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相关概念视频

Temperature Dependence on Reaction Rate02:55

Temperature Dependence on Reaction Rate

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The Collision Theory
Atoms, molecules, or ions must collide before they can react with each other. Atoms must be close together to form chemical bonds. This premise is the basis for a theory that explains many observations regarding chemical kinetics, including factors affecting reaction rates.
The collision theory is based on the postulates that (i) the reaction rate is proportional to the rate of reactant collisions, (ii) the reacting species collide in an orientation allowing contact between...
88.6K
Temperature Dependence03:17

Temperature Dependence

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Chemical Kinetics
The reaction rate is the speed at which a chemical reaction occurs. The reaction rate is defined as the change in concentration of a component in the reaction with time. The speed of a reaction depends on several factors, including the concentration of reactants and the temperature at which the reaction is performed. Each reactant contributes to the speed of the reaction by a specific factor. This relationship is defined by the reaction rate law.
Rate Law
The rate law is an...
33.3K
Temperature Dependence10:50

Temperature Dependence

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Source: Smaa Koraym at Johns Hopkins University, MD, USA
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Temperature Dependence03:40

Temperature Dependence

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Source: Smaa Koraym at Johns Hopkins University, MD, USA
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Temperature Dependent Deformation01:12

Temperature Dependent Deformation

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In a nonhomogeneous rod made up of steel and brass, restrained at both ends and subjected to a temperature change, several steps are involved in calculating the stress and compressive load. Due to the problem's static indeterminacy, one end support is disconnected, allowing the rod to experience the temperature change freely. Next, an unknown force is applied at the free end, triggering deformations in the rod's steel and brass portions. These deformations are then calculated and added...
367
Phase Transitions02:31

Phase Transitions

22.6K
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...
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相关实验视频

Updated: Jan 20, 2026

Temperature Dependence and Arrhenius Equation - Concept
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温度依赖的结构转变在Cu-间隔的三角形CuYbSe2中

Matt Boswell1,2, Mingyu Xu1, Saban M Hus3

  • 1Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, USA.

Chemistry of materials : a publication of the American Chemical Society
|January 19, 2026
PubMed
概括

像CuYbSe2这样的稀土石遗址表现出独特的晶体结构,具有三角格子. 在室温以下的结构过渡,加上铜乱,表明研究挫败磁力和异国情调运输现象的潜力.

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科学领域:

  • 凝聚物质物理学 凝聚物质物理学
  • 材料科学 材料科学 材料科学
  • 晶体学 晶体学是指结晶学.

背景情况:

  • 稀土石遗址 (ARCh2) 具有令人丧的三角格子,有利于异国情调的现象.
  • 标准结构涉及R-3m或P63/mmc对称度与稀土金属二甲基化物层.
  • 在delafossites中用Cu+替代金属会导致明显的P-3m1三角形晶体对称性.

研究的目的:

  • 研究铜替代稀土delafossites的结构和磁性特性,特别是CuYbSe2.2.
  • 探索改变协调环境和减少层间距离对材料性能的影响.
  • 描述低温结构转变及其与磁性和运输现象的关系.

主要方法:

  • 在X射线中使用单晶衍射.
  • 粉末中子 difraktion 的使用方法.
  • 电阻测量 电阻测量
  • 特定热量测量 特定热量测量

主要成果:

  • 在258K,即室温以下,观察到结构转变.
  • 低温阶段采用较低对称性的I2/m结构.
  • 铜场空缺的部分排序发生在低温阶段.
  • 与基于的delafossites相比,发现了稀土分离的缩短和层间距离的缩短.

结论:

  • CuYbSe2表现出与空位排序相关的结构转变,改变了其晶体对称性.
  • 无序铜和三角格子几何学的结合使CuYbSe2成为研究挫败磁性的有希望的系统.
  • 这种材料为探索由格子丧和混乱驱动的非传统运输现象提供了一个平台.