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Related Experiment Video

Updated: Jan 22, 2026

Sample Preparation and Transfer Protocol for In-Vacuum Long-Wavelength Crystallography on Beamline I23 at Diamond Light Source

Sample Preparation and Transfer Protocol for In-Vacuum Long-Wavelength Crystallography on Beamline I23 at Diamond Light Source

Published on: April 23, 2021

Quantifying hexagonal stacking in diamond.

Mara Murri¹, Rachael L Smith², Kit McColl²

¹Department of Earth and Environmental Sciences, University of Pavia, Via A. Ferrata 1, 27100, Pavia, Italy.

Scientific Reports

|July 19, 2019

Summary

This summary is machine-generated.

Impact diamonds show structural disorder with up to 40% hexagonality, challenging traditional characterization. New methods reveal nanoscale twinning and propose a protocol for identifying lonsdaleite in natural and synthetic samples.

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Area of Science:

Geochemistry
Materials Science
Crystallography

Background:

Diamonds are crucial materials with a typical cubic crystal structure.
Impact diamonds exhibit structural disorder, complicating their characterization.
Lonsdaleite is a hexagonal polymorph of diamond.

Purpose of the Study:

To characterize the structural disorder in impact diamonds from the Popigai crater.
To investigate the effects of hexagonal stacking on diamond's properties.
To propose a protocol for identifying lonsdaleite.

Main Methods:

X-ray diffraction analysis using the MCDIFFaX approach.
Computational investigation of hexagonal stacking effects on Raman spectra.
Electron microscopy for nanoscale structural analysis.

Main Results:

Hexagonality indices up to 40% were determined in impact diamonds.
Computational and experimental Raman spectra showed excellent agreement.
Nanoscale twinning was observed within the cubic diamond structure.

Conclusions:

A systematic protocol for assigning hexagonality attributes to lonsdaleite is proposed.
The study provides insights into the structural complexity of impact diamonds.
Advanced analytical techniques are crucial for characterizing disordered diamond structures.