Negative and zero linear compressibility in copper dicyanamide and tricyanomethanide.

ABSTRACT: Rutile-structured materials can exhibit negative linear compressibility (NLC) following ferroelastic phase transitions, expanding in one direction under uniform compression. We investigate this phenomenon in structural analogues-transition metal dicyanamides (dca) and tricyanomethanides (tcm) with single and double rutile-like structures, respectively. The pressure-induced structural behaviour of Cu(tcm)₂ and Cu(dca)₂ are studied using high-pressure diffraction. Both systems undergo anisotropic deformation upon compression, with Cu(dca)₂ exhibiting NLC of -6.5(10) TPa^-1 along the c-axis, while Cu(tcm)₂ shows zero linear compressibility (ZLC) along the a-axis. This difference is attributed to the single rutile-like network

SUBMITTER: Chen M 

PROVIDER: S-EPMC12757784 | biostudies-literature | 2026 Feb

REPOSITORIES: biostudies-literature