First demonstration of possible two-dimensional MBene CrB derived from MAB phase Cr2AlB2

doi:10.1016/j.jmst.2018.02.024

Abstract

Abstract:

In this communication, the possibility for the preparation of two-dimensional MBene CrB from MAB phase Cr₂AlB₂ is demonstrated for the first time. Herein M is a transition metal, A is a group III_A or IV_A element and B is boron; MAB phases are layered transition metal ternary borides, MBene is used to emphasize the loss of A group element from the parent MAB phases and to highlight the 2D nature. The possible 2D CrB nano sheets are prepared by selectively etching out Al layers from Cr₂AlB₂ by immersing the Cr₂AlB₂ powders in dilute HCl solution at room temperature. The as-prepared 2D CrB nano sheets are examined using X-ray diffraction and scanning electron microscopy and energy dispersive X-ray spectroscopy (EDS). In addition, different structure models are built to explain the observed phenomena. The discovery in this work opens a door to the synthesis of a large number of new 2D MBenes from MAB phases.

Key words: 2D CrB nano sheets, Mbene, MAB phases, Exfoliation, Transition metal borides

Haiming Zhang, Huimin Xiang, Fu-zhi Dai, Zhili Zhang, Yanchun Zhou. First demonstration of possible two-dimensional MBene CrB derived from MAB phase Cr₂AlB₂[J]. J. Mater. Sci. Technol., 2018, 34(11): 2022-2026.

Figures/Tables 7

References

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Element	Weight%	Atomic%
B	12.40	40.38
Al	0.52	0.68
Cr	87.07	58.94

Element	Weight%	Atomic%
B	12.40	40.38
Al	0.52	0.68
Cr	87.07	58.94

	(CrB)₂(OH)_ac	(CrB)₂(OH)_a	(CrB)₂(OH)_c
space group	PM2M	PMNM	PMNM
lattice parameters	a = 3.280 ?	a = 2.823 ?	a = 2.934 ?
	b = 12.681 ?	b = 11.264 ?	b = 11.236 ?
	c = 2.993 ?	c = 2.909 ?	c = 2.808 ?
	α = 90°	α = 90°	α = 90°
	β = 90°	β = 90°	β = 90°
	γ = 90°	γ = 90°	γ = 90°
atom positions	Cr(0.5, 0.2442, 0)	Cr(0, 0.2150, 0)	Cr(0, 0.2153, 0)
	Cr(0, 0.4314, 0)	Cr(0.5, 0.4311, 0)	Cr(0.5, 0.4268, 0)
	Cr(0.5, 0.5569, 0.5)	B(0.5, 0.2839, 0.5)	B(0.5, 0.2850, 0.5)
	Cr(0, 0.7441, 0.5)	B(0, 0.3653, 0.5)	B(0, 0.3716, 0.5)
	B(0, 0.3222, 0.5)	O(0.5, 0.0899, 0)	O(0, 0.0897, 0.5)
	B(0.5, 0.3843, 0.5)	H(0.5, 0.0036, 0)	H(0, 0.0032, 0.5)
	B(0, 0.6040, 0)
	B(0.5, 0.6662, 0)
	O(0.5, 0.1156, 0.5)
	O(0, 0.1778, 0)
	O(0.5, 0.8111, 0.5)
	O(0, 0.8726, 0)
	H(0.5, 0.0395, 0.5)
	H(0, 0.1015, 0)
	H(0.5, 0.8868, 0.5)
	H(0, 0.9487, 0)
	(CrB)₁(OH)_ac	(CrB)₁(OH)_a	(CrB)₁(OH)_c
space group	PMAM	PMAM	PMAM
lattice parameters	a = 3.160 ?	a = 2.808 ?	a = 2.973 ?
	b = 8.540 ?	b = 8.016 ?	b = 7.713 ?
	c = 3.652 ?	c = 2.908 ?	c = 2.721 ?
	α = 90°	α = 90°	α = 90°
	β = 90°	β = 90°	β = 90°
	γ = 90°	γ = 90°	γ = 90°
atom positions	Cr(0.75, 0.3013, 0)	Cr(0.75, 0.3419, 0)	Cr(0.75, 0.3356, 0)
	B(0.25, 0.4966, 0.5)	B(0.25, 0.4471, 0.5)	B(0.25, 0.4398, 0.5)
	O(0.25, 0.1436, 0)	O(0.25, 0.1667, 0)	O(0.75, 0.1480, 0.5)
	O(0.75, 0.2310, 0.5)	H(0.25, 0.0467, 0)	H(0.75, 0.0217, 0.5)
	H(0.25, 0.0333, 0)
	H(0.75, 0.1176, 0.5)

