Thermal expansion behavior study of Co nanowire array with in situ x-ray diffraction and x-ray absorption fine structure techniques

Guang Mo; Quan Cai; Longsheng Jiang; Wei Wang; Kunhao Zhang; Weidong Cheng; Xueqing Xing; Zhongjun Chen; Zhonghua Wu
October 2008
Applied Physics Letters;10/27/2008, Vol. 93 Issue 17, p171912
Academic Journal
In situ x-ray diffraction and x-ray absorption fine structure techniques were used to study the structural change of ordered Co nanowire array with temperature. The results show that the Co nanowires are polycrystalline with hexagonal close packed structure without phase change up until 700 °C. A nonlinear thermal expansion behavior has been found and can be well described by a quadratic equation with the first-order thermal expansion coefficient of 4.3×10-6/°C and the second-order thermal expansion coefficient of 5.9×10-9/°C. The mechanism of this nonlinear thermal expansion behavior is discussed.


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