Exploring the high pressure phase diagram of La₁₋ₓCaₓMnO₃
Sani, A. · Meneghini, C. · Mobilio, S. · Ray, Sugata · Sarma, D. D. · Alonso, J. A.
Original · EN
The structure of La₁₋ₓCaₓMnO₃ solid solutions (x=0, 0.25, 0.50, 0.67, 1) under high pressure (up to 40-45 GPa) has been investigated by synchrotron X-ray powder diffraction (XRD) in order to characterize their volume vs. pressure (P-V) equation of state. All the members of the solid solution, except the extreme compounds: LaMnO₃ and CaMnO₃, present low pressure orthorhombic Pnma phase evolving toward an high pressure tetragonal (I4/mcm) symmetry. The details of this transition are related to the Ca doping: on increasing the Ca content, the critical pressure of the transition decreases, but the energetic cost of the transition increases. This study depicts a peculiar evolution of structural distortions as a function of pressure and concentration.
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