著者

堀田 浩充

出版者

東北大学

雑誌

東北大學選鑛製錬研究所彙報 (ISSN:0040876X)

巻号頁・発行日

vol.33, no.1, pp.9-14, 1977-09-30

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The details of observations of the photoconductive spectra (0.7 to 2.5 μm) for the natural pyrite crystal are described with some supplements to the experimental results of the previous report. Several sub-peaks have been observed at 77 K near the principal peak of 0.9 eV which is attributed to the interband transition. The sign of dE_G/dT is determined to be negative from the temperature-variation of the peak. Photoconductive decay of the natural pyrite crystal has been observed at 77 K with the 2 μs pulsed white light. Three different life times (τ_j) have been derived from the empirical formula, V=Σ V_jexp (-t/τ_j), which applies to the observed decay curve. Their values of τ_j are about 80 μs, 5 ms and 65 ms, respectively.