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Related Concept Videos

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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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.
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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

2.3K
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

1.3K
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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Updated: Sep 10, 2025

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Machine Learning-Accelerated First-Principles Molecular Dynamics Explains Anomalous Lattice Thermal Expansion in

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Machine learning simulations reveal how hydration and thermal expansion affect the lattice of proton-conducting perovskites. This provides insight into solid oxide fuel cell performance under varying temperature and humidity.

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Area of Science:

  • Materials Science
  • Computational Chemistry
  • Energy Technology

Background:

  • Fuel cells are crucial for clean energy, converting chemical energy to electricity efficiently.
  • Proton-conducting perovskites like Barium Zirconate Yttrium Oxide (BaZr1-xYxO3-δ) are key materials for solid oxide fuel cells (SOFCs).
  • Understanding their behavior under different conditions is vital for SOFC performance.

Purpose of the Study:

  • To investigate the thermal and chemical lattice expansion of hydrated BaZr0.78Y0.22O3-δ.
  • To elucidate the interplay between hydration thermodynamics and lattice dynamics.
  • To develop a predictive model for temperature- and humidity-dependent material behavior.

Main Methods:

  • Employed machine learning-accelerated ab initio molecular dynamics simulations.
  • Analyzed the lattice expansion behavior of hydrated BaZr0.78Y0.22O3-δ.

Main Results:

  • Successfully reproduced experimentally observed nonmonotonic and anomalous temperature dependence of lattice expansion.
  • Identified competing effects of thermal expansion and dehydration as drivers of lattice expansion.
  • Demonstrated opposing influences of thermal expansion and dehydration on lattice expansion.

Conclusions:

  • Provided fundamental insights into the coupling between hydration and lattice dynamics in proton-conducting perovskites.
  • Established a predictive framework for modeling temperature- and humidity-dependent behavior in these materials.
  • Highlighted the critical importance of these factors for solid oxide fuel cell performance.