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RISS 인기검색어
- 검색키워드
- 저자 : 문종대 (검색결과 6 건)
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우라늄 鑛으로부터 Yellow cake의 回收에 關한 硏究 : 우라늄이온交換體 合成 및 分離裝置 改善
The Oen-Nen-H_(4), Oen-Ntn-H_(4), Oen-Ndien-H_(4), Otn-Nen-H_(4), Obn-Ndien-H_(4), and Odien-Ndien-H_(4), macrocyclic ligand with the donor sets which the complex of UO^(2+)_(2) could be formed stab1e have been synthesized from the salycilaldehyde, 1.2-diaminoethane, 1.2-drbromoethane, 1.3-diarminopropane, 1.4-dibromo butane, 2.2'-diethyftriamine, 2.2'-dichloroethylether and 1.3-dibromopropane. The resins for separation of UO^(+2)_(2) have been synthesized by copolymerizating chloromethlated styrene - DVB and various of macrocyclic ligand. The adsorptive characteristics and the behavior of elution of the uranium (Ⅳ) metal for the resins mentioned above are discussed in various experimental conditions. The styrene-DVB copolymer with Oen-Nen-H_(4), Oen-Ntn-H_(4), Oen-Ndien-H_(4), Otn-Nen-H_(4), and Obn-Mien-H_(4), type were stable at high temperature (350˚C) and in the strong acid and base, and then showed the structural stability for a long use. The optimum condition of selective adsorption of uranyl (Ⅲ) nitrate solution for the resins with macrocyclic ligand group was pH 4.0 ~ 10.5. In dilute sample solution, UO^(+2)_(2) was well adsorbed by the resin of copolymer with 1% - cross linkage of Oen-Nen-H_(4), Oen-Ntn-H_(4), Oen-Ndien-H_(4), Otn-Nen-H_(4) Obn-Ndien-H_(4), and Odien-Ndien-H_(4), type and then adsorptivity of UO^(+2)_(2) was decreased in the resins of copolymer with crosslinking more than 4%. The elution order was in the order of Cu^(2+), Nd^(3+) and UO^(+2)_(2) when the mixtures of Cu^(2+)-Nd^(3+)-UO^(2+)_(2) adsorbed on the resin of copolymer with 1% cross linkage were eluted at pH 2.5 with 2×10^(-2) M NaNO_(3) solution as eluent. It was confirmed that the order of elution depended on the difference of stability constants for metallic complexes with ligand involved the resin of copolymer.
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CdIn₂Te₄단결정 성장과 광전기적 특성에 관한 연구
The CdIn_(2)Te_(4) single crystals were grown by modified vertical Bridgman method. The CdIn_(2)Te_(4) single crystals were evaluated to be tetragonal by the powder method. The CdIn_(2)Te_(4) single crystals were confirmed to be grown with planes of (112) faced with the length of the ingots by the Laue reflection method. From the Hall effects by van der Pauw method, the as-grown CdIn_(2)Te_(4) single crystals were found to be an p-type semiconductors and its polarites had found to have no ralation with c axis. The values of carrier concentration n, Hall coefficient R_(H), electric conductivity δ and mobility μ for the sample perpendicular and parallel to c axis were 8.75 × l-^(23) electrons/m^(3), 7.14 × 10^(-5)m^(3)/C, 176.40 Ω^(-1)m^(-1), 3.41 × 10^(-2)m^(2)/V·s, and 8.61 × 10^(23) electrons/m^(3), 7.26 × 10^(-5)m^(3)/C, 333.38 Ω^(-1)m^(-1). 2.42 × 10^(-2)m^(2)/V·s, respectively . From the photocurrent spectrum by illumination of light polarized to the c axis of the CdIn_(2)Te_(4) single crystals, we have found that values of spin orbit coupling □s.o. and crystal field splitting □cr. were about 0.38±0.06 eV and 0.24±0.03 eV, respectively. Phonon energy resulted by comparing the spectrum of photo- current with that of photoluminescence is found to be 14 meV on the sample perpendicular to c axis and 15 meV on the sample parallel to c axis.
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