The Physical Properties of Cuprous Sulfides-Semiconductors.

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Cuprous sulfido has been observed to have two transition points at about 110℃ and 470℃ respectively, of which the latter one has been found out experimentally by the writer. The exsistence of the phase transition at 470℃ has been confirmed experimentally by the measurements of electronic and ionic conductivity, thermal linear expansion, heat capacity, specific heat and thermo-electromotive force. We, therefore, propose that cuprous sulfide has three polymorphic phases, namely, α-phase (above 470℃), β-phase (470℃〜110℃) and γ-phase (below 110℃). In the γ-phase it behaves as a P-type semiconductor (sulphur excess), and its electrical conductivity increases exponentially with temperature. In the β-phase we have observed the rather remarkable ionic currents together with the sharp decrease of electronic currents. On proceeding to the α-phase, the ionic currents abruptly disappear and electronic currents increase to the larger amount than that in the γ-phase. The transition enery at 110℃ has bee observed to be more than ten times (about 4.8 cal/gr.) larger than that at 470℃. In the β-phase, the anomalous thermo-electromomotive force has been. sometimes observed, which may be considered to be caused by the heterogeneous distribution of the movable copper ions.
社団法人日本物理学会の論文
1951-12-25