Microscopic investigation of local structural and electronic properties of tungsten tetraboride: a superhard metallic material

doi:10.1007/s10853-018-3078-6

KMS > 物质科学与技术学院 > PI研究组 > Dimitrios Koumoulis组

	Microscopic investigation of local structural and electronic properties of tungsten tetraboride: a superhard metallic material
	Turner, Christopher L.1; Zujovic, Zoran 2,3; Koumoulis, Dimitrios4,7 ; Taylor, R. E.1; Kaner, Richard B.1,5,6
	2019-02
发表期刊	JOURNAL OF MATERIALS SCIENCE (IF:3.5[JCR-2023],4.0[5-Year])
ISSN	0022-2461
卷号	54 期号:4 页码:3547-3557
发表状态	已发表
DOI	10.1007/s10853-018-3078-6
摘要	Tungsten borides, such as tungsten tetraboride ( WB4) exhibit a wide range of appealing physical properties, including superhardness, chemical inertness and electronic conductivity. Among the various tungsten borides, the most puzzling remains WB4, with its crystal structure to linger in question for over half a century ( Lech et al. in Proc Natl Acad Sci USA 112: 3223- 3228, 2015). In the present investigation, polycrystalline WB4 samples have been synthesized with two different methods and characterized at the atomic level by combining X- ray diffraction, scanning electron microscopy and nuclear magnetic resonance spectroscopy. The 11 B multiple quantum MAS experiment revealed a range of boron sites that were not resolved within the experiment. This result is in contrast to the 11 B MAS spectrum of WB2 with four resolved, discernible boron resonances. However, despite the structural complexity and boron- site variety in WB4, the detection of a single exponential of 11 B spin- lattice relaxation recovery suggested that all of the boron sites relaxed with a single time constant. The Knight shift ( K) was found to be independent of temperature while the T 1 1 was governed by the Korringa law with a Korringa product T1T = 350 sK across the entire temperature range ( 168- 437 K) of this study. The measured Korringa product was small, indicating substantial spin- lattice relaxation resulting from coupling with the conduction carriers. The abovementioned experimental results not only clearly rule out structures, such as the `` MoB4- type phase'' of WB4, with the resulting Fermi level in the pseudo- gap as has previously been predicted theoretically; but they also provide a comprehensible and valuable insight into the structural and electronic properties of WB4 at the atomic level.
收录类别	SCI ; SCIE ; EI
语种	英语
资助项目	National Science Foundation MRI program[1532232] ; National Science Foundation MRI program[DMR-1506860]
WOS研究方向	Materials Science
WOS类目	Materials Science, Multidisciplinary
WOS记录号	WOS:000452502500062
出版者	SPRINGER
WOS关键词	SPIN-LATTICE-RELAXATION ; B-11 NMR ; BORIDES ; STATES ; SPECTROSCOPY ; DENSITY ; NUCLEI ; ALB2
原始文献类型	Article
引用统计	正在获取...
文献类型	期刊论文
条目标识符	https://kms.shanghaitech.edu.cn/handle/2MSLDSTB/29948
专题	物质科学与技术学院_PI研究组_Dimitrios Koumoulis组
通讯作者	Koumoulis, Dimitrios; Taylor, R. E.
作者单位	1.Univ Calif Los Angeles, Dept Chem & Biochem, Los Angeles, CA 90095 USA 2.Univ Auckland, Sch Chem Sci, NMR Ctr, Private Bag 92019, Auckland, New Zealand 3.Univ Auckland, Sch Chem Sci, Biocide Toolbox Res Programme, Private Bag 92019, Auckland, New Zealand 4.ShanghaiTech Univ, Sch Phys Sci & Technol, Shanghai 201210, Peoples R China 5.Univ Calif Los Angeles, Dept Mat Sci & Engn, Los Angeles, CA 90095 USA 6.Univ Calif Los Angeles, Calif NanoSyst Inst, Los Angeles, CA 90095 USA 7.SUNY Buffalo, Dept Phys, Buffalo, NY 14260 USA
通讯作者单位	物质科学与技术学院
推荐引用方式 GB/T 7714	Turner, Christopher L.,Zujovic, Zoran,Koumoulis, Dimitrios,et al. Microscopic investigation of local structural and electronic properties of tungsten tetraboride: a superhard metallic material[J]. JOURNAL OF MATERIALS SCIENCE,2019,54(4):3547-3557.
APA	Turner, Christopher L.,Zujovic, Zoran,Koumoulis, Dimitrios,Taylor, R. E.,&Kaner, Richard B..(2019).Microscopic investigation of local structural and electronic properties of tungsten tetraboride: a superhard metallic material.JOURNAL OF MATERIALS SCIENCE,54(4),3547-3557.
MLA	Turner, Christopher L.,et al."Microscopic investigation of local structural and electronic properties of tungsten tetraboride: a superhard metallic material".JOURNAL OF MATERIALS SCIENCE 54.4(2019):3547-3557.