First-Principles Prediction on the High-Pressure Structures of Transition Metal Diborides (TMB2, TM = Sc, Ti, Y, Zr)

2010 ◽  
Vol 49 (15) ◽  
pp. 6859-6864 ◽  
Author(s):  
Meiguang Zhang ◽  
Hui Wang ◽  
Hongbo Wang ◽  
Xinxin Zhang ◽  
Toshiaki Iitaka ◽  
...  
Keyword(s):  
High Pressure ◽  
Transition Metal ◽  
First Principles ◽  
Metal Diborides ◽  
Transition Metal Diborides

ChemInform Abstract: First-Principles Prediction on the High-Pressure Structures of Transition Metal Diborides (TMB2, TM: Sc, Ti, Y, Zr).

ChemInform ◽  
2010 ◽  
Vol 41 (38) ◽  
pp. no-no
Author(s):  
Meiguang Zhang ◽  
Hui Wang ◽  
Hongbo Wang ◽  
Xinxin Zhang ◽  
Toshiaki Iitaka ◽  
...  
Keyword(s):  
High Pressure ◽  
Transition Metal ◽  
First Principles ◽  
Metal Diborides ◽  
Transition Metal Diborides

Phase Stability, Physical Properties, and Hardness of Transition-Metal Diborides MB2 (M = Tc, W, Re, and Os): First-Principles Investigations

2013 ◽  
Vol 117 (20) ◽  
pp. 10643-10652 ◽  
Author(s):  
Ming-Min Zhong ◽  
Xiao-Yu Kuang ◽  
Zhen-Hua Wang ◽  
Peng Shao ◽  
Li-Ping Ding ◽  
...  
Keyword(s):  
Transition Metal ◽  
Physical Properties ◽  
Phase Stability ◽  
First Principles ◽  
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.

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