	(CrB)₂(OH)_ac	(CrB)₂(OH)_a	(CrB)₂(OH)_c
space group	PM2M	PMNM	PMNM
lattice parameters	a = 3.280 ?	a = 2.823 ?	a = 2.934 ?
	b = 12.681 ?	b = 11.264 ?	b = 11.236 ?
	c = 2.993 ?	c = 2.909 ?	c = 2.808 ?
	α = 90°	α = 90°	α = 90°
	β = 90°	β = 90°	β = 90°
	γ = 90°	γ = 90°	γ = 90°
atom positions	Cr(0.5, 0.2442, 0)	Cr(0, 0.2150, 0)	Cr(0, 0.2153, 0)
	Cr(0, 0.4314, 0)	Cr(0.5, 0.4311, 0)	Cr(0.5, 0.4268, 0)
	Cr(0.5, 0.5569, 0.5)	B(0.5, 0.2839, 0.5)	B(0.5, 0.2850, 0.5)
	Cr(0, 0.7441, 0.5)	B(0, 0.3653, 0.5)	B(0, 0.3716, 0.5)
	B(0, 0.3222, 0.5)	O(0.5, 0.0899, 0)	O(0, 0.0897, 0.5)
	B(0.5, 0.3843, 0.5)	H(0.5, 0.0036, 0)	H(0, 0.0032, 0.5)
	B(0, 0.6040, 0)
	B(0.5, 0.6662, 0)
	O(0.5, 0.1156, 0.5)
	O(0, 0.1778, 0)
	O(0.5, 0.8111, 0.5)
	O(0, 0.8726, 0)
	H(0.5, 0.0395, 0.5)
	H(0, 0.1015, 0)
	H(0.5, 0.8868, 0.5)
	H(0, 0.9487, 0)
	(CrB)₁(OH)_ac	(CrB)₁(OH)_a	(CrB)₁(OH)_c
space group	PMAM	PMAM	PMAM
lattice parameters	a = 3.160 ?	a = 2.808 ?	a = 2.973 ?
	b = 8.540 ?	b = 8.016 ?	b = 7.713 ?
	c = 3.652 ?	c = 2.908 ?	c = 2.721 ?
	α = 90°	α = 90°	α = 90°
	β = 90°	β = 90°	β = 90°
	γ = 90°	γ = 90°	γ = 90°
atom positions	Cr(0.75, 0.3013, 0)	Cr(0.75, 0.3419, 0)	Cr(0.75, 0.3356, 0)
	B(0.25, 0.4966, 0.5)	B(0.25, 0.4471, 0.5)	B(0.25, 0.4398, 0.5)
	O(0.25, 0.1436, 0)	O(0.25, 0.1667, 0)	O(0.75, 0.1480, 0.5)
	O(0.75, 0.2310, 0.5)	H(0.25, 0.0467, 0)	H(0.75, 0.0217, 0.5)
	H(0.25, 0.0333, 0)
	H(0.75, 0.1176, 0.5)

First demonstration of possible two-dimensional MBene CrB derived from MAB phase Cr₂AlB₂

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