Results 81 to 90 of about 2,066 (185)

Enrichment characteristics and genesis mechanism of critical elements (Nb-Ta-Zr-Hf-REE-Y) in coals: a case study of Late Permian coalfield in Northeastern Guizhou, China

Frontiers in Earth Science
The discovery of coal-type beneficial metal deposits and corresponding genesis mechanisms are cutting-edge issues in current sedimentary environment research. Based on industrial analysis, mineralogy, and geochemical measurement of seven typical mines in
Ziyi Ye, Baoqing Li, Jialiang Cao
doaj   +1 more source

(NH4)2[Tc2O2(S2O7)4]: An Unexpected Technetium(V)‐Sulfate From the Reaction of (NH4)(TcO4) With SO3

Chemistry – A European Journal, EarlyView.
The reaction of the radioactive pertechnetate (99TcO4)− with the oxidizer SO3 leads to blue crystals of (NH4)2[Tc2O2(S2O7)4]. The complex dimeric [Tc2O2(S2O7)4]2− anion exhibits the technetium in the oxidation state V, showing that reduction occurs during the reaction.
Stefan Sutorius, Julian Heinen, David van Gerven, Jörn Bruns, Erik Strub, Mathias S. Wickleder   +5 more
wiley   +1 more source

Silent Partners in the Mill: Unveiling the Role of Additives in Mechanochemical Synthesis

Chemistry – A European Journal, EarlyView.
Mechanochemistry offers a sustainable, solvent‐free alternative to traditional synthesis, often enhanced by additives in a process known as additive‐assisted grinding. This review discusses how various additives, including liquids, ionic solids, and advanced materials like ionic liquids and piezoelectric compounds, improve reaction efficiency ...
Johanna Breinsperger, Nika Podlesnik, Francesco Mele, Michael Schnürch   +3 more
wiley   +1 more source

Effect of densification technology on the microstructure and mechanical properties of high-entropy (Ti, Zr, Hf, Nb, Ta)C ceramic-based cermets

Open Ceramics
High-entropy ceramic-based cermets represent a new and promising direction in improving the mechanical properties of conventional hardmetals through the formation of complex microstructures during synthesis. This has been systematically studied in two Co-
Dmytro Vedel, Tamás Csanádi, Petro Mazur, Anton Osipov, Juraj Szabó, Vladyslav Shyvaniuk, Richard Sedlák, Oleksandr Stasiuk, Veronika Kuchárová, Oleg Grigoriev   +9 more
doaj   +1 more source

Generalized Stacking Fault Energies of Aluminum Alloys–Density Functional Theory Calculations

Metals, 2018
Generalized stacking fault energies of aluminum alloys were calculated using density functional theory. Stacking fault energy of aluminum alloys was correlated with the d-electrons number of transition metal alloying elements. The tendency to twinning is
Marek Muzyk, Zbigniew Pakieła, Krzysztof J. Kurzydłowski   +2 more
doaj   +1 more source

Challenges and Advancements in High‐Nickel Layered Oxides Cathode Material for Lithium‐Ion Batteries

ENERGY &ENVIRONMENTAL MATERIALS, EarlyView.
As a representative high‐energy‐density cathode material for lithium‐ion batteries, NCM811 still encounters critical challenges. This review provides a comprehensive analysis of its failure mechanisms, summarizes recent modification strategies, and highlights the contributions of advanced characterization and simulation techniques to performance ...
Yunshan Zheng, Junfeng Li, Yijing Liu, Lanlan Feng, Wen Liu, LiLi Lin, Yiming Wang, Haoyang Peng, Jian Lu, Dong Zhou, Baohua Li   +10 more
wiley   +1 more source

Ultra‐High Nickel Oxides as Cathode Materials for High‐Energy Lithium‐Ion Batteries

ENERGY &ENVIRONMENTAL MATERIALS, EarlyView.
Ultra‐high nickel layered oxides are among the most promising cathode materials for high‐energy lithium‐ion batteries, offering high specific capacity and significant utilization in both conventional lithium‐ion batteries and solid‐state batteries. This review article introduces the basic structure of ultra‐high nickel layered oxides, then delves into ...
Yilong Han, Changlu Zheng, Zhichao Liu, Peng Chen, Sheng Liu, Guoran Li, Xue‐Ping Gao   +6 more
wiley   +1 more source

Processing And Densification Of Multi-Phase High-Entropy Ceramics [PDF]

This work focuses on the processing and densification of multiphase, high-entropy ceramics to promote their use in friction stir welding technologies.
Smith, Steven
core   +1 more source

Balancing the Competing Effects of Carrier and Phonon Transport Mechanisms to Enhance the Thermoelectric Properties of p‐Type Ti2Zr2−xHf2Nb2Fe5.6Ni2.4Sb8 Double Half‐Heusler Alloys via Cation Vacancy Engineering

ENERGY &ENVIRONMENTAL MATERIALS, EarlyView.
By designing Zr vacancy‐filled p‐type Ti2Zr2Hf2Nb2Fe5.6Ni2.4Sb8‐based thermoelectric materials, multi‐physics mechanisms and multi‐scale microstructural defects are induced to optimize electrical properties and phonon transport while suppressing the bipolar diffusion effect.
Chaoyue Wang, Mina Zhang, Longjun He, Shengpan Kan, Ruyan Song, Degang Zhao, Jinghao Li, Daoyong Cong, Xianglin Zhou   +8 more
wiley   +1 more source

Geochemical Features of the Weathered Materials Developed on Gabbro in a Semi-Arid Zone, Northern Cameroon

Geosciences, 2017
Investigation on the mobilization and the redistribution of major, trace and rare-earth elements (REE) was performed along a soil profile developed on gabbro in the semi-arid zone (Northern Cameroon), using mineralogical and geochemical analyses.
Désiré Tsozué, Paul-Désiré Ndjigui
doaj   +1 more source