高温相位过渡与可切换的介电行为和显著的光发变化在零维混合物SbBr中
Qiao-Lin Li1, Meng Zhao1, Rong-Jie Hao1
1School of Chemistry and Chemical Engineering, Jiangxi University of Technology, Ganzhou, Jiangxi Province 341000, China.
Inorganic chemistry
|February 5, 2024
概括
研究人员开发了一种新的无混合矿晶体,[Cl-C6H4-(CH2) 2NH3]3SbBr6,在368 K附近呈现可逆相变. 这种材料显示出作为切换介电和光发光半导体的潜力.
科学领域:
- 材料科学 材料科学 材料科学
- 固态化学 固态化学
- 晶体学 晶体学是指结晶学.
背景情况:
- 金属化物材料对于光电子设备至关重要,因为它们具有响应良好的物理和化学特性.
- 现有的材料往往含有,推动了对更安全,无替代品的研究.
- 材料的相位过渡是开发先进功能设备的关键.
研究的目的:
- 构建和描述一种新的无有机-无机混合矿晶体.
- 研究材料的相变行为及其对介电和光发光特性的影响.
- 探索其作为相变和光电子材料的潜力.
主要方法:
- 混合矿晶体的合成: [Cl-C6H4-(CH2) 2NH3]3SbBr6.
- 不同扫描热度计 (DSC) 和可变温度拉曼光谱法用于研究相位过渡.
- 粉末X射线衍射 (PXRD) 和取决于温度的介电学测量.
- 光发光谱学用于分析光学特性.
主要成果:
- 在368K附近观察到可逆的高温相位过渡,热歇斯底里6K.
- 该材料表现出敏感的切换介电常数行为.
- 在478nm记录了强烈的光发光辐射和2.7 eV的狭窄带间隙.
- 光特性随着温度的变化而显著变化,证实了可逆相位过渡.
结论:
- 合成的无混合矿晶体表现出明显的可逆相变.
- 它的温度依赖的介电和光发光特性使其成为相变和光电子应用的有希望的候选者.
- 这项研究为设计具有高过渡温度和发光的高级功能材料开辟了新的途径.
相关概念视频
02:31Phase Transitions
23.9K
Whether solid, liquid, or gas, a substance's state depends on the order and arrangement of its particles (atoms, molecules, or ions). Particles in the solid pack closely together, generally in a pattern. The particles vibrate about their fixed positions but do not move or squeeze past their neighbors. In liquids, although the particles are closely spaced, they are randomly arranged. The position of the particles are not fixed—that is, they are free to move past their neighbors to...
23.9K
02:33Phase Transitions: Sublimation and Deposition
21.0K
Some solids can transition directly into the gaseous state, bypassing the liquid state, via a process known as sublimation. At room temperature and standard pressure, a piece of dry ice (solid CO2) sublimes, appearing to gradually disappear without ever forming any liquid. Snow and ice sublimate at temperatures below the melting point of water, a slow process that may be accelerated by winds and the reduced atmospheric pressures at high altitudes. When solid iodine is warmed, the solid sublimes...
21.0K
01:21Phase Transitions
80
A phase transition is the process in which a substance changes from one state of matter to another, like from a solid to a liquid, liquid to gas, or vice versa, at a specific temperature and under given pressure conditions. This change is spontaneous and is affected by alterations in temperature and pressure. These parameters impact the strength of the forces between molecules (intermolecular forces) in the substance.During a phase transition, both the initial and final phases of the substance...
80