热膨胀
半径
过渡金属
金属
Atom(片上系统)
化学
硼
粘结强度
衍射
材料科学
熔点
粘结长度
热的
结晶学
热力学
冶金
复合材料
图层(电子)
晶体结构
物理
嵌入式系统
光学
催化作用
有机化学
胶粘剂
生物化学
计算机科学
计算机安全
出处
期刊:Journal of The Less Common Metals
日期:1988-07-01
卷期号:141 (1): 145-156
被引量:59
标识
DOI:10.1016/0022-5088(88)90219-6
摘要
The thermal expansions of the group IV–VII transition metal diborides were studied with the aid of X-ray powder diffraction. The diborides were studied over the temperature range 298–1500 K. All the diborides except for CrB2 display larger thermal expansion coefficients in the c direction than in the a direction. The expansion coefficients in the c direction decrease with increasing radius of the metal atom, a fact which can be correlated to an increase in metal-boron bond strength. The thermal expansion coefficient in the a direction changes very little with the size of the metal radius, owing to the fact that the bonding strength in the basal plane is determined by the strong B-B bonds within the boron layer. The mean thermal expansion coefficients of the diborides increase linearly with their reciprocal melting points.
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