(Cr0.2Mn0.2Fe0.2Co0.2Mo0.2)B: A novel high-entropy monoboride with good electromagnetic interference shielding performance in K-band

doi:10.1016/j.jmst.2020.09.047

Abstract

Abstract:

A novel equimolar high-entropy (HE) transition metal monoboride, (Cr_0.2Mn_0.2Fe_0.2Co_0.2Mo_0.2)B, was designed and prepared in powder and bulk form by high temperature elemental reaction method and spark plasma sintering (SPS) method, respectively. XRD analysis shows that HE (Cr_0.2Mn_0.2Fe_0.2Co_0.2Mo_0.2)B possesses orthorhombic structure with Pnma space group. Through Rietveld refinement, the lattice parameters of HE (Cr_0.2Mn_0.2Fe_0.2Co_0.2Mo_0.2)B are a = 5.6675, b = 2.9714, c = 4.2209 and the theoretical density is 6.95 g/cm³. The Vickers hardness and electrical conductivity of HE (Cr_0.2Mn_0.2Fe_0.2Co_0.2Mo_0.2)B bulk with relative density of 90 % is 12.3 ± 0.5 GPa and 0.49 ± 0.04 × 10⁶ S/m, respectively. Due to high electrical conductivity, HE (Cr_0.2Mn_0.2Fe_0.2Co_0.2Mo_0.2)B bulk with 3.0 mm thickness displays superior EMI shielding performance in 18.0-26.5 GHz (K-band), and the average values of SE_T, SE_R, and SE_A are 23.3 dB, 13.9 dB, and 9.4 dB, respectively. The EMI shielding mechanism of HE (Cr_0.2Mn_0.2Fe_0.2Co_0.2Mo_0.2)B mainly results from reflection.

Key words: High-entropy ceramics, Transition metal monoboride, Electromagnetic interference (EMI) shielding, Mechanical properties, Electrical conductive ceramics

Haiming Zhang, Biao Zhao, Fu-Zhi Dai, Huimin Xiang, Zhili Zhang, Yanchun Zhou. (Cr_0.2Mn_0.2Fe_0.2Co_0.2Mo_0.2)B: A novel high-entropy monoboride with good electromagnetic interference shielding performance in K-band[J]. J. Mater. Sci. Technol., 2021, 77: 58-65.

Figures/Tables 12

References 65

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Transition metal element	Covalent radius (Å)	Radius difference (%)
Cr	1.26	4.13
Mn	1.26	4.13
Fe	1.26	4.13
Co	1.21	0
Mo	1.31	8.26

Transition metal element	Covalent radius (Å)	Radius difference (%)
Cr	1.26	4.13
Mn	1.26	4.13
Fe	1.26	4.13
Co	1.21	0
Mo	1.31	8.26

Chemical formula	Composition analysis
	Cr (at. %)	Mn (at. %)	Fe (at. %)	Co (at. %)	Mo (at. %)
(Cr_0.2Mn_0.2Fe_0.2Co_0.2Mo_0.2)B	20.28	20.70	20.05	19.24	19.73
	19.28	19.10	20.91	19.83	20.88
	18.00	22.30	20.68	17.62	21.40
	17.98	21.23	20.86	19.60	20.33
	19.41	20.64	18.10	21.09	20.77
	18.55	19.36	20.30	22.50	19.28
	19.78	17.98	22.50	19.31	20.42
	19.57	18.40	18.94	21.34	21.74
	19.97	19.37	19.17	21.77	19.71
	18.75	20.08	19.11	19.20	22.87
Average value	19.16	19.92	20.06	20.15	20.71
Standard deviation	0.80	1.33	1.27	1.48	1.08
Nominal composition	(Cr_0.2Mn_0.2Fe_0.2Co_0.2Mo_0.2)B

Chemical formula	Composition analysis
	Cr (at. %)	Mn (at. %)	Fe (at. %)	Co (at. %)	Mo (at. %)
(Cr_0.2Mn_0.2Fe_0.2Co_0.2Mo_0.2)B	20.28	20.70	20.05	19.24	19.73
	19.28	19.10	20.91	19.83	20.88
	18.00	22.30	20.68	17.62	21.40
	17.98	21.23	20.86	19.60	20.33
	19.41	20.64	18.10	21.09	20.77
	18.55	19.36	20.30	22.50	19.28
	19.78	17.98	22.50	19.31	20.42
	19.57	18.40	18.94	21.34	21.74
	19.97	19.37	19.17	21.77	19.71
	18.75	20.08	19.11	19.20	22.87
Average value	19.16	19.92	20.06	20.15	20.71
Standard deviation	0.80	1.33	1.27	1.48	1.08
Nominal composition	(Cr_0.2Mn_0.2Fe_0.2Co_0.2Mo_0.2)B

Molecular formula	(Cr_0.2Mn_0.2Fe_0.2Co_0.2Mo_0.2)B	MnB [55]	FeB [56]	CoB [57]	CrB [58]	MoB [59]
Crystal system	Orthorhombic	Orthorhombic	Orthorhombic	Orthorhombic	Orthorhombic	Orthorhombic
Space group	Pnma (62)	Pnma (62)	Pnma (62)	Pnma (62)	Cmcm (63)	Cmcm (63)
Formula units	4	4	4	4	4	4
Density (g/cm³)	6.95	6.36	6.71	7.32	6.10	8.65
Lattice constants (Å)	a = 5.6675	a = 5.5610	a = 5.5032	a = 5.2720	a = 2.9681	a = 3.1418
	b = 2.9714	b = 2.9773	b = 2.9474	b = 3.0424	b = 7.8629	b = 8.4961
	c = 4.2209	c = 4.1472	c = 4.0587	c = 3.9501	c = 2.9299	c = 3.0721