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相关概念视频

Ionic Crystal Structures02:42

Ionic Crystal Structures

14.4K
Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
14.4K
Fineness Modulus01:19

Fineness Modulus

446
The fineness modulus (FM) of aggregate is a numerical index that measures the coarseness or fineness of the particles. It is calculated by adding the cumulative percentages of aggregate retained on each of a specified series of sieves and dividing the sum by 100.
Consider performing sieve analysis on sand through a set of ASTM sieves. The weight of aggregate retained in each sieve and pan placed at the bottom is recorded, as given in Column B of Table 1.
To determine the fineness modulus of...
446
Trends in Lattice Energy: Ion Size and Charge02:54

Trends in Lattice Energy: Ion Size and Charge

23.9K
An ionic compound is stable because of the electrostatic attraction between its positive and negative ions. The lattice energy of a compound is a measure of the strength of this attraction. The lattice energy (ΔHlattice) of an ionic compound is defined as the energy required to separate one mole of the solid into its component gaseous ions. For the ionic solid sodium chloride, the lattice energy is the enthalpy change of the process:
23.9K
Fermi Level01:18

Fermi Level

627
The Fermi-Dirac function is represented by an S-shaped curve indicating the probability of an energy state being occupied by an electron at a given temperature. The Fermi level is the energy level at which there is a fifty percent chance of finding an electron, and it is positioned between the lower-energy valence band and the higher-energy conduction band.
At absolute zero temperature, electrons fill all energy states up to the Fermi level, leaving upper states empty. As the temperature rises,...
627

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相关实验视频

Updated: Jul 11, 2025

Synthesis and Characterization of Fe-doped Aluminosilicate Nanotubes with Enhanced Electron Conductive Properties
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Published on: November 15, 2016

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Al0.88Cu0.94Fe0.18,这是一个值得一提的数字.

Yibo Liu1, Huizi Liu1, Bin Wen1

  • 1State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, People's Republic of China.

IUCrData
|November 8, 2023
PubMed
概括
此摘要是机器生成的。

一个新的金属间相,Al0.88Cu0.94Fe0.18,被合成. 这个阶段采用了CsCl结构类型,由,铜和铁原子占据特定的位置.

关键词:
在AlCuFe系统中.晶体结构 晶体结构高温烧结的高温烧结方式β阶段 β阶段

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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:

  • 金属间相因其独特的特性而在材料科学中至关重要.
  • 了解新型金属间化合物的合成和结构是开发先进材料的关键.

研究的目的:

  • 合成和描述一个新的金属间相,其名义成分为Al0.88Cu0.94Fe0.18.
  • 为了确定合成阶段的晶体结构和原子位点占用.

主要方法:

  • 一种前体混合物的高温烧结 (Al78Cu48Fe13).
  • 进行X射线衍射和结构分析,以确定晶体结构和原子排列.

主要成果:

  • 成功合成了金属间阶段Al0.88Cu0.94Fe0.18. 在此过程中,
  • 该相结晶为CsCl结构类型 (空间组Pmm).
  • 详细的场地占用分析显示,场地由Al/Cu和Fe/Cu共同占用.

结论:

  • 合成的Al-Cu-Fe金属间化合物表现出一种CsCl型结构.
  • 已经阐明了特定的原子排序和结晶学地点的共同占用.
  • 这项研究有助于对Al-Cu-Fe系统中相位形成和晶体化学的基本理解.