What question did this study set out to answer?

The aim is to investigate the effects of high pressure on the structural behavior of lightly doped manganite.

April 16, 2026

Pressure Induced Phase Separation in Lightly Doped La0.95Ca0.05Mn0.98Fe0.02O3 Manganite

SZS. V. ZaitsevOsipyan Institute of Solid State Physics RAS VSV. D. SedykhOsipyan Institute of Solid State Physics RAS АКА И КузьминOsipyan Institute of Solid State Physics RAS

Key Points

The aim is to investigate the effects of high pressure on the structural behavior of lightly doped manganite.
Conducted experiments on polycrystalline La0.95Ca0.05Mn0.98Fe0.02O3 manganite under varying pressure conditions.
Utilized Raman scattering and X-ray diffraction to analyze the structural changes and phase behavior.
Monitored the structural rearrangement at pressures above 4 GPa and 12 GPa.
Observed mesoscopic phase separation at high pressures in the manganite sample.
Noted Jahn–Teller distortion of MnO6 octahedra at lower pressures, transitioning to undistorted octahedra above 4 GPa.
Indicated significant structural heterogeneity in lightly doped samples based on Raman and X-ray data.

Abstract

In polycrystalline La0.95Ca0.05Mn0.98Fe0.02O3 manganite, high pressure leads to mesoscopic phase separation of the sample with the initial Jahn–Teller distortion of MnO6 octahedra and the emergence of regions with undistorted octahedra above 4 GPa, with a complete rearrangement of the structure above ~12 GPa. Raman scattering and X-ray diffraction data indicate significant heterogeneity of lightly doped samples.

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