Vanadium Diboride (VB2) Synthesized at High Pressure: Elastic, Mechanical, Electronic, and Magnetic Properties and Thermal Stability,Inorganic Chemistry

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Vanadium Diboride (VB2) Synthesized at High Pressure: Elastic, Mechanical, Electronic, and Magnetic Properties and Thermal Stability
Inorganic Chemistry ( IF 4.3 ) Pub Date : 2018-01-23 00:00:00 , DOI: 10.1021/acs.inorgchem.7b02550
Pei Wang ₁ , Ravhi Kumar ₁ , Esakki Muthu Sankaran ₁ , Xintong Qi ₂ , Xinyu Zhang ₃ , Dmitry Popov ₄ , Andrew L. Cornelius ₁ , Baosheng Li ₂ , Yusheng Zhao ₁ , Liping Wang ₁

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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.

中文翻译：

高压合成的_二硼化钒（VB ₂）：弹性，机械，电子和磁性能和热稳定性

具有AlB ₂型结构的二硼化钒（VB ₂）已经在D-DIA型多砧装置中以8GPa和1700K合成。通过高压X射线衍射测量，对于VB ₂，获得的体积模量为B ₀ = 262（2）GPa，固定B '= 4.0 。同时，还证明了VB ₂具有27.2±1.5 GPa的高维氏硬度，空气中1410 K的高热稳定性，过渡金属硼化物中的最高维氏硬度以及极低的电阻率值（41μΩcm）在室温下。关于VB ₂的机械和电子特性的第一性原理计算结果在很大程度上与实验观察结果一致，并且进一步表明，VB ₂同时具有硬质和耐火陶瓷的特性以及优良的电导体的特性。

更新日期：2018-01-23

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