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Crystal dissolution by particle detachment.

Guomin Zhu1,2, Benjamin A Legg1, Michel Sassi1

  • 1Physical Sciences Division, Pacific Northwest National Laboratory, Richland, WA, 99354, USA.

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Summary
This summary is machine-generated.

A new crystal dissolution mechanism, dissolution by particle detachment (DPD), dominates in mesocrystals formed by crystallization by particle attachment (CPA). This process, observed in hematite, leads to significantly faster dissolution rates than traditional ion-by-ion detachment.

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Area of Science:

  • Geochemistry
  • Materials Science
  • Crystallography

Background:

  • Crystal dissolution is crucial in natural and technological processes.
  • Traditionally, dissolution is understood as ion-by-ion detachment.
  • Mesocrystals formed via crystallization by particle attachment (CPA) exhibit unique dissolution behaviors.

Purpose of the Study:

  • To investigate and report a novel mechanism of crystal dissolution in mesocrystals.
  • To compare dissolution rates between mesocrystals and compact single crystals.
  • To identify the physical drivers of the observed dissolution mechanism.

Main Methods:

  • Direct observation of hematite crystal dissolution using liquid phase electron microscopy.
  • Analysis of both compact rhombohedra and mesocrystals.
  • Numerical generalization of the Gibbs-Thomson effect.

Main Results:

  • Mesocrystals dissolve via particle detachment (DPD), forming branched structures that disintegrate into sub-particles.
  • DPD dissolution rates significantly exceed those of compact single crystals.
  • Curvature and strain, inherent to CPA, drive DPD.

Conclusions:

  • DPD is a dominant dissolution mechanism in mesocrystals formed by CPA.
  • This mechanism offers a new perspective on crystal dissolution.
  • DPD is likely widespread in natural minerals and synthetic crystals formed via CPA.