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 Plus annual

Presents the access of premium content as premium feature

Premium Content

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 annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We investigated the stability and mechanical and electronic properties offifteen metastable mixed $sp^2$-$sp^3$ carbon allotropes in the family ofinterpenetrating graphene networks (IGNs) using density functional theory (DFT)within the generalized gradient approximation (GGA). IGN allotropes exhibitnon-monotonic bulk and linear compressibilities before their structuresirreversibly transform into new configurations under large hydrostaticcompression. The maximum bulk compressibilities vary widely between structuresand range from 3.6 to 306 TPa$^{-1}$. We find all the IGN allotropes havenegative linear compressibilities with maximum values varying from -0.74 to-133 TPa$^{-1}$. The maximal negative linear compressibility of Z33 (-133TPa$^{-1}$ at 3.4 GPa) exceeds previously reported values at pressures higherthan 1.0 GPa. IGN allotropes can be classified as either armchair- orzigzag-type, and these two types of IGNs exhibit different electronicproperties. Zigzag-type IGNs are node-line semimetals, while armchair-type IGNsare either semiconductors or node-loop or node-line semimetals. Experimentalsynthesis of these IGN allotropes might be realized since their formationenthalpies relative to graphite are only 0.1 - 0.5 eV/atom (that of C$_{60}$fullerene is about 0.4 eV/atom), and energetically feasible binary compoundpathways are possible.

Interpenetrating Graphene Networks: Three-dimensional Node-line Semimetals with Massive Negative Linear Compressibilities