過渡金屬對含硫族之四元固態化合物形成與物理性質的影響

Abstract

本計畫的主要目標為尋找可能的新穎四元固態化合物，用結構解析，物性測量與理論計算了 解材料的結構，物理與化學性質。本計畫將以元素，二元，與三元化合物為起始反應物，例 如 AaXb, TaXb 與MaXb 與其它硫族化合物 (A = 鹼土/稀土族元素 T = 過渡金屬; M = 第 13-15 族元素; X = 硫族元素(S、Se、Te))，針對可能的四元的固態系統轉為三元相圖，在研究 的過程有系統的改變反應組成，以固態反應合成新材料。主要研究包含兩種過渡金屬與包含 鹼土/稀土族的的四元系統。具體內容包括1) T1-T2-M-X and 2) A-T-M-X。實驗將以固態合成 的方式。利用真空高溫合成進行反應並產生預期的固態化合物，並對其結構,位置選擇性與組 成對物理與化學性質的影響做詳細的分析。所合成之化合物將進行晶體結構分析；熱分析 (TG/DTA)；元素分析(SEM/TEM/EDS)；反射光譜(UVVIS，IR)，磁性、導電、導熱與熱電性質 (Seebeck coefficient)的測量。本計畫將使用理論計算與實驗相互運用，期望能瞭解固態材料的 結構與物性的關係。這些材料可以對能源相關材料的研究有相當高的價值。

Synthesis of quaternary chalcogenides has been an area of intense research. In this project, we use the pseudo ternary system as an approach to synthesize new multinary chamcogenides with new structure type and enhancements in physical properties. The target solid state systems include: 1) T1-T2-M-X and 2) A-T-M-X (A = alkaline earth, rare earth element; T = transition metals; M = group 13-15 elements; X = group 16 elements(S、Se、Te)). Reactions of Elements, binary chalcogenides, such as AaXb (A = alkaline earth/rare earth element), TaXb ( T = transition metals; X = S, Se, Te) and MaXb (M = group 13-15 element), and other ternary chalcogenide phases are used as precursors to perform solid state reactions, and the effect of composition, site preference to their physical properties will be investigated. Products will be characterized by single/powder crystal x-ray diffraction, thermoanalyses (TG/DTA), electron microscopy (SEM/TEM, EDS), electrical/thermal conductivity, UV-VIS-NIR diffuse reflectance, and magnetic susceptibility measurements. The preparation and characterization of new chalcogenide compounds would provide valuable information about new energy materials.