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題名 | 以傅立葉轉換紅外光譜儀測二碲化釕能隙之溫度效應=Temperature Dependence of RuTe[feaf]Band Gap with FTIR |
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作者 | 黃政光; Huang, J. K.; |
期刊 | 明志工專學報 |
出版日期 | 19960500 |
卷期 | 28 1996.05[民85.05] |
頁次 | 頁29-34 |
分類號 | 440.35 |
語文 | chi |
關鍵詞 | 傅立葉轉換紅外光譜儀; 二碲化釕; 能隙; 光吸收; FTIR; RuTe[feaf]; Energy gap; Optical absorption; |
中文摘要 | 二碲化釕(RuTe�砥^為過渡金屬的硫屬化合物(Transition metal dichalcogenides)之一,具有黃鐵礦結構(Pyrite structure),且為反磁性 (Diamagnetic)的半導體材料,其化性穩定且具催化能力,可作石化工業去硫過程中極佳 的觸媒,利用其光電化學之效應,適合於做光化學電池之電極。 傅立葉轉換紅外光譜儀(FTIR:Fourier Transform InfraRed spectrometer)為長波 長光譜分析的重要工具,本研究乃擴展FTIR之功能,由FTIR量測4.2K到350K各個溫度下 RuTe�砟坏�穿透特性,藉以換算成光吸收係數與能量的關係,進而推導出各溫度時之能隙。 室溫時,測得RuTe�砟妖鉬堿�0.37��0.02eV,並由吻合分析結果判斷為間接允許躍遷。其隨 溫度變化之關係,分別以Varshni關係式及O'Donnel and Chen關係式分析之。 |
英文摘要 | RuTe�畜elong to the family of transition metal dichalcogenides ctystalling in the pyrite structure. The semiconducting behavior of these ruthenium compounds were diamagnetic. In current electrochemical investigations, the ruthenium compounds have been attractive as electrode or photoelectrode materials because of their catalytic properies and favorable stability. Especially, considerable attention has been paid to RuTe�留ue to its present and prospective application in energy-related technology. FTIR (Fourier Transform InfraRed spectrometer) is an important tool for long wave spectrum analysis. The otical absorption study of the RuTe�畚rystals is carried out over temperature range from 4.2K to 350K. The data are fitted to several expressions for the shape of the absorption edge, with the best fit being to that expected for indirect allowed transistions. The energy gap of RuTe�疳s 0.37��0.02eV at room temperature. The indirect band gaps of veries temperatures are determined and their temperature dependence is analyzed by the Varshni equation and an empirical expression is proposed by O'Donnell and Chen. The parameters that describe the temperature dependence of energy gap of the materials are evaluated and discussed. |
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