摘要
用DTA、XRD和EXAFS方法研究无电解镀镍磷合金层结构。其中含P10%(重量百分比)左右的Ni-P合金层是非晶态合金固溶体,Ni、P之间存在共价键作用,Ni—Ni键长0.25nm;Ni—P键长0.28nm;经400℃热处理1h后的含P10%的Ni-P镀层是Ni3P晶态与Ni-P非晶态的混合物。EXAFS方法给出了镍磷合金层的结构、键长和配位原子情况,体现出EXAFS方法在研究金属结构尤其是非晶态金属结构方面的优越性。
The structure of Electroless Ni-P alloy has been studied by using DTA,XRD and EXAFS methods,The P 10%(weight percentage ratio) Ni-P coating is a non-crystal alloy.The action between Ni and P is a convalent bond applied force,The lengths of Ni Ni and Ni P bonds are 0.25 nm and 0.28 nm.The P 10%Ni-P coating after heat treatment at 400℃ is a mixture of Ni_3P and non-crystal Ni-P.The formation of nickel phosphonus likely structure is established by EXAFS and confirmed by experiments in contrast to DTA and XRD which does not provide more information.The extended X-ray absorption fine structure(EXAFS) spectrophotometry developed with the development of synchronous radiation light.It is very suitable for the studies of non-crystal alloy.The coordination environment of Ni and P in Ni-P alloy coating has been measured by means of EXAFS.The degree of order in Ni-P alloy increases by the heat treatment.The loss of long-range order is even more pronounced with the increasing P content in Ni-P coating.The local order around Ni in Ni-P alloy coating resembles that in Ni metal.The discription of structure may be useful for interpretation of the properties Ni-P non-crystal alloy coating from the view of molecular level.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
1996年第2期278-281,共4页
Chemical Journal of Chinese Universities
基金
中国科学院沈阳腐蚀与防护研究所国家重点实验室资助