Kinetic analyses for solid-state phase transition of metastable amorphous-AlO_x (2.5 < x ≤ 3.0) nanostructures into crystalline alumina polymorphs.

ABSTRACT: Solid-solid phase change materials (SS-PCMs) hold promise for energy storage/dissipation in batteries and energetic materials. Yet, phase change kinetics for SS-PCMs undergoing metastable to semi-stable/stable phase transformations remain relatively ill-studied because trapping metastable phases remain challenging. Recently, we demonstrated the kinetic entrapment and stabilization of a highly disordered and amorphous Al-oxide phase m-AlO_x@C (x~2.5-3.0) via laser ablation synthesis in solution (LASiS). We report here, to our knowledge, the first chemical kinetics analysis for S-S phase transition of the m-AlO₃@C nanocomposites (< 5-8 nm sizes) into semi-stable equilibrium alumina phases (θ/γ-Al₂O₃) via disproportionation reaction, while releasing

SUBMITTER: Davis EM 

PROVIDER: S-EPMC11885656 | biostudies-literature | 2025 Mar

REPOSITORIES: biostudies-literature