Noncontact density measurements of tantalum and rhenium in the liquid and undercooled states
Noncontact density measurements of tantalum and rhenium in the liquid and undercooled states
复制标题
DOI：
10.1063/1.1624475
复制
发表时间：
2003-11
影响因子：
4
通讯作者：
P. Paradis;T. Ishikawa;S. Yoda
中科院分区：
文献类型：
--
作者：
P. Paradis;T. Ishikawa;S. Yoda
静电悬浮与多光束加热和紫外成像一起克服了与液体钽和钽的处理相关的污染、成像和样品位置稳定性问题。在这里，这些金属的密度[ρ（T）]是在过热和过冷状态下报告的。在2760-3580 K区间，钽的密度测量为ρ（T）=1.50×104 - 0.41（T-Tm）kg m-3，其中熔化温度Tm为3290 K。在2700-3810 K之间，测量得到的密度为ρ（T）=1.84×104 - 0.91（T-Tm），Tm=3453 K。根据这些数据，分别计算出体积膨胀系数为2.7×10−5和4.9×10−5 K−1。在Tm下，数据与文献值吻合良好。
Electrostatic levitation together with multibeam heating and ultraviolet imaging overcame contamination, imaging, and sample position stability problems associated with handling of liquid tantalum and rhenium. Here, the density [ρ(T)] of these metals is reported in the superheated and undercooled states. Over the 2760–3580 K interval, the density of tantalum was measured as ρ(T)=1.50×104−0.41(T−Tm) kg m−3, where the melting temperature Tm, was 3290 K. For rhenium, the density was determined (2700–3810 K) as ρ(T)=1.84×104−0.91(T−Tm), with Tm=3453 K. From these data, respective volume expansion coefficients of 2.7×10−5 and 4.9×10−5 K−1 were calculated. At Tm, the data agree well with the literature values.