スピネル型強磁性半導体,CdCr_2Se_4の合成と光スペクトルの測定

概要

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Synthesis of CdCr_2Se_4 spinel for optical spectra measurements has been carried out by the dry technique at 773, 873 and 973 K. Although nearly single phase was obtained at 873 and 973 K after extremely long period of heating, say 47 d, of presintered materials at 773 K, 100 d heating at 773 K did not yield single phase due to firm association of accessory phases of Cr_2Se_3 and Cr_2Se_3. EPMA mapping analysis for such samples showed the independent presence of massive grains of CdSe among the spinel grains and disseminated presence of Cr_2Se_3 in the spinel grains as inclusions. This isolate presence of CdSe and Cr_2Se_3 is probably the main cause of preventing the formation of the spinel single phase in a short period of time. Unitcell parameters, spinel u-parameters and band gaps as measured by XRD and optical spectroscopy were 1.0744-1.0749 nm, 0.388-0.389 and 1.27-1.30 eV, respectively, depending on synthetic conditions.
社団法人日本セラミックス協会の論文
1996-08-01