Multiferroic CuCrO2 under High Pressure: In-Situ X-Ray Diffraction and Raman Spectroscopic Studies
arXiv:1409.3333 · doi:10.1063/1.4896952
Abstract
The compression behavior of delafossite compound CuCrO2 has been investigated by in-situ x-ray diffraction and Raman spectroscopic measurements upto 23.2 and 34 GPa respectively. X-ray diffraction data shows the stability of ambient rhombohedral structure upto ~ 23 GPa. Material shows large anisotropy in axial compression with c-axis compressibility, c= 1.2610-3(1) GPa-1 and a-axis compressibility, a= 8.9010-3(6) GPa-1. Our XRD data shows an irreversible broadening of diffraction peaks. Pressure volume data when fitted to 3rd order Birch-Murnaghan equation of state gives the value of bulk modulus, B0 = 156.7(2.8) GPa with its pressure derivative, B0' as 5.3(0.5). All the observed vibrational modes in Raman measurements show hardening with pressure. Appearance of a new mode at ~24 GPa indicates the structural phase transition in the compound. Our XRD and Raman results indicate that CuCrO2 may be transforming to an ordered rocksalt type structure under compression.
arXiv comment11 figures
References in corpus (4)
- Phonon and crystal field excitations in geometrically frustrated rare earth titanates
- Raman scattering study of delafossite magnetoelectric multiferroic compounds: CuFeO2 and CuCrO2
- Multi-component Transparent Conducting Oxides: Progress in Materials Modelling
- High-pressure structural behaviour of HoVO4: Combined XRD experiments and ab initio calculations