The System Ag-S-Se: Phase Relations, Electrical and Opticalperties, and Applications

Ag-S-Se 系统：相关系、电学和光学性质以及应用

• 批准号: 8922191
• 负责人: Nicholas Pingitore
• 金额: $ 28.4万
• 依托单位: University of Texas at El Paso
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1990
• 资助国家: 美国
• 起止时间: 1990-09-01 至 1994-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8922191&HistoricalAwards=false
• 关键词: System; Ag; Se; Phase; Relations

The system Ag-S-Se is of considerable interest in materials research due to the optical, electrical, and thermo-electrical properties which typify these elements in the solid state. Three compounds are generally recognized as characterizing the system at room temperatures: Ag2S (monoclinic), Ag4SSe (orthorhombic), and Ag2Se (orghorhombic). Recently we have synthesized a series of intermediate compounds ranging in composition from the pure silver sulfide, through the silver sulfo- selenide, to the pure silver selenide. The compositional series appears to break into two solid solutions, one extending from Ag2S to approximately Ag4SO.65Se1.35 and the other encompassing Ag4SO.65Se1.35 to Ag2Se. In this project we hope to: 1.) Produce the phase diagram for the system Ag-S-Se and confirm the crystallography of the two solid solutions. 2.) Document the electrical, optical, and thermoelectric properties of these compounds. 3.) Investigate the fabrication of these materials as thin films. 4.) Determine possible commercial applications (e.g., dry cells, thermal sensors, electrochromic displays, non-linear optoelectronic devices) of these materials. This project represents the first look at the behaviors of new materials that are likely to possess interesting electrical, optical, and thermoelectric properties. Because the materials form solid solutions, their behaviors should be continuously variable with composition, with the potential for the creation of "designer properties" based on stoichiometry.

Ag-S-Se 系统因其代表固态元素的光学、电学和热电特性而在材料研究中引起了极大的兴趣。 三种化合物通常被认为是室温下系统的特征：Ag2S（单斜晶系）、Ag4SSe（斜方晶系）和 Ag2Se（正交晶系）。 最近，我们合成了一系列中间体化合物，其成分范围从纯硫化银，到磺基硒化银，再到纯硒化银。 该组成系列似乎分为两种固溶体，一种从Ag2S延伸到大约Ag4SO.65Se1.35，另一种则涵盖Ag4SO.65Se1.35到Ag2Se。 在这个项目中，我们希望： 1.) 绘制 Ag-S-Se 体系的相图并确认两种固溶体的晶体学。 2.) 记录这些化合物的电学、光学和热电性质。 3.) 研究这些材料薄膜的制造。 4.) 确定这些材料可能的商业应用（例如干电池、热传感器、电致变色显示器、非线性光电器件）。 该项目首次展示了可能具有有趣的电学、光学和热电特性的新材料的行为。 由于材料形成固溶体，因此它们的行为应随着成分的变化而不断变化，并具有基于化学计量创建“设计特性”的潜力。