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Meeting 2026 TMS Annual Meeting & Exhibition
Symposium Advances in Ceramic Materials and Processing
Presentation Title Swift Heavy Ion Track Formation in Sr-Based High-Entropy Perovskites
Author(s) Ritesh Sachan, Ashish Gupta, Eva Zarkadoula, Brianna L. Musico, Christina Trautmann, Jie Liu, Veerle Keppens, Yanwen Zhang, William J. Weber
On-Site Speaker (Planned) Ritesh Sachan
Abstract Scope High entropy oxides (HEOs) have attracted significant scientific interest due to their compositional complexities unlocking novel or enhanced properties. The incorporation of multiple elements into a cation lattice site in HEOs influences atomic-level responses to energetic ion irradiation. This study investigates nanoscale phase transitions in perovskite-structured Sr(Zr₀.₂Sn₀.₂Ti₀.₂Hf₀.₂Nb₀.₂)O₃ (Sr-HEO) under swift heavy ion irradiation (774 MeV Xe). Unlike typical amorphous ion-tracks, Sr-HEO exhibits discontinuous and partially recrystallized tracks. The presence of multiple cations at the B-site reduces ion track diameters compared to SrTiO₃ under the same energy-loss conditions. While SrTiO₃ tracks display a core-shell structure with a disordered interface, Sr-HEO tracks exhibit minimal lattice distortion, restricted within ~2–3 monolayers. Atomic-resolution observations reveal that the amorphous phase in Sr-HEO remains stable under electron irradiation, unlike SrTiO₃, which readily recrystallizes. This stability is attributed to structural complexities resisting recrystallization, outweighing electron-induced excitations and local heating effects that facilitate defect migration in SrTiO₃.
Proceedings Inclusion? Planned:
Keywords Ceramics, Energy Conversion and Storage, Phase Transformations

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