Hideki Tonda1, Takushi Gotoh2, Yuusei Nakashima3 and Tatsuo Kawasaki1
1Department of Metallurgy, Faculty of Engineering, Kumamoto University, Kumamoto
Four etchants revealing both fresh and old dislocations as etch pits in zinc (99.999%) crystals were developed. (1) G solution: The chemical composition by volume is 190 parts CH3COOH, 10 parts 35%H2O2, 1 ∼ 2 parts 36%HCl, and 50 parts H2O. This etchant produced etch pits with rhombic shapes and those with arrowhead-like shapes on 20 and 3 0 surfaces, respectively. (2) K solution: The composition is 95 parts HCOOH and 5 parts 35%H2O2. Etch pits developed on 2 0 surfaces in this solution were rectangular. (3) N solution: The composition is 40 parts CH3COOH, 10 parts 35%H2O2, one part 36%HCl, and 20 ∼ 40 parts H2O. This produced two kinds of etch pits on 10 0 surfaces, that is, light (rectangular) and dark (lenticular) pits corresponding probably to basal and non-basal dislocations, respectively. The addition of a small amount of FeCl3⋅6H2O, surfactants, etc. to N solution modified the shape of etch pits. (4) T solution: The composition is 10 ∼ 30 parts CH3COOH, 10 ∼ 30 parts 35%H2O2, 1 ∼ 3 parts 36%HCl, and 1000 parts H2O. This yielded etch-pits or-grooves on 0001 surfaces corresponding to non-basal dislocations.
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