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

Davis, Elijah M.; Rawn, Claudia; Boebinger, Matthew G.; Mukherjee, Dibyendu

doi:10.1038/s41598-025-90586-z

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

Journal Article · Thu Mar 06 00:00:00 UTC 2025 · Scientific Reports

DOI: https://doi.org/10.1038/s41598-025-90586-z · OSTI ID:2528122

Davis, Elijah M. ^[1]; Rawn, Claudia ^[2]; Boebinger, Matthew G. ^[3]; Mukherjee, Dibyendu ^[4]

Univ. of Tennessee, Knoxville, TN (United States); Univ. of Miami, Coral Gables, FL (United States)
Univ. of Tennessee, Knoxville, TN (United States)
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Univ. of Miami, Coral Gables, FL (United States)

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 excess trapped gases. Our results indicate the atomic density of the AlO₃ structures to be ~5–10 times less than that of the final Al₂O₃ phases, which led to the hypothesis of a volume shrinkage process during their