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• W2069331359 abstract "Abstract The major advantages of activation analysis over almost all other analytical techniques are the avoidance of errors due to impurities in the chemical reagents employed in the procedure and high sensitivity in the determination of selective trace elements. A nondestructive investigation was made of six doped gallium arsenide crystals (Cr, O, Si, Ge) grown by the Bridgman, Czoehralski and eutectic epitaxy techniques. The detection in the parts per billion to parts per million range and identification of radioisotopes of impurity elements having relatively short (t 1 2 ⩽ 0.5 day ) and moderately long (t 1 2 ⩾ 2−250 days ) half-lives was considered. The specific resistivity range from 0.003 to 10 8 Ω cm was studied. No direct correlation was established between resistivity and spectrum intensity except for one heavily Si-doped crystal. All gallium arsenide crystals contained silicon at levels of 4·3 × 10 16 −4·7 × 10 17 atoms cm 3 . Other impurities detected were indium, gold, germanium and zinc at concentrations 16 atoms cm 3 ; none of these were consistent contaminants. Phosphorus and indium were identified in a Ge-epitaxy layer on a Si-doped GaAs substrate. Semi-insulating Cr-doped gallium arsenide cyrstals were analyzed for chromium and found to contain 9·8 × 10 17 −1·59 × 10 18 Cr cm 3 . The chromium activation analysis results do not appear to bear any relationship with the concentrations derived from the electrical measurements and suggest the existence of an inhomogeneous second phase. Improvements in the instrumental technique are discussed which can lead to the determination of additional elements for trace characterization of bulk and solution grown gallium arsenide." @default.
• W2069331359 created "2016-06-24" @default.
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• W2069331359 date "1970-04-01" @default.
• W2069331359 modified "2023-09-25" @default.
• W2069331359 title "Survey analysis of impurities in gallium arsenide by instrumental neutron activation" @default.
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• W2069331359 doi "https://doi.org/10.1016/0022-3697(70)90194-0" @default.
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