luming Yang, Tianyang Chen, Lucas R. Parent, Grigorii Skorupskii, Nicole J. Libretto, Chenyue Sun, Min Chieh Yang, Phat Vinh Dip, Edward J. Brignole, Jeffrey T. Miller, Jing Kong, Christopher H. Hendon, Junliang Sun, Mircea Dinca
Summary: Researchers have successfully grown single crystals of 2D metal-organic frameworks up to 200 µm in size by balancing in-plane and out-of-plane interactions, revealing anisotropic transport and a clear correlation between conductivity and the nature of the metal cation in the sheets.
Article
Materials Science, Ceramics
Fugang Lu, Ce Wang, Jiujie Xu, Zhanguo Liu, Panpan Lin, Tiesong Lin, Jincheng Lin, Xinfei Zhang, Xinyue Li, Peng He
Summary: Excess Li compensation powder (ECP) can be used as a covering powder in the pressureless sintering of Li-garnet solid electrolytes, optimizing the microstructure and improving the density and ionic conductivity.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Multidisciplinary
Xiaobo Chen, Jianyu Wang, Yaguang Zhu, Zhenhua Xie, Shuonan Ye, Kim Kisslinger, Sooyeon Hwang, Dmitri N. Zakharov, Guangwen Zhou
Summary: Noncatalytic gas-solid reactions are commonly assumed to be irreversible, but this study shows the existence of reverse elements in the Ni oxidation reaction, resulting in NiO reduction. The oxidation process involves preferential CO2 adsorption along step edges, while the reduction process involves preferential CO adsorption on step edges. Temperature and CO2 pressure effect maps are constructed to illustrate the dynamics of the competing NiO redox reactions. This study demonstrates the ability to manipulate gas-solid reactions by controlling the gas environment or atomic structure of the solid surface.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
Z. Faidon Brotzakis, Thomas Lohr, Michele Vendruscolo
Summary: Research using cryo-electron microscopy has identified the process of SARS-CoV-2 spike transitioning from closed to open state, revealing a cryptic pocket that could be targeted for therapeutic interventions. This study emphasizes the importance of understanding transient intermediate states of proteins for developing effective treatments against invisible binding sites.
Article
Materials Science, Ceramics
Hajime Yamamoto, Haruna Aizawa, Ikuya Yamada, Kaoru Toda, Atsushi Tanaka, Masaki Azuma, Yuki Sakai, Takumi Nishikubo, Hiroyuki Kimura
Summary: This study reports the valence states and electronic properties of solid solutions of (1 - x)PbVO3 - xBiCrO(3) synthesized under high-pressure and high-temperature conditions. A change in crystal structure and a tetragonal-to-cubic phase transition with negative thermal expansion were observed in the solid solutions. X-ray absorption spectroscopy and magnetic studies showed that the valence states of V4+ and Cr3+ in the solid solutions are robust.
JOURNAL OF ASIAN CERAMIC SOCIETIES
(2021)
Article
Multidisciplinary Sciences
Mokwon Kim, Hyunpyo Lee, Hyuk Jae Kwon, Seong-Min Bak, Cherno Jaye, Daniel A. Fischer, Gabin Yoon, Jung O. Park, Dong-Hwa Seo, Sang Bok Ma, Dongmin Im
Summary: A newly proposed strategy involves designing a highly conductive ruthenium-based composite as a carbon-free cathode to improve the cycle life and capacity of solid-state lithium-oxygen batteries. By utilizing this approach, the batteries achieved a specific capacity of 200 milliampere hour per gram over 665 discharge/charge cycles, showcasing a notable improvement compared to existing cathodes.
Article
Engineering, Environmental
Matthieu Riva, Jianfeng Sun, V. Faye McNeill, Charline Ragon, Sebastien Perrier, Yinon Rudich, Sergey A. Nizkorodov, Jianmin Chen, Frederic Caupin, Thorsten Hoffmann, Christian George
Summary: The study investigated the impact of Laplace pressure on chemical processes in atmospheric ultrafine particles, finding that high pressure significantly slows down reaction product formation. These results suggest that high pressure is a key factor influencing the chemical processes governing atmospheric aerosol growth and evolution.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2021)
Article
Chemistry, Physical
Doyoung Lee, Chang-Lae Kim, Yoonchul Sohn
Summary: The research focused on the formation and growth of intermetallic compounds during reactions between liquid Ga and solid Ni, revealing the presence of a Ga7Ni3 bottom layer and a GaxNi top layer. The experimental results are expected to be valuable for the future incorporation of liquid metals into electronic devices.
