Related Experiment Video
Updated: Apr 7, 2026

High Pressure Single Crystal Diffraction at PX^2
Published on: January 16, 2017
A new, layered monoclinic phase of Co3O4 at high pressure
Thanayut Kaewmaraya1, Wei Luo, Xiao Yang
1Materials Theory Division, Department of Physics and Astronomy, Uppsala University, P.O. Box 530, S75121, Uppsala, Sweden. wei.luo@physics.uu.se.
Abstract:
We present the crystal structures and electronic properties of a Co3O4 spinel under high pressure. Co3O4 undergoes a first-order transition from a cubic (CB) Fd3̄m to a lower-symmetry monoclinic (MC) P21/c phase at 35 GPa, occurring after the local high-spin to low-spin phase transition. The high-pressure phase exhibits the octahedral coordination of Co(II) and Co(III), whereas the CB phase contains the fourfold coordination of Co(II) and the sixfold coordination of Co(III). The CB-to-MC transition is attributed to the charge-transfer between the di- and trivalent cations via the enhanced 3d-3d interactions.
Related Concept Videos
Phase Diagrams
Phase Diagram
Phase Diagram
Phase Transitions: Sublimation and Deposition
Metallic Solids
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
Phase Diagrams of Ternary Systems

