Results 101 to 110 of about 115,078 (291)

Cyclic oxygen vacancy reconstruction in MnO2 polymorphs builds electron reservoirs to drive ionic charge redistribution for stepwise UO22 + reduction

Ecotoxicology and Environmental Safety
Effective uranium (UO22+) recovery from aqueous waste is vital for resource sustainability and environmental safety. Although oxygen vacancies enhance the redox activity of UO22+, their long–term stability and ability to regenerate remain unclear. Herein,
Shuang Zhang, Zixiong Wu, Wenting Zhu, Tao Bo, Yingcai Wang, Hao Jiang, Xiaoyan Li, Yibao Liu, Yuhui Liu   +8 more
doaj   +1 more source

Parameter Variation in Planetary Ball Milling of Titanium Aluminide Powder in XHV‐Adequate Atmosphere

Advanced Engineering Materials, EarlyView.
This study investigates the effects of milling parameters, including rotational speed, milling duration, and ball‐to‐powder ratio, on TiAl particle size and morphology in an XHV‐equivalent atmosphere. The creation of oxide‐free surfaces enhances the mechanical properties of green bodies.
Jytte Möckelmann, Armin Piwek, Julius Peddinghaus, Kai Brunotte, Bernd-Arno Behrens   +4 more
wiley   +1 more source

Oxygen Vacancies in Oxide Nanoclusters: When Silica Is More Reducible Than Titania

Frontiers in Chemistry, 2019
Oxygen vacancies are related to specific optical, conductivity and magnetic properties in macroscopic SiO2 and TiO2 compounds. As such, the ease with which oxygen vacancies form often determines the application potential of these materials in many ...
Andi Cuko, Andi Cuko, Stefan T. Bromley, Stefan T. Bromley, Monica Calatayud   +4 more
doaj   +1 more source

Diffusion and aggregation of oxygen vacancies in amorphous silica

Journal of Physics: Condensed Matter, 2017
Using density functional theory (DFT) calculations, we investigated oxygen vacancy diffusion and aggregation in relation to dielectric breakdown in amorphous silicon dioxide (a-SiO2). Our calculations indicate the existence of favourable sites for the formation of vacancy dimers and trimers in the amorphous network with maximum binding energies of ...
Munde, MS, Gao, DZ, Shluger, AL
openaire   +3 more sources

High‐Temperature Nanoindentation of Metals: Assessing Thermal Drift, Frame Compliance, and Chemical Composition Effects on the Reported Mechanical Properties

Advanced Engineering Materials, EarlyView.
Do not let thermal drift and instrument artifacts deceive high‐temperature nanoindentation results. We compare classical Oliver–Pharr and automatic image recognition analyses across steels and a Ni alloy to quantify these effects. Accounting for artifacts reveals systematic softening with temperature, while Cr and Ni additions boost resistance ...
Velislava Yonkova, Steffen Brinckmann, Ruth Schwaiger   +2 more
wiley   +1 more source

Rapid fabrication of oxygen-deficient zirconia by flash sintering treatment

Journal of Advanced Ceramics
The introduction of oxygen vacancies into zirconia is an effective strategy for enhancing its light absorption ability and photocatalytic performance.
Xinghua Su, Wenjin Li, Da Chen, Shuai Zhang, Chengguang Lou, Qiang Tian, Jianguo Zhao, Peng Zhao   +7 more
doaj   +1 more source

Recycling of NiTi Shape Memory Alloys: Fundamental and Technological Aspects of a Vacuum Induction Melting Processing Route

Advanced Engineering Materials, EarlyView.
The present study investigates recycling of NiTi shape memory alloys via vacuum induction melting. An ingot was synthesized from elemental Ni and Ti and subjected to three subsequent remelting cycles. Remelting increases process durations and impurity levels and adversely affects microstructures and functional properties.
Sakia Sophia Noorzayee, Son Tung Mai, Sarath Menon, Braulio Gadiel Sánchez Ortega, Ralf Drautz, Alexander Kauffmann, Gunther Eggeler, Jan Frenzel   +7 more
wiley   +1 more source

Emergent magnetic phase transitions in Fe-doped SrTiO3−δ

AIP Advances, 2019
In defect engineering, both cation doping and oxygen vacancies play key roles in deciding the properties of oxide, and the utilization of their cooperation has attracted much interest in recent years. Here, we report an emergent magnetic phase transition
Yujuan Pei, Ruyi Zhang, Yang Song, Jiachang Bi, Wei Xu, Chen Zhou, Junxi Duan, Jingkai Yang, Yanwei Cao   +8 more
doaj   +1 more source

Enhanced Strength and Corrosion Resistance of Ti‐13Nb‐12Ta‐10Zr‐4Sn Alloy by Aging Treatment

Advanced Engineering Materials, EarlyView.
This work systematically investigates the effect of aging treatment on mechanical properties and corrosion behavior of vacuum arc‐melted Ti‐13Nb‐12Ta‐10Zr‐4Sn alloy. Owing to the increased α″ martensite, strength and corrosion resistance were significantly enhanced by aging treatment.
Yuhua Li, Rong Zhao, Qian Zhang, Haojie Wang, Yujing Liu, Lai‐Chang Zhang   +5 more
wiley   +1 more source

Copper Nanocrystallization in Anodic Oxide Films of Ti–Cu‐Based Bulk Metallic Glass and Its Effect on the Corrosion Resistance and Cytocompatibility

Advanced Engineering Materials, EarlyView.
Viktoriia Shtefan, Thorgund Nemec, Ute Hempel, Annett Gebert and coworkers demonstrate that anodic treatment of Ti–Cu‐based metallic glass in a nontoxic pyrophosphate electrolyte forms a protective bilayered Ti/Zr‐oxide film enriched with Cu nanocrystals.
Viktoriia Shtefan, Nora Fernández Navas, Thorgund Nemec, Ivan Kaban, Ute Hempel, Andrea Voss, Volker Hoffmann, Darius Pohl, Annett Gebert   +8 more
wiley   +1 more source