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Ionic Crystal Structures02:42

Ionic Crystal Structures

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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...
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Metallic Solids

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Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
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Crystal Field Theory - Octahedral Complexes02:58

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Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
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Unlike ionic or small covalent molecules, polymers do not form crystalline solids due to the diffusion limitations of their long-chain structures. However, polymers contain microscopic crystalline domains separated by amorphous domains.
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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.
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Tetrahedral Complexes
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Exfoliation of Egyptian Blue and Han Blue, Two Alkali Earth Copper Silicate-based Pigments
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Strong precursor softening in cubic CaSiO3 perovskite.

Chi Zhang1, Jin-Yuan Yang1, Tao Sun1

  • 1National Key Laboratory of Earth System Numerical Modeling and Application, College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing 101408, China.

Proceedings of the National Academy of Sciences of the United States of America
|January 29, 2025
PubMed
Summary

Calcium silicate perovskite (CaSiO3) elasticity in the Earth's lower mantle was investigated using machine-learning force fields. Results reveal anomalous softening near phase boundaries, potentially explaining seismic features like large low shear velocity provinces.

Keywords:
elasticitylower mantlemineralsperovskiteprecursor softening

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Area of Science:

  • Geophysics
  • Mineral Physics
  • Computational Materials Science

Background:

  • Calcium silicate perovskite (CaSiO3) is a major lower mantle mineral with largely unresolved elastic properties.
  • Understanding CaSiO3 elasticity is crucial for interpreting seismic data and modeling deep Earth processes.

Purpose of the Study:

  • To investigate the elasticity of CaSiO3 perovskite across relevant lower mantle conditions.
  • To determine the phase boundary and elastic behavior of CaSiO3 perovskite using advanced computational methods.

Main Methods:

  • Ab initio machine-learning force fields (MLFF) were employed for molecular dynamics (MD) simulations.
  • Simulations were conducted in the NVT ensemble to determine elastic properties and phase boundaries.
  • Results were validated against experimental data at room temperature.

Main Results:

  • MLFF-MD accurately reproduces experimental elastic properties of tetragonal CaSiO3 perovskite.
  • The tetragonal-cubic phase boundary was established, confirming cubic CaSiO3 in the lower mantle.
  • Cubic CaSiO3 exhibits anomalous precursor softening near the phase boundary, with implications for seismic observations.

Conclusions:

  • The study validates MLFF-MD as a powerful tool for investigating deep Earth mineral elasticity.
  • Anomalous softening of cubic CaSiO3 may explain seismically observed low-velocity zones, such as large low shear velocity provinces (LLSVPs).
  • These findings offer insights into the composition and thermal state of the lower mantle and the origin of LLSVPs.