Results 31 to 40 of about 15,700 (190)

Enrichment of critical elements (Nb-Ta-Zr-Hf-REE) within coal and host rocks from the Datanhao mine, Daqingshan Coalfield, northern China

Ore Geology Reviews, 2019
This paper discusses the modes of occurrence of critical elements and their origins in the studied coal and associated rock samples (partings and roof strata) from the Datanhao coal mine, Daqingshan Coalfield, Inner Mongolia, northern China.
Lei Zhao, S. Dai, V. Nechaev, E. V. Nechaeva, I. Graham, D. French, Jihua Sun   +6 more
semanticscholar   +1 more source

Mechanical and electronic properties of new stable transition metal carbonitrides

Results in Physics, 2023
Using first-principles calculations, we conducted a comprehensive investigation into the crystal structures, mechanical properties, and electronic structures of Ta4CN3 and Ta2CN compounds through the substitution of Ta atoms with transition metals (Cr ...
Jing Luo, Qun Wei, Xiaofei Jia, Meiguang Zhang, Zhenhua Wu, Xuanmin Zhu   +5 more
doaj   +1 more source

In-situ formation mechanism of a superlattice (Ti,Zr,Hf,Nb,Ta)C high-entropy carbide via reactive melt infiltration

Materials & Design
High-entropy carbide ceramics are promising ultrahigh-temperature materials due to their excellent thermal stability and mechanical properties. However, their synthesis typically relies on energy-intensive techniques such as high temperatures and ...
Yuyu Song, Yejie Cao, Yuran Xia, Yansong Liu, Yongsheng Liu   +4 more
doaj   +1 more source

Geochemical Compositions of Size‐Fractioned Sediment Samples From the Yangtze and Yellow Rivers: Implications for Chemical Weathering, Fractionation Behavior of Provenance Tracers, and Sources of Radial Sand Ridges

Geochemistry, Geophysics, Geosystems, 2023
River sediments are valuable archives of the environmental conditions within their catchments. The Yangtze and Yellow Rivers are the most active fluvial systems for sediment transport in East Asia, and they are regarded as potential sediment sources for ...
Chao Wu, Yang Wu, Xiaoxiao Yu, Yiwei Chen, Weiguo Zhang, Jie Liu, Gangjian Wei   +6 more
doaj   +1 more source

COMPOSITIONAL FEATURES AND AGE OF ALKALINE GRANITES OF THE INGUR MASSIF, WESTERN TRANS-BAIKAL AREA

Геодинамика и тектонофизика, 2022
The Ingur alkaline granite massif and the associated Zr-Nb occurrence make up part of the largest Mongolian-Trans-Baikal alkaline granitoid provinces. The massif is composed of arfvedsonite, biotite, and alaskite granites. High content of HREE determines
M. V. Rampilova, M. O. Rampilov, I. A. Izbrodin   +2 more
doaj   +1 more source

Comparing the Tribological Properties of the Coatings (Ti-Hf-Zr-V-Nb-Ta)N and (Ti-Hf-Zr-V-Nb-Ta)N + DLC [PDF]

Журнал нано- та електронної фізики, 2015
The paper compares the tribological characteristics of the coatings (Ti-Hf-Zr-V-Nb-Ta)N and (Ti-Hf-Zr-V-Nb-Ta)N + DLC obtained by means of vacuum-arc deposition method.
U.S. Nyemchenko, V.M. Beresnev, V.F. Gorban, V.Ju. Novikov, O.V. Yaremenko   +4 more
doaj  

Developing a variable charge potential for Hf/Nb/Ta/Ti/Zr/O system via machine learning global optimization

Materials & Design, 2023
Despite widespread attentions on the HfNbTaTiZr refractory high-entropy alloy (RHEA) owing to various exceptional properties, insights into nanostructure-property relations are severely hindered by the lack of reliable interatomic potentials in atomistic
Yihan Wu, Wenshan Yu, Shengping Shen
doaj   +1 more source

Computational screening study of double transition metal carbonitrides M′2M″CNO2-MXene as catalysts for hydrogen evolution reaction

npj Computational Materials, 2021
Two-dimensional (2D) transition metal carbonitrides (MXene) have attracted growing interest in electrocatalytic hydrogen production due to its structural and electronic properties.
Zhoulan Zeng, Xingzhu Chen, Kaiyi Weng, Yang Wu, Peng Zhang, Jizhou Jiang, Neng Li   +6 more
doaj   +1 more source

A method for locating ore bodies by geochemical indexes of pegmatite-type lithium deposits in the Ke'eryin area, western Sichuan, China

Dizhi lixue xuebao, 2022
The Ke'eryin area in Sichuan province is one of the large rare metal ore concentration areas in the Songpan–Garze metallogenic belt. Numerous granite pegmatite dikes spread around the Ke'eryin mass.
TANG Wenchun, DUAN Wei, ZOU Lin, YANG Guibing, ZHANG Wei, XIONG Guan   +5 more
doaj   +1 more source

Geological controls on the distribution of REY-Zr (Hf)-Nb (Ta) enrichment horizons in late Permian coals from the Qiandongbei Coalfield, Guizhou Province, SW China

, 2020
The abnormal enrichment of the REY (rare earth elements and yttrium)-Zr (Hf)-Nb (Ta) assemblage in Late Permian coals occurring in some coalfields in SW China has been extensively investigated, but the geological controlling factors of this assemblage ...
Bao-qing Li, X. Zhuang, X. Querol, N. Moreno, P. Córdoba, Yunfei Shangguan, Linjian Yang, Jing Li, Feng Zhang   +8 more
semanticscholar   +1 more source