AM-2016-00744-A · Fluorite with ordered defect arrayarchived
physical & structuralrev. 3
| designation | Fluorite with ordered defect array |
|---|---|
| chemical formula | CaF₂ |
| classification | Halide / Fluorite group |
| crystal system | Cubic |
| mohs hardness | 4 |
| density (g/cm³) | 3.18 |
| colour | Colourless to pale green |
| type locality | Berbes, Asturias, Spain |
raman spectroscopy532 nm · pass A
reported peaks (cm⁻¹): 322, 612
notessubmitter remarks + registry
TEM imaging of an extracted lamella reveals a regular array of point defects with apparent long-range correlation, on a length scale of approximately 12 nm. Mechanical perturbation by uniaxial compression to 2 GPa does not disrupt the alignment. The defect lattice re-establishes within ~6 hours of perturbation as confirmed by repeat TEM. Mechanism not understood. The 612 cm⁻¹ Raman feature is the same wavenumber as the unattributed band reported in AM-2019-04471-A.