scholarly journals High-entropy ceramic thin films; A case study on transition metal diborides

2018 ◽  
Vol 149 ◽  
pp. 93-97 ◽  
Author(s):  
P.H. Mayrhofer ◽  
A. Kirnbauer ◽  
Ph. Ertelthaler ◽  
C.M. Koller
Keyword(s):  
Thin Films ◽  
Transition Metal ◽  
High Entropy ◽  
Ceramic Thin Films ◽  
Metal Diborides ◽  
Transition Metal Diborides

scholarly journals Enabling highly efficient and broadband electromagnetic wave absorption by tuning impedance match in high-entropy transition metal diborides (HE TMB2)

2021 ◽  
Author(s):  
Weiming Zhang ◽  
Fu-Zhi Dai ◽  
Huimin Xiang ◽  
Biao Zhao ◽  
Xiaohui Wang ◽  
...  
Keyword(s):  
Electromagnetic Wave ◽  
Transition Metal ◽  
Impedance Match ◽  
Magnetic Losses ◽  
High Entropy ◽  
Wave Absorption ◽  
Highly Efficient ◽  
Absorbing Materials ◽  
Metal Diborides ◽  
Transition Metal Diborides

AbstractThe advance in communication technology has triggered worldwide concern on electromagnetic wave pollution. To cope with this challenge, exploring high-performance electromagnetic (EM) wave absorbing materials with dielectric and magnetic losses coupling is urgently required. Of the EM wave absorbers, transition metal diborides (TMB2) possess excellent dielectric loss capability. However, akin to other single dielectric materials, poor impedance match leads to inferior performance. High-entropy engineering is expected to be effective in tailoring the balance between dielectric and magnetic losses through compositional design. Herein, three HE TMB2 powders with nominal equimolar TM including HE TMB2-1 (TM = Zr, Hf, Nb, Ta), HE TMB2-2 (TM = Ti, Zr, Hf, Nb, Ta), and HE TMB2-3 (TM = Cr, Zr, Hf, Nb, Ta) have been designed and prepared by one-step boro/carbothermal reduction. As a result of synergistic effects of strong attenuation capability and impedance match, HE TMB2-1 shows much improved performance with the optimal minimum reflection loss (RLmin) of −59.6 dB (8.48 GHz, 2.68 mm) and effective absorption bandwidth (EAB) of 7.6 GHz (2.3 mm). Most impressively, incorporating Cr in HE TMB2-3 greatly improves the impedance match over 1–18 GHz, thus achieving the RLmin of −56.2 dB (8.48 GHz, 2.63 mm) and the EAB of 11.0 GHz (2.2 mm), which is superior to most other EM wave absorbing materials. This work reveals that constructing high-entropy compounds, especially by incorporating magnetic elements, is effectual in tailoring the impedance match for highly conductive compounds, i.e., tuning electrical conductivity and boosting magnetic loss to realize highly efficient and broadband EM wave absorption with dielectric and magnetic coupling in single-phase materials.

High-entropy transition metal diborides by reactive and non-reactive spark plasma sintering: A comparative investigation

2020 ◽  
Vol 40 (4) ◽  
pp. 942-952 ◽  
Author(s):  
Giovanna Tallarita ◽  
Roberta Licheri ◽  
Sebastiano Garroni ◽  
Simone Barbarossa ◽  
Roberto Orrù ◽  
...  
Keyword(s):  
Transition Metal ◽  
Spark Plasma Sintering ◽  
Comparative Investigation ◽  
High Entropy ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Metal Diborides ◽  
Transition Metal Diborides

Bond deformation paths and electronic instabilities of ultraincompressible transition metal diborides: Case study ofOsB2andIrB2

2014 ◽  
Vol 90 (9) ◽  
Author(s):  
R. F. Zhang ◽  
D. Legut ◽  
X. D. Wen ◽  
S. Veprek ◽  
K. Rajan ◽  
...  
Keyword(s):  
Transition Metal ◽  
Metal Diborides ◽  
Transition Metal Diborides ◽  
Bond Deformation

Compressibility of AlB2-type transition metal diborides

2002 ◽  
Vol 14 (44) ◽  
pp. 10615-10618 ◽  
Author(s):  
A S Pereira ◽  
C A Perottoni ◽  
J A H da Jornada ◽  
J M L ger ◽  
J Haines
Keyword(s):  
Transition Metal ◽  
Type Transition ◽  
Metal Diborides ◽  
Transition Metal Diborides

Incompressibility and Hardness of Solid Solution Transition Metal Diborides: Os1−xRuxB2

2009 ◽  
Vol 21 (9) ◽  
pp. 1915-1921 ◽  
Author(s):  
Michelle B. Weinberger ◽  
Jonathan B. Levine ◽  
Hsiu-Ying Chung ◽  
Robert W. Cumberland ◽  
Haider I. Rasool ◽  
...  
Keyword(s):  
Solid Solution ◽  
Transition Metal ◽  
Metal Diborides ◽  
Transition Metal Diborides
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