Journal of Applied Physics
Quantitative x-ray-diffraction measurements were performed on a nanocrystalline Cu sample made by severe plastic deformation. The shape of Bragg reflections was found to be represented primarily by a Lorentzian function. A difference of as much as 6%+/-3% was revealed between the integrated intensities from the nanocrystalline and a reference coarse-grained Cu samples. The broadening of Bragg reflections from the nanocrystalline Cu sample was mainly induced by small crystallite sizes and microstrains inside the grains and/or the deformed layers near the grain boundaries. It was found that the grain sizes of nanocrystalline Cu in different crystallographic orientations are essentially the same, while the microstrains exhibit a significant anisotropy. The Debye-Waller parameter B of the nanocrystalline Cu sample was 0.97+/-0.06 Angstrom(2), which suggests that the atomic displacement from their ideal lattice positions equals on average 0.111+/-0.004 Angstrom or 4.3% of the nearest-neighbor spacing. (C) 1996 American Institute of Physics.
关键词:
pd
赵中一
,
董秋花
,
席黎灵
贵金属
doi:10.3969/j.issn.1004-0676.2004.02.001
在3.0～5.2mol/L的磷酸介质中,室温下Pd能与邻磺酸偶氮若丹宁反应,生成桔红色络合物,可据此测定Pd的含量.方法摩尔吸光系数为5.1×104 L mol-1cm-1,在0～35μg Pd/10mL范围内符合比耳定律.较大量的共存pt不干扰pd的测定.在水浴加热至100℃时,pd与pt均能与邻磺酸偶氮若丹宁发生显色反应,借此建立了同时测定pt与pd的方法.将该法用于pt、Pd回收废液中Pd和pt的测定,结果令人满意.
关键词:
分析化学
,
邻磺酸偶氮若丹宁
,
Pt
,
pd
,
分光光度法