Article
Chemistry, Multidisciplinary
Sebastian J. J. Ambach, Cody Somers, Tristan de Boer, Lucien Eisenburger, Alexander Moewes, Wolfgang Schnick
Summary: Nitridophosphates are of great interest in current research, and a new compound, germanium nitridophosphate, has been synthesized and characterized. It has a highly condensed structure network and shows significant differences from other compounds.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Multidisciplinary
Daniel Guenther, Dominik Baumann, Wolfgang Schnick, Oliver Oeckler
Summary: The crystal structures of P40O31N46 and P74O59N84, synthesized from amorphous phosphorus oxide nitride imide, consist of complex frameworks of P(O,N)(4) tetrahedra. These structures form different chain-like building units with varying degrees of branching. Multiple disordered configurations are observed due to the combination and arrangement of these modular units. The disorder is likely a result of quenching a high-pressure phase with P(O,N)(5) trigonal bipyramids. Domains of both compounds are intergrown with H3P8O8N9, indicating a cutout structure from the larger frameworks. No additional phases are observed in powder diffraction patterns.
CHEMISTRY-A EUROPEAN JOURNAL
(2023)
Article
Chemistry, Multidisciplinary
Sebastian J. Ambach, Monika Pointner, Sophie Falkai, Carsten Paulmann, Oliver Oeckler, Wolfgang Schnick
Summary: Layered silicates are highly versatile materials that are of great importance to humanity. A new class of nitridophosphates, MP6N11 (M=Al, In), featuring rare nitrogen coordination motifs and mica-like layer structure, were successfully synthesized using MCl3, P3N5, and NH4N3 under high-pressure high-temperature conditions. The crystal structure of AlP6N11 was determined by synchrotron single-crystal diffraction, and isotypic InP6N11 was refined using Rietveld refinement. The compounds exhibit unique PN4 tetrahedra, PN5 trigonal bipyramids, and MN6 octahedral layers, with PN5 trigonal bipyramids reported only once and MN6 octahedra sparsely found in literature. AlP6N11 was also characterized using EDX, IR, and NMR spectroscopy. Despite the abundance of known layered silicates, no isostructural compound to MP6N11 has been discovered yet.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Multidisciplinary
Sophia L. Wandelt, Alexander Mutschke, Dmitry Khalyavin, Jennifer Steinadler, Wolfgang Schnick
Summary: Metal hydrides are a class of compounds that are used to create various functional materials. Neutron diffraction is necessary to study their structural characteristics due to the low scattering power of hydrogen for X-rays. In this study, a new strontium nitridoborate hydride, Sr-13[BN2](6)H-8, was synthesized and its crystal structure was determined using X-ray and neutron diffraction. The presence of anionic hydrogen within the structure was confirmed using MAS NMR and vibrational spectroscopy. Quantum chemical calculations supported the experimental findings. Sr-13[BN2](6)H-8 expands the family of nitridoborate hydrides and opens up possibilities for new and interesting materials.
CHEMISTRY-A EUROPEAN JOURNAL
(2023)
Editorial Material
Chemistry, Multidisciplinary
Daniel Guenther, Dominik Baumann, Wolfgang Schnick, Oliver Oeckler
Summary: The cover of this issue features the groups of Oliver Oeckler at Leipzig University and Wolfgang Schnick at University of Munich (LMU). The image showcases a diffraction pattern of a intergrown crystal containing P40O31N46, which resembles the night sky. The structures are complex and disordered, resembling the earth's surface, and are composed of chain-like building units in a modular building scheme.
CHEMISTRY-A EUROPEAN JOURNAL
(2023)
Article
Chemistry, Multidisciplinary
Sophia L. Wandelt, Alexander Mutschke, Dmitry Khalyavin, Robert Calaminus, Jennifer Steinadler, Bettina V. Lotsch, Wolfgang Schnick
Summary: Multianionic metal hydrides, with diverse physical properties and complex structures, have recently gained attention. In this study, we report the synthesis of Sr6N[BN2](2)H-3, the first compound that combines nitridoborate, nitride, and hydride anions. The crystal structure, determined using X-ray and neutron powder diffraction, reveals a three-dimensional network of nitridoborate units, strontium atoms, and hydride and nitride anions. Electrochemical measurements indicate the presence of hydride ion conductivity.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Multidisciplinary
Stefanie Schneider, Sebastian Klenk, Simon D. Kloss, Wolfgang Schnick
Summary: In this study, highly condensed and thermally stable lithium nitridophosphates were successfully synthesized, which are the first lithium nitridophosphates with a degree of condensation larger than 0.5 in their 3D networks.
CHEMISTRY-A EUROPEAN JOURNAL
(2023)
Article
Chemistry, Multidisciplinary
Monika M. M. Pointner, Oliver Oeckler, Wolfgang Schnick
Summary: Tetrahedra-based nitridophosphates have a rich structural chemistry, which can be expanded by incorporating cations in higher coordinated positions or substituting nitrogen atoms with other anions. In this study, SrAl5P4N10O2F3 was synthesized using a multianvil press at high temperature and high pressure. The structure of SrAl5P4N10O2F3 contains a novel unit composed of highly condensed tetra-face-capped octahedra, vertex-sharing PN4 tetrahedra, and chains of face-sharing Sr2+-centered cuboctahedra. Eu2+-doped SrAl5P4N10O2F3 exhibits blue emission under UV light.
