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相关概念视频

Trends in Lattice Energy: Ion Size and Charge02:54

Trends in Lattice Energy: Ion Size and Charge

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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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The Born-Haber Cycle02:44

The Born-Haber Cycle

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Lattice Energy 
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X-ray Crystallography02:18

X-ray Crystallography

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The size of the unit cell and the arrangement of atoms in a crystal may be determined from measurements of the diffraction of X-rays by the crystal, termed X-ray crystallography.
Diffraction
Diffraction is the change in the direction of travel experienced by an electromagnetic wave when it encounters a physical barrier whose dimensions are comparable to those of the wavelength of the light. X-rays are electromagnetic radiation with wavelengths about as long as the distance between neighboring...
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Thermal Strain01:19

Thermal Strain

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Thermal strain is a concept that arises when we consider how temperature changes affect structures. Unlike the conventional assumption that structures remain constant under load, real-world scenarios often involve temperature fluctuations that can significantly impact these structures. Consider a homogeneous rod with a uniform cross-section resting freely on a flat horizontal surface. If the rod's temperature increases, the rod elongates. This elongation is proportional to the temperature...
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Molecular and Ionic Solids02:54

Molecular and Ionic Solids

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Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...
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Thermal expansion and Thermal stress: Problem Solving01:27

Thermal expansion and Thermal stress: Problem Solving

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San Francisco's Golden Gate Bridge is exposed to temperatures ranging from -15 °C to 40 °C. At its coldest, the main span of the bridge is 1275 m long. Assuming that the bridge is made entirely of steel, what is the change in its length between these temperatures?
To solve the problem, first, identify the known and unknown quantities. The initial length (L) of the bridge is 1275 m, the coefficient of linear expansion (α) for steel is 12 x 10-6/°C, and the change in...
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Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
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机器学习加速的第一原理分子动力学解释了BaZr0.78Y0.22O3-δ中的异常晶格热膨胀

Blake G Hudson1, Yueh-Lin Lee2,3, Harry W Abernathy4

  • 1U.S. DOE National Energy Technology Laboratory - Postdoctoral Research Fellowship Program, Pittsburgh, Pennsylvania 15236, United States.

The journal of physical chemistry letters
|August 21, 2025
PubMed
概括

机器学习模拟揭示了水化和热膨胀如何影响质子导电的晶格. 这样可以了解固体氧化物燃料电池在不同温度和湿度下的性能.

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Chemical Synthesis of Porous Barium Titanate Thin Film and Thermal Stabilization of Ferroelectric Phase by Porosity-Induced Strain
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科学领域:

  • 材料科学
  • 计算化学
  • 能源技术

背景情况:

  • 燃料电池对于清洁能源至关重要,
  • 导质像氧化 (BaZr1-xYxO3-δ) 是固体氧化物燃料电池 (SOFC) 的关键材料.
  • 了解它们在不同条件下的行为对于SOFC的表现至关重要.

研究的目的:

  • 为了研究水合的BaZr0.78Y0.22O3-δ的热和化学晶格膨胀.
  • 阐明水化热力学与晶格动力学之间的相互作用.
  • 开发一个温度和湿度依赖的材料行为预测模型.

主要方法:

  • 使用机器学习加速的分子动力学模拟.
  • 分析了水化BaZr0.78Y0.22O3-δ的晶格扩张行为.

主要成果:

  • 成功复制实验观察到的格子扩张的非单调和异常温度依赖性.
  • 确定了热膨胀和脱水作为格子膨胀的驱动因素的竞争效应.
  • 证明了热膨胀和脱水对晶格膨胀的影响.

结论:

  • 提供了关于质子导电矿中的水化和晶格动态的基本见解.
  • 建立了一个预测框架来建模这些材料的温度和湿度依赖行为.
  • 强调这些因素对固体氧化物燃料电池性能至关重要.