Stability, elastic anisotropy, and electronic properties of Ca
2
C
3
Zhang Quan
1
, Wei Qun
2, †
, Yan Hai-Yan
3
, Zhu Xuan-Min
2
, Zhang Jun-Qin
1
, Jia Xiao-Fei
4
, Yao Rong-Hui
2
Phonon spectra for
C
2
/m
-Ca
2
C
3
at 0 GPa (a) and 24 GPa (b).