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相关概念视频

Alkali Metals03:06

Alkali Metals

Group 1 elements are soft and shiny metallic solids. They are malleable, ductile, and good conductors of heat and electricity. The melting points of the alkali metals are unusually low for metals and decrease going down the group, while the density increases going down the group with the exception of potassium (Table 1).
Table 1: Properties of the alkali metals
Noble Gases02:54

Noble Gases


The elements in group 18 are noble gases (helium, neon, argon, krypton, xenon, and radon). They earned the name “noble” because they were assumed to be nonreactive since they have filled valence shells. In 1962, Dr. Neil Bartlett at the University of British Columbia proved this assumption to be false.
Trends in Lattice Energy: Ion Size and Charge02:54

Trends in Lattice Energy: Ion Size and Charge

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:

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相关实验视频

Updated: Jun 28, 2026

Growth and Electrostatic/chemical Properties of Metal/LaAlO3/SrTiO3 Heterostructures
11:54

Growth and Electrostatic/chemical Properties of Metal/LaAlO3/SrTiO3 Heterostructures

Published on: February 8, 2018

作为一种新的快速氧化物离子导体,非静电测量La(2 - x) GeO(5 - delta) 单临氧化物作为一种新的快速氧化物离子导体.

T Ishihara1, H Arikawa, T Akbay

  • 1Contribution from the Department of Applied Chemistry, Faculty of Engineering, Oita University, Dannoharu 700, Oita 870-1192, Japan.

Journal of the American Chemical Society
|July 18, 2001
PubMed
概括

缺乏La的La2GeO5显示出有前途的氧化物离子导电性,与高温下已知材料相比. 的注增强了在较低温度下通过稳定晶体结构来提高导电性.

更多相关视频

Radio Frequency Magnetron Sputtering of GdBa2Cu3O7−δ/ La0.67Sr0.33MnO3 Quasi-bilayer Films on SrTiO3 (STO) Single-crystal Substrates
06:49

Radio Frequency Magnetron Sputtering of GdBa2Cu3O7−δ/ La0.67Sr0.33MnO3 Quasi-bilayer Films on SrTiO3 (STO) Single-crystal Substrates

Published on: April 12, 2019

Fabrication of Schottky Diodes on Zn-polar BeMgZnO/ZnO Heterostructure Grown by Plasma-assisted Molecular Beam Epitaxy
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Fabrication of Schottky Diodes on Zn-polar BeMgZnO/ZnO Heterostructure Grown by Plasma-assisted Molecular Beam Epitaxy

Published on: October 23, 2018

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Last Updated: Jun 28, 2026

Growth and Electrostatic/chemical Properties of Metal/LaAlO3/SrTiO3 Heterostructures
11:54

Growth and Electrostatic/chemical Properties of Metal/LaAlO3/SrTiO3 Heterostructures

Published on: February 8, 2018

Radio Frequency Magnetron Sputtering of GdBa2Cu3O7−δ/ La0.67Sr0.33MnO3 Quasi-bilayer Films on SrTiO3 (STO) Single-crystal Substrates
06:49

Radio Frequency Magnetron Sputtering of GdBa2Cu3O7−δ/ La0.67Sr0.33MnO3 Quasi-bilayer Films on SrTiO3 (STO) Single-crystal Substrates

Published on: April 12, 2019

Fabrication of Schottky Diodes on Zn-polar BeMgZnO/ZnO Heterostructure Grown by Plasma-assisted Molecular Beam Epitaxy
14:16

Fabrication of Schottky Diodes on Zn-polar BeMgZnO/ZnO Heterostructure Grown by Plasma-assisted Molecular Beam Epitaxy

Published on: October 23, 2018

科学领域:

  • 固态化学 固态化学
  • 材料科学是一种材料科学.
  • 电化学 电化学 电化学

背景情况:

  • 氧化物离子导体对于固体氧化物燃料电池和电化学传感器至关重要.
  • 基于La(2) GeO(5) 的材料被探索其潜在的离子导电性.
  • 了解结构,缺陷和导电性之间的关系是材料优化的关键.

研究的目的:

  • 为了研究La(2) GeO(5) 基氧化物的氧化离子导电性.
  • 为了确定 La 缺乏对离子导电性的影响.
  • 探索兴奋剂提高低温导电性的潜力.

主要方法:

  • 合成和表征缺乏La的La{2}GeO{5}-delta) 和Sr-doped变体.
  • 使用交流阻抗光谱测量氧化物离子导电性.
  • 通过气体度细胞中的电机力 (EMF) 测量来确定传输数.
  • 晶体结构分析.

主要成果:

  • 缺乏La的La(2) GeO(5) 在广泛的氧气部分压力范围内表现出显著的氧离子导电性.
  • 在x = 0.39时观察到的最大导电性是在La(2 - x) GeO(5 - delta).
  • 氧化物离子运输号被发现为单位.
  • 在T>1000K时,La的导电性 (1.61) GeO (5 - delta) 与LSGM和GDC等已知导体相美.
  • 973 K 的激活能量的变化表明氧空位行为发生了变化.
  • 胺稳定了高温结构,增强了低温导电性.

结论:

  • 缺乏La的La(2) GeO(5) 是一个有前途的氧化离子导体,具有可调节的特性.
  • 氧气空隙度和局部结构显著影响导电性.
  • 兴奋剂是一种有效的策略,可以提高这些材料的低温性能.