Results 171 to 180 of about 15,700 (190)

A New Class of Entropy Stabilized Oxides: Commensurately Modulated A 6B 2O 17 (A = Zr, Hf, B = Nb, Ta) Structures

Social Science Research Network, 2021
High entropy oxides (HEOs) have experienced a meteoric rise in the past decade. Here, we report a new class of entropy stabilized A6B2O17 (A = Zr, Hf; B = Nb, Ta) oxides whose enthalpies of formation have been determined by high temperature oxide melt ...
A. Voskanyan, K. Lilova, S. McCormack, W. Kriven, A. Navrotsky   +4 more
semanticscholar   +1 more source

Synergistic hardening in a dual phase high‐entropy (Hf,Nb,Ta,Ti,Zr)C–(Hf,Nb,Ta,Ti,Zr)B2 ultra‐high temperature ceramic

Journal of The American Ceramic Society
A dual phase high‐entropy (Hf,Nb,Ta,Ti,Zr)C–(Hf,Nb,Ta,Ti,Zr)B2 ultra‐high temperature ceramic was synthesized using a single step boro‐carbothermal reduction route.
Rubia Hassan, W. Fahrenholtz, G. Hilmas, S. Curtarolo   +3 more
semanticscholar   +1 more source

Entropy stabilized single-phase (Hf,Nb,Ta,Ti,Zr)B2 solid solution powders obtained via carbo/boro-thermal reduction

, 2020
This report deals with the synthesis of entropy stabilized (ES) single-phase (Hf,Nb,Ta,Ti,Zr)B2 powders, with specific surface area of about 1.6 m2/g, in a AlB2-type structure using individual transition metal (TM) oxides and, for the first time ...
F. Monteverde, F. Saraga
semanticscholar   +1 more source

Geochemistry, mineralogy and genesis of rare metal (Nb-Ta-Zr-Hf-Y-REE-Ga) coals of the seam XI in the south of Kuznetsk Basin, Russia

Ore Geology Reviews, 2019
The research describes the detailed mineralogical and geochemical characteristics of rare-metal Nb-Ta-Zr-Hf-Y-REE-Ga ores found in Permian coals in the layer XI in the south of the Kuznetsk Basin.
S. Arbuzov, D. Spears, A. V. Vergunov, S. Ilenok, A. Mezhibor, V. Ivanov, N. Zarubina   +6 more
semanticscholar   +1 more source

Fractionation of geochemical twins (Zr/Hf, Nb/Ta and Y/Ho) and HREE-enrichment during magmatic and metamorphic processes in peralkaline nepheline syenites from Norra Kärr (Sweden)

, 2020
The 1.49 Ga Norra Karr complex (Sweden) consists of deformed and metamorphosed peralkaline nepheline syenites that contain eudialyte-group minerals as the major host of high field strength elements and rare earth elements.
P. Atanasova, M. Marks, M. Frenzel, J. Gutzmer, J. Krause, G. Markl   +5 more
semanticscholar   +1 more source

Synthesis and thermoelectric properties of high-entropy half-Heusler MFe1−xCoxSb (M = equimolar Ti, Zr, Hf, V, Nb, Ta)

Journal of Alloys and Compounds, 2022
The application of the high-entropy concept has generated many interesting results for both alloys and ceramics. However, there are very few reports on high entropy thermoelectric materials. In this work, a single phase high-entropy half-Heusler compound
Kan Chen, Ruizhi Zhang, J. Bos, M. Reece
semanticscholar   +1 more source

Composition and origin of Ti–Nb–Ta–Zr bearing minerals in the Abu Diab highly evolved granite from the Central Eastern Desert of Egypt

, 2020
The central Eastern Desert (CED) of Egypt is well-known for its granite-related Nb–Ta mineralization. The garnet-bearing muscovite granite (GMG) of the Abu-Diab composite pluton in the CED consists mainly of quartz, K-feldspar (Or88–98), albite (An0-4 ...
M. Sami, N. M. Mahdy, T. Ntaflos, Douaa Fathy   +3 more
semanticscholar   +1 more source

The role of multi-elements and interlayer on the oxidation behaviour of (Hf-Ta-Zr-Nb)C high entropy ceramics

, 2020
Isothermal oxidation of (Hf-Ta-Zr-Nb)C high entropy carbide (HEC4) was performed using thermo-gravimetric analysis at 800−1100 °C in air. Polycrystalline oxide layers with multi-element oxides were observed, and their thickness increased with increasing ...
Yichen Wang, Ruizhi Zhang, Buhao Zhang, O. Skurikhina, P. Baláž, V. Araullo-Peters, M. Reece   +6 more
semanticscholar   +1 more source

Ti–Zr–Hf–Nb–Ta–Sn high-entropy alloys with good properties as potential biomaterials

Rare Metals, 2022
Wei Yang, S. Pang, Guan Wang, Y. Liu, P. Liaw, Tao Zhang   +5 more
semanticscholar   +1 more source

Designing CoCrFeNi-M (M = Nb, Ta, Zr, and Hf) eutectic high-entropy alloys via a modified simple mixture method

Journal of Alloys and Compounds, 2023
Wenna Jiao, Junwei Miao, Yiping Lu, Xiaohu Chen, Zheng Ren, Guomao Yin, Tingju Li   +6 more
semanticscholar   +1 more source