Concentrations of hydrogen from 3 to 4 × 10 18 at . / cc have been found by vacuum fusion gas analysis in specially prepared single crystals of Ge. In these same crystals oxygen concentrations of 1 to 2 × 10 18 at . / cc were also found. Three special preparations of Ge were made by the hydrogen reduction of GeO 2 in graphite. In the first, Ge was melted once under hydrogen, in the second, 12 times, and in the third, 42 times. Single crystals were grown from portions of these ingots in graphite crucibles under an atmosphere of hydrogen. Resistivities of the n ‐type crystals were in the range 1–10 ohm cm, and lifetimes of several hundred microseconds were observed. There was no significant variation in hydrogen and oxygen concentration from one crystal to the other. Since the ratio of hydrogen to oxygen is around two, the possibility exists that these elements may be present in the crystal as H 2 O . Vacuum crystal growing lowered the hydrogen and oxygen content 20–30 fold.
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Thurmond et al. (1956) studied this question.