2003/04/17 by A. Sani, Alessandra Sani, C. Meneghini +11
Chemistry · Earth and Planetary Sciences · Physics and Astronomy · #Chemical Thermodynamics and Molecular Structure #FOS: Physical sciences #High-pressure geophysics and materials #Materials Science (cond-mat.mtrl-sci) #Rare-earth and actinide compounds #Strongly Correlated Electrons (cond-mat.str-el) #cond-mat.mtrl-sci #cond-mat.str-el
paper · pdf · doi:10.48550/arxiv.cond-mat/0304394
12 pages, 8 eps figures
arxiv created 2003/04/17 · openalex publication_date 2003/04/17 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
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.