Title

Vanadium Diboride (vb2) Synthesized At High Pressure: Elastic, Mechanical, Electronic, And Magnetic Properties And Thermal Stability

Document Type

Article

Publication Date

1-1-2018

Publication Title

Inorganic Chemistry

Publisher

American Chemical Society

Volume

57

Issue

3

First page number:

1096

Last page number:

1105

Abstract

Vanadium diboride (VB2) with an AlB2-type structure has been synthesized at 8 GPa and 1700 K in a D-DIA-type multianvil apparatus. The obtained bulk modulus is B0 = 262(2) GPa with fixed B′ = 4.0 for VB2 via high-pressure X-ray diffraction measurements. Meanwhile, VB2 has also been demonstrated to possess a high Vickers hardness of 27.2 ± 1.5 GPa, a high thermal stability of 1410 K in air, among the highest for transition-metal borides, and an extremely low resistivity value (41 μω cm) at room temperature. Results from first-principles calculations regarding the mechanical and electronic properties of VB2 are largely consistent with the experimental observations and further suggest that VB2 possesses simultaneously the properties of a hard and refractory ceramic and those of an excellent electric conductor. © 2018 American Chemical Society.

Language

English

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