Ultrastrong Boron Frameworks in ZrB<sub>12</sub>: A Highway for Electron Conducting

Ma, Teng; Zheng, Xu; Wang, Shanmin; Wang, Xiancheng; Zhao, Huaizhou; Han, Songbai; Liu, Jian; Zhang, Ruifang; Zhu, Pinwen; Long, Youwen; Cheng, Jinguang; Zhao, Yusheng; Jin, Changqing; Yu, Xiaohui

doi:10.1002/adma.201604003

Cited by 81 publications

(90 citation statements)

References 47 publications

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“…Metal borides constitute a class of materials that are still exotic to most chemists and material scientists, despite some excellent properties that have led to some key industrial applications such as hard magnets (Nd 2 Fe 14 B), superconductors (MgB 2 ), bulk refractory and conductive ceramics (ZrB 2 , HfB 2 ), and hard materials (TiB 2 ) . Also, several other properties of bulk metal borides have been the focus of many recent investigations, these include super hardness, thermoelectric and magnetic properties, materials for batteries, and catalysts . Transition metal boride materials have attracted considerable attention in recent years.…”

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confidence: 99%

A Simple, General Synthetic Route toward Nanoscale Transition Metal Borides

2018

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Most nanomaterials, such as transition metal carbides, phosphides, nitrides, chalcogenides, etc., have been extensively studied for their various properties in recent years. The similarly attractive transition metal borides, on the contrary, have seen little interest from the materials science community, mainly because nanomaterials are notoriously difficult to synthesize. Herein, a simple, general synthetic method toward crystalline transition metal boride nanomaterials is proposed. This new method takes advantage of the redox chemistry of Sn/SnCl , the volatility and recrystallization of SnCl at the synthesis conditions, as well as the immiscibility of tin with boron, to produce crystalline phases of 3d, 4d, and 5d transition metal nanoborides with different morphologies (nanorods, nanosheets, nanoprisms, nanoplates, nanoparticles, etc.). Importantly, this method allows flexibility in the choice of the transition metal, as well as the ability to target several compositions within the same binary phase diagram (e.g., Mo B, α-MoB, MoB , Mo B ). The simplicity and wide applicability of the method should enable the fulfillment of the great potential of this understudied class of materials, which show a variety of excellent chemical, electrochemical, and physical properties at the microscale.

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confidence: 99%

A Simple, General Synthetic Route toward Nanoscale Transition Metal Borides

2018

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“…The observed data can be well described by 1 0 = 6.4 mW cm À1 and A = 5.7 10 À4 mW cm À K À2 .T he residual resistivity ratio was defined as 1 (300 K) /1 0 = 7.0, which is very small for the contribution of impurity or grain boundary to the resistivity.T he resistivity at room temperature is about 45 mW cm À1 ,c omparable to some metals and metal alloys, such as CrB, VB 2 andZ rB 12 . [17,28,47] Indeed,t antalumm onoboride has ag ood balance between hardnessa nd electrical conductivity. This feature demonstrates that Ta Bi sa"covalent metal" compound.…”

Section: Resultsmentioning

confidence: 99%

“…Many boridesw ith extremely high boron content, such as tetraborides (WB 4 ,C rB 4 ,F eB 4 ,M nB 4 )a nd even dodecaborides (ZrB 12 ,S cB 12 ,Y B 12 ), have been synthesized. [23][24][25][26][27][28] However,i ti s still challenging to incorporate more boron atoms into most transition metal latticesw ith aB:TM molar ratio exceeding 4:1, due to their harsh synthesis conditions. Additionally,h igher boron content, especiallyt hat is highert han 4:1, will suppress the mobility of d-electrons in transition metal atoms owing to the strong hybridization between TMs d-orbital and LEs 2p-orbital.…”

Section: Introductionmentioning

confidence: 99%

Revealing the Unusual Rigid Boron Chain Substructure in Hard and Superconductive Tantalum Monoboride

Bao

Tang

et al. 2019

Chemistry A European J

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Poor electrical conductivity severely limits the diverse applicationso fh igh hardness materials in situations where electrical conductivities are highly desired. A" covalent metal" TaBw ith metallic electrical conductivity andh igh hardness has been fabricated by ah igh pressure and high temperature method. The bulk modulus, 302.0(4.9) GPa, and Vickers hardness, 21.3 GPa, approaches and even exceeds that of traditional insulating hard materials. Meanwhile, temperature-dependent electrical resistivity measurements show that Ta Bp ossesses metallic conductivity that rivals some widely-used conductors, and it will transformi nto as uperconductor at T c = 7.8 K. Contrary to commonu nderstanding, the hardnesso fT aB is higher than that of Ta B 2 ,w hich indicates that low boron concentration borides could be mechanically better than the higher boron concentration counterparts. Compression behavior and first principles calculations denotet hat the high hardness is associated with the ultra-rigid covalent boron chain substructure. The hardness of Ta Bw ith differentt opologies of boron substructure shows that besides incorporating higherb oron content, manipulating light element backbonec onfigurations is also critical for higher hardness amongst transition metal borides with identical boron content.[a] Dr.

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“…[22][23][24][25][26][27] Namely, the boron concentration plays an important role in mechanical properties of the TMBs. [28,29] In particular, the TMB 12 has a boron cuboctahedron cage, which is composed of 24 B atoms. The recent work has been shown that the TMB 12 is a potential superhard material because of the network B-B covalent bonds.…”

Section: Introductionmentioning

confidence: 99%

The influence of high pressure on the structural stability, Vickers hardness and mechanical properties of Re and Ru dodecaborides

Pan

Jia

2019

Int J of Quantum Chemistry

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We apply the first-principles approach to study the structural stability, Vickers hardness, and elastic modulus of ReB 12 and RuB 12 . In particular, we further investigate the influence of high pressure on the structural stability and mechanical properties of ReB 12 and RuB 12 . The calculated results show that ReB 12 and RuB 12 are thermodynamic stability under high pressure. Here, ReB 12 is more thermodynamic stability than that of the RuB 12 . The calculated Vickers hardness of ReB 12 and RuB 12 is 16.25 and 16.55 GPa, respectively. It is found that the calculated elastic constants and elastic modulus of ReB 12 and RuB 12 increase with increasing pressure. In particular, the calculated elastic constants and elastic modulus of ReB 12 are larger than that of the RuB 12 . The calculated electronic structure shows that the high hardness and elastic modulus of ReB 12 and RuB 12 are attributed to the 3D network B-B covalent bonds. K E Y W O R D Sfirst-principles calculations, hardness, mechanical properties, ReB 12 , RuB 12 , superhard materials

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Ultrastrong Boron Frameworks in ZrB₁₂: A Highway for Electron Conducting

Cited by 81 publications

References 47 publications

A Simple, General Synthetic Route toward Nanoscale Transition Metal Borides

A Simple, General Synthetic Route toward Nanoscale Transition Metal Borides

Revealing the Unusual Rigid Boron Chain Substructure in Hard and Superconductive Tantalum Monoboride

The influence of high pressure on the structural stability, Vickers hardness and mechanical properties of Re and Ru dodecaborides

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Ultrastrong Boron Frameworks in ZrB12: A Highway for Electron Conducting

Cited by 81 publications

References 47 publications

A Simple, General Synthetic Route toward Nanoscale Transition Metal Borides

A Simple, General Synthetic Route toward Nanoscale Transition Metal Borides

Revealing the Unusual Rigid Boron Chain Substructure in Hard and Superconductive Tantalum Monoboride

The influence of high pressure on the structural stability, Vickers hardness and mechanical properties of Re and Ru dodecaborides

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Ultrastrong Boron Frameworks in ZrB₁₂: A Highway for Electron Conducting