Precision dilatometry of Nb, Ta, and Lu tritides.
Precision dilatometry of Nb, Ta, and Lu tritides.
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Nb、Ta 和 Lu 氚化物的精密膨胀测量。
DOI：
10.1103/physrevb.40.1277
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发表时间：
1989
期刊：
影响因子：
--
通讯作者：
Trinkaus
中科院分区：
文献类型：
--
作者：
Schober;Dieker;Lässer;Trinkaus
我们分别应用室温浮力膨胀法（toNbT/sub 0.0253/）和室温应变应变膨胀法（78 K至TaT/sub 0.0744/ /和lut /sub 0.15/ /）测量了在T充注后的头两年，由于T转变为/sup 3/He而引起的三位体膨胀。对于所有三种三联潮，几乎发现线性膨胀，表明气泡中的密度近似恒定/sup 3/He。气泡中He原子所需的相应体积值约为8a /sup /。相关的压力值是借助/sup 3/He的状态方程推导出来的，该方程适用于固体/sup 4/He上最近的高压x射线衍射测量。随着/sup / he浓度的增加，压力似乎收敛到金属剪切模量的0.2左右，这与最近关于气泡冲孔位错环的阈值压力的理论结果一致。
Applying buoyancy dilatometry at room temperature toNbT/sub 0.0253/ and strain-gauge dilatometry at roomtemperature and 78 K to TaT/sub 0.0744/ andLuT/sub 0.15/, respectively, we have measured the swelling ofthese tritides due to the transmutation of T to /sup 3/He in the firsttwo years after T charging. For all three tritides almost linear swelling isfound, indicating approximately constant /sup 3/He densities inbubbles. The corresponding values for the volume requirement of a/sup 3/He atom in a bubble are around 8 A/sup 3/.Associated pressure values are derived with the aid of an equation of state for/sup 3/He adapted to recent high-pressure x-ray-diffractionmeasurements on solid /sup 4/He. With increasing /sup 3/Heconcentration the pressure seems to converge to about 0.2 of the shear modulusof the metal, in accordance with recent theoretical results concerning thethreshold pressure for dislocation-loop punching by bubbles.