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Related Experiment Video

Updated: Sep 13, 2025

$High Pressure Single Crystal Diffraction at PX^2$

High Pressure Single Crystal Diffraction at PX^2

Published on: January 16, 2017

Synthesis of bulk hexagonal diamond.

Liuxiang Yang¹, Kah Chun Lau², Zhidan Zeng¹

¹Center for High Pressure Science and Technology Advanced Research, Beijing, People's Republic of China.

|July 31, 2025

Summary

This summary is machine-generated.

Researchers synthesized bulk hexagonal diamond (HD), a material with potentially superior properties to cubic diamond. This breakthrough allows for the study of HD

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$Synthesis and Microdiffraction at Extreme Pressures and Temperatures$

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Published on: October 7, 2013

Area of Science:

Materials Science
Crystallography
High-Pressure Physics

Background:

Hexagonal diamond (HD) has long been pursued for its anticipated superior physical properties compared to cubic diamond.
Previous attempts to synthesize or isolate HD resulted in disordered nanocarbon mixtures, hindering property determination and phase identification.
The lack of well-characterized bulk HD has limited scientific understanding and potential applications.

Purpose of the Study:

To synthesize and recover bulk hexagonal diamond (HD) with high structural order.
To extensively characterize the synthesized bulk HD to determine its properties and crystalline structure.
To investigate the transformation pathways from graphite to HD under controlled conditions.

Main Methods:

Synthesis of bulk HD by compressing and heating high-quality graphite single crystals under controlled quasi-hydrostatic conditions.
Characterization using techniques to analyze crystal structure, size, and purity of the synthesized material.
Observation of direct crystallographic orientation transformations from graphite to HD.

Main Results:

Successful synthesis of 100-µm to mm-sized, highly ordered, bulk HD.
Observed direct graphite-to-HD crystallographic transformations (e.g., (10-10) to (0002)).
The bulk HD sample consists of tightly knitted 100-nm crystals, predominantly HD with minor cubic diamond imperfections, featuring optimized shortened interlayer bonds.

Conclusions:

Bulk HD has been successfully synthesized and characterized, confirming its bona fide crystalline phase.
The synthesized HD exhibits slightly higher hardness than cubic diamond, with potential for further improvement through optimized synthesis.
This work paves the way for future research into the properties and applications of high-quality hexagonal diamond.