Light Figures and Surface Structures Revealed by Chemically Etched Germanium Single Crystals
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概要
- 論文の詳細を見る
Light figures projected on a plate screen from germanium single crystals, polished mechanically and etched with various chemical reagents, are examined in order to find out light figures or etching directions suitable for the orientation determination. In. formation regarding surface structures of germanium single crystals developed by mechanical polishing and by chemical etching has been obtained from the analysis of the observed light figures and from microscopic observations of crystal surfaces. It has been found that distinct light figures suitable for the orientation work are obtained by a short time etching with concentrated nitric acid plus water (1 : 1 and 3 : 7 ; 70℃), with concentrated nitric acid plus water plus hydrofluoric acid plus silver nitrate (45 cc+45 cc+10 cc+50 or 20 mg, and 20 cc+40 cc+40 cc+2 g), with hydrofluoric acid plus hydroperoxide plus water (1 : 1 : 4), and with 30 percent hydroperoxide (100℃). Among these etchants, hydrofluoric acid plus hydroperoxide plus water (1 : 1 : 4) is most suited for accurate orientation determination. Generally, crystal faces developed by etching have been found to be those belonging to the principal crystal zones, but dilute nitric acid heated at 70℃ develops some additional high-index crystal faces belonging to a high-index crystal zone. There is a tendency that low-index crystal faces appear by a short time etching and high-index ones by a prolonged etching. It is to be added that relatively clear light figures are obtained on germanium crystals as polished with silicon carbide powder.
- 東北大学の論文
著者
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Yamamoto M.
Research Center For Nuclear Physics Osaka University
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Yamamoto Mikio
Research Institute For Iron Steel And Other Metals
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WATANABE Jiro
Research Institute for Iron, Steel and Other Metals
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HOSHI Kinji
Research Institute for Iron, Steel and Other Metals
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Watanabe Jiro
Research Institute For Iron Steel And Other Metals
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Hoshi Kinji
Research Institute For Iron Steel And Other Metals
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Yamamoto M.
Research Institute for Iron, Steel and Other Metals
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