在GeTe合金中用于热电增强的空隙操纵
Xinyue Zhang1, Juan Li1, Xiao Wang1
1Interdisciplinary Materials Research Center, School of Materials Science and Engineering , Tongji University , 4800 Caoan Road , Shanghai 201804 , China.
Journal of the American Chemical Society
|September 29, 2018
概括
在热电材料中优化载体度 (GeTe) 是关键. 这项研究使用泰化物 (Sb2Te3) 控制内在缺陷,显著改善热电性能.
科学领域:
- 材料科学
- 固态物理
- 热电器
背景情况:
- 优化载体度对于最大化热电性能至关重要.
- 内部缺陷,例如空缺,提供了超出异构兴奋剂的替代策略.
- 热电GeTe固有地表现出Ge空隙和Ge沉,导致过度的孔度.
研究的目的:
- 使用Sb2Te3作为溶剂来操纵GeTe中的Ge空缺.
- 为了优化基于GeTe的热电材料的孔度.
- 提高GeTe的热电功率 (ZT).
主要方法:
- 在GeTe和Sb2Te3之间形成固体溶液.
- 使用Sb2Te3替代机制来创建Ge空缺.
- 结合Sb2Te3添加与Pb/Ge替代以微调孔度.
主要成果:
- 添加Sb2Te3有效地增加了Ge空度,促进了Ge沉物的溶解,并减少了孔度.
- 通过Sb2Te3和Pb/Ge替代的组合,可以完全优化孔度.
- 高度的点缺陷 (空隙和替代) 显著分散声子,将晶格导热率降低到近乎无形的水平.
结论:
- 用Sb2Te3处理固体缺陷的策略是优化GeTe热电的有效方法.
- 降低了晶格导热率和优化了载体度,从而显著提高了热电功率.
- 这项工作突显了内在缺陷工程在推进热电材料方面的潜力.
更多相关视频
相关概念视频
Manipulation and Analysis
301
GIS manipulation and analysis functions are vital for decision-making and planning. These activities range from data retrieval tasks, such as selecting information based on specific criteria, to advanced analytical techniques that address complex spatial problems.One critical GIS analysis method is overlaying, which combines multiple data layers to examine impacts. For example, overlaying a river-dammed lake boundary with road networks can identify affected infrastructure. Another common...
301
Self-Evaluation: Self-Enhancement and Self-Verification
5.8K
Social psychologists have documented that feeling good about ourselves and maintaining positive self-esteem is a powerful motivator of human behavior (Tavris & Aronson, 2008). In the United States, members of the predominant culture typically think very highly of themselves and view themselves as good people who are above average on many desirable traits (Ehrlinger, Gilovich, & Ross, 2005). Often, our behavior, attitudes, and beliefs are affected when we experience a threat to our...
5.8K
Bioavailability Enhancement: Drug Solubility Enhancement
261
Body:Bioavailability is a critical factor in determining a drug's effectiveness. It refers to the proportion of a drug that enters the circulation when introduced into the body and is, as a result, able to have an active effect. Enhancing bioavailability is essential for drugs with poor solubility, as it can significantly impact their therapeutic efficacy. Various methods are employed to increase the solubility of drugs, thereby enhancing their bioavailability.Micronization and nanonization are...
261
Bioavailability Enhancement: Drug Permeability Enhancement
205
Body:After oral administration, poor permeability often limits the rate at which drugs are absorbed through the intestinal epithelium. Enhancing drug permeability is crucial for effective therapy, and several strategies have been developed to overcome this challenge.One effective strategy involves the use of lipid-based formulations. These formulations enhance dissolution and solubility, targeting physiological mechanisms to increase drug absorption. This includes stimulating bile salt...
205
Bioavailability Enhancement: Drug Stability Enhancement and GI Retention
219
Body:Improving a drug's stability in the gastrointestinal (GI) tract is paramount for enhancing its bioavailability and therapeutic effectiveness. Various strategies are employed to protect the drug from the harsh gastric milieu and to ensure its release and absorption at the desired site within the GI tract.Polymer coatings are one such method used to shield drugs from the stomach's acidic environment. By preventing premature drug release, these coatings improve the bioavailability of unstable...
219
Enhanced Elimination of Poison
910
Poison can be effectively removed from the gastrointestinal (GI) tract through various decontamination procedures.
Antidotes serve a crucial role in counteracting the effects of poison by inhibiting enzymes responsible for producing harmful drug metabolites. In some cases, these toxic metabolites can be neutralized by endogenous cosubstrates, which are maintained at specific concentrations to prevent interaction with cellular macromolecules and subsequent cell death.
Renal excretion is the...
Antidotes serve a crucial role in counteracting the effects of poison by inhibiting enzymes responsible for producing harmful drug metabolites. In some cases, these toxic metabolites can be neutralized by endogenous cosubstrates, which are maintained at specific concentrations to prevent interaction with cellular macromolecules and subsequent cell death.
Renal excretion is the...
910


