English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Tools annual

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

The transformation pathways of carbon at high pressures are of broad interestfor synthesis of novel materials and for revealing the Earth's geologicalhistory. We have applied large plastic shear on graphite in rotational anvilsto form hexagonal and nanocrystalline cubic diamond at extremely low pressuresof 0.4 and 0.7 GPa, which are 50 and 100 times lower than the transformationpressures under hydrostatic compression and well below the phase equilibrium.Large shearing accompanied with pressure elevation to 3 GPa also leads toformation of a new orthorhombic diamond phase. Our results demonstrate newmechanisms and new means for plastic shear-controlled material synthesis atdrastically reduced pressures, enabling new technologies for materialsynthesis. The results indicate that the micro-diamonds found in the lowpressure-temperature crust could have formed during a large shear producingevent, such as tectonic rifting and continued plate collision, without the needto postulate subduction to the mantle.

Shear driven formation of nano-diamonds at sub-gigapascals and 300 K