CHEMISTRY-A EUROPEAN JOURNAL
(2023)
Article
Chemistry, Multidisciplinary
Stefanie Schneider, Sandra T. Kreiner, Lucas G. Balzat, Bettina V. Lotsch, Wolfgang Schnick
Summary: The crystalline lithium oxonitridophosphate Li8+xP3O10-xN1+x was synthesized from P3N5 and Li2O in an ampoule. The compound has a triclinic crystal structure with distinctive complex anion species, including non-condensed P(O,N)(4) tetrahedra and P(O,N)(7) double tetrahedra connected by one N atom. The compound also exhibits mixed occupation of O/N positions, allowing for variation of anionic species. To characterize these motifs, complementary analytical methods were used. The compound displays significant disorder in its double tetrahedra structure, as observed in single-crystal X-ray diffraction. Additionally, the compound is a Li+ ion conductor with a total ionic conductivity of 1.2x10(-7) S cm 1 at 25 degrees C, and an activation energy of 0.47(2) eV.
CHEMISTRY-A EUROPEAN JOURNAL
(2023)
Article
Crystallography
Pascal L. Jurzick, Georg Krach, Lukas Bruening, Wolfgang Schnick, Maxim Bykov
Summary: This article reports the successful synthesis of Silicon pernitride under high pressure conditions and resolves its crystal structure through X-ray diffraction analysis. It is found that the Si atom has a formal oxidation state of +IV, while the N atom forms pernitride anions.
ACTA CRYSTALLOGRAPHICA SECTION E-CRYSTALLOGRAPHIC COMMUNICATIONS
(2023)
Article
Chemistry, Physical
Tristan de Boer, Cody Somers, Teak Boyko, Sebastian Ambach, Lucien Eisenburger, Wolfgang Schnick, Alexander Moewes
Summary: We have characterized a newly synthesized germanium nitridophosphate, GeP2N4, which is structurally distinct due to the presence of Ge2+ lone pairs and bonding with nitrogen atoms. The presence of nitrogen vacancies and the band gap were investigated using X-ray excited optical luminescence and synchrotron-based X-ray spectroscopy, respectively.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
Article
Materials Science, Multidisciplinary
Marwin Dialer, Monika M. Pointner, Sophia L. Wandelt, Philipp Strobel, Peter J. Schmidt, Lkhamsuren Bayarjargal, Bjoern Winkler, Wolfgang Schnick
Summary: This study reports two mixed tetrahedral network structures, Sr2SiP2N6 and Sr5Si2P6N16, and elucidates their structures as well as the luminescent properties of Sr2SiP2N6:Eu2+ and Sr5Si2P6N16:Eu2+.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Muhammad Ruhul Amin, Philipp Strobel, Wolfgang Schnick, Peter J. Schmidt, Alexander Moewes
Summary: Understanding the electronic structure properties of narrow-band emitting phosphor materials is crucial for finding and customizing novel materials for pc-LEDs. The energetic position of the Eu2+ 5d(1) states determines the optical properties of the material, and can be experimentally determined using RIXS measurements.
JOURNAL OF MATERIALS CHEMISTRY C
(2022)
Article
Materials Science, Multidisciplinary
Dan Han, Stefan S. Rudel, Wolfgang Schnick, Hubert Ebert
Summary: This study investigates the phase stability, defect properties, and cation disorder of MgSnN2 and ZnSnN2 using first principles calculations. It is found that MgSnN2 can form in two different phases, while ZnSnN2 only crystallizes in one phase. MgSnN2 exhibits self-doped n-type conductivity, and the defect Sn-Mg is the primary source of free electrons. Cation disorder in MgSnN2 induces a reduction in the band gap due to violation of the octet rule.
Article
Materials Science, Multidisciplinary
Tristan de Boer, Md Fahim Al Fattah, Muhammad Ruhul Amin, Sebastian J. Ambach, Sebastian Vogel, Wolfgang Schnick, Alexander Moewes
Summary: Recent advances in high-pressure high-temperature methods have allowed for the synthesis of mixed ternary non-metal nitrides. In this study, the novel ternary nitride BP3N6 was investigated using X-ray absorption and emission spectroscopy, as well as density functional theory calculations. The band gap of BP3N6 was found to be close to the theoretical values predicted by different exchange-correlation functionals, and the presence of nitrogen vacancies leading to mid-gap trap states was revealed.
JOURNAL OF MATERIALS CHEMISTRY C
(2022)
