Dissolution of the (111) Surface of Cu-Au Dilute Alloy Single Crystals in Young's Solution(<Special Issue>Functional Devices, Components and Single Crystal Growth)

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  • Sugawara Shigeo
    Department of Materials Engineering and Applied Chemistry, Mining College, Akita University
  • Watanabe Jiro
    Department of Materials Engineering and Applied Chemistry, Mining College, Akita University

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Other Title
  • Cu-希薄Au合金単結晶(111)面のYoung液による溶解(<特集>機能素子・部品と単結晶育成)
  • Cu-希薄Au合金単結晶(111)面のYoung液による溶解
  • Cu キハク Au ゴウキン タンケッショウ 111 メン ノ Youngエキ

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Abstract

The (111) surface of Cu-0.01〜0.2 at% Au alloy crystals was etched for 10s at 280 K in Young's solution (1 kmol・m^<-3> (NH_4)_2S_2O_8> 6kmol・m^<-3> NH_4OH, 0.3 kmol・m^<-3> NH_4Br) using a rotating disc method. The dissolved depth of matrix surface S was measured by twobeam interferometry and the width h and depth d of triangular pyramid of dislocation etch pits were measured by replica electron microscopy. The horizontal dissolved length and the vertical dissolved depth at the dislocation site, Hand D, were determined from S, h and d, respectively. Both H and D increased to a maximum value at Au concentration as small as 0.01-0.05 at% and then decreased gradually, while S increased slightly with a small increase of Au concentration and attained a constant value at 0.03-0.2 at% Au. It was shown that these results could be explained qualitatively on the basis of the two-dimensional nucleation theory of crystal dissolution by considering the variations of the mobility of step, the activation energy for dissolution and the difference of chemical potentials when Au concentration was increased.

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