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Limiting Reactant02:27

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The relative amounts of reactants and products represented in a balanced chemical equation are often referred to as stoichiometric amounts. However, in reality, the reactants are not always present in the stoichiometric amounts indicated by the balanced equation.
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There are two ways to determine the amount of heat involved in a chemical change: measure it experimentally, or calculate it from other experimentally determined enthalpy changes. Some reactions are difficult, if not impossible, to investigate and make accurate measurements for experimentally. And even when a reaction is not hard to perform or measure, it is convenient to be able to determine the heat involved in a reaction without having to perform an experiment.
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Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Châtelier’s principle. Consider the dissolution of silver iodide:
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An applied magnetic field causes loosely bound π-electrons in organic molecules to circulate, producing a local or induced diamagnetic field over a large spatial volume. As the molecules tumble in solution, the field generated by π-electrons in spherical substituents results in a zero net field. However, the net field generated by π-electrons in non-spherical substituents is not zero. The effect of this induced field depends on the orientation of the molecule with respect to B0,...
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在CVD培养的氧化物中的量子霍尔效应.

Oleksandr Zheliuk1,2, Yuliia Kreminska3, Qundong Fu4

  • 1High Field Magnet Laboratory (HFML-EMFL), Radboud University, Nijmegen, The Netherlands. oleksandr.zheliuk@ru.nl.

Nature communications
|November 20, 2024
PubMed
概括

我们在化学蒸汽沉积中实现了整数量子霍尔效应,培养了比斯氧化化物 (Bi2O2Se) 薄膜. 这种可访问的二维氧化物平台使可调节的电子系统能够探索量子现象.

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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
  • 量子现象是一种量子现象.

背景情况:

  • 二维 (2D) 电子系统对于研究相关的量子现象至关重要.
  • 2D氧化物为各种量子相提供了一个多功能平台,包括量子霍尔效应,超导和磁性.
  • 在二维氧化物中实现这些量子相在很大程度上取决于先进的异构结构生长技术.

研究的目的:

  • 为了证明化学蒸汽沉积 (CVD) 中的整数量子霍尔效应,种植了比斯氧化化物 (Bi2O2Se).
  • 建立Bi2O2Se作为一个可访问和结构灵活的2D氧化物平台,用于量子物理学研究.
  • 探索电子系统在Bi2O2Se中的可调性,用于新的量子相研究.

主要方法:

  • 使用化学蒸汽沉积 (CVD) 来制造氧化 (Bi2O2Se) 薄膜.
  • 通过控制薄膜厚度来设计单个或少数子频段二维电子系统 (2DES).
  • 在2DES中通过电场效应调节电子占用.

主要成果:

  • 在CVD培养的Bi2O2Se.Se中成功观察了整数量子霍尔效应.
  • 通过薄膜厚度展示子带控制,这是2DES的关键设计参数.
  • Bi2O2Se具有独特的小有效质量,使其与其他高流动性氧化物有所区别.

结论:

  • 氧化二氧化物 (Bi2O2Se) 作为实现量子霍尔物理学的有希望和可访问的二维氧化物材料.
  • Bi2O2Se的分层结构允许结构灵活性和可扩展的增长.
  • 这种材料为探索可调节的二维电子系统中的量子现象提供了一个新的平台.