YB6: A ‘Ductile’ and Soft Ceramic with Strong Heterogeneous Chemical Bonding for Ultrahigh-Temperature Applications

Yanchun Zhou; Bin Liu; Huimin Xiang; Zhihai Feng; Zhongping Li

doi:10.1080/21663831.2015.1052109

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YB6: A ‘Ductile’ and Soft Ceramic with Strong Heterogeneous Chemical Bonding for Ultrahigh-Temperature Applications

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- YB6: A ‘Ductile’ and Soft Ceramic with Strong Heterogeneous Chemical Bonding for Ultrahigh-Temperature Applications
- Materials Research Letters Vol. 3, Issue 4, Pages: 210-215(2015)
- 作者机构：
  
  1. Science and Technology on Advanced Functional Composite Laboratory Aerospace Research Institute of Materials & Processing Technology No. 1 South Dahongmen Road
  2. Department of Materials Science and Engineering University of Tennessee Knoxville
- 作者简介：
- 基金信息：
- DOI：10.1080/21663831.2015.1052109
  CLC：
- Online First：11 June 2015，
  
  Published：2015
- 稿件说明：
移动端阅览
Yanchun Zhou, Bin Liu, Huimin Xiang, et al. YB6: A ‘Ductile’ and Soft Ceramic with Strong Heterogeneous Chemical Bonding for Ultrahigh-Temperature Applications[J]. Materials Research Letters, 2015, 3(4): 210-215.
DOI：

Yanchun Zhou, Bin Liu, Huimin Xiang, et al. YB6: A ‘Ductile’ and Soft Ceramic with Strong Heterogeneous Chemical Bonding for Ultrahigh-Temperature Applications[J]. Materials Research Letters, 2015, 3(4): 210-215. DOI： 10.1080/21663831.2015.1052109.

摘要

Abstract

Transition metal borides have contributed to the success of ultrahigh-temperature materials (UHTM) development. Current ZrB

- and HfB

-based UHTMs exhibit high-temperature environmental stability

high strength and modulus but inevitable brittleness due to strong covalent bonding. In contrast but interestingly

is predicted as a ‘ductile’ and soft ceramic for ultrahigh-temperature applications

through density functional theory investigations on its electronic structure and bonding properties. The ‘ductility’ is underpinned by chemical bonding anisotropy

that is

a strong

bond connecting the B

octahedra and a weak banana bond formed by overlapping the lobes of two perpendicular

orbitals (τ bond).

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