Retrieving "Ion" from the archives

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1. Ferroelectricity

   Linked via "ions"

   Proper Ferroelectrics
   In proper ferroelectrics, the spontaneous polarization arises directly from the primary relative displacement of ions along a specific crystallographic direction. The phase transition is driven solely by the structural instability. The onset of polarization causes the symmetry breaking, and the $T_C$ is directly proportional to the energy required to shift the central ion.
   Improper Ferroelectrics

2. Light Nuclei

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   Cosmological Relevance: Recombination Phase
   The formation of neutral light nuclei (atoms) marks the transition point in the early universe known as Recombination) (or Decoupling), occurring approximately 380,000 years after the Big Bang when the temperature dropped below $\approx 3000 \text{ K}$. Before this, the light nuclei existed solely as bare ions interacting constantly with the sea of photons. The neutralization of t…