Abstract
The present experiments were carried out by the qualitative measurements of the temperature dependency of conductivity, and by taking the differential thermal curves, utilizing the specimens metallized from vitreous selenium.In addition, the electrical property of the deposited monoclinic selenium was studied.In summarizing the results, the following conclusions were obtained;(1) In the metallized selenium the reversible thermal change occurred at about 209°.(2) From the considerations of the conductivity-temperature relations, it was found that the allotropic transformation would occur at a temperature which correspounds to the thermal change, that is, one allotropic form which was stable below about 209° had the positive temperature coefficient of conductivity in both cases of heating and cooling, but another form which was stable in a temperature range higher than about 209° showed a tendency of the negative temperature coefficient especially in the case of super-cooling. The former was the hexagonal selenium and the latter (in the super-cooled state) was supposed to be the monoclinic one, considering from the X-ray results previously reported by the author.(3) Examining the deposited monoclinic selenium, it was found that this variety was originally a good conductor, but because of the occluded gas, probably CS2, behaved like an insulator.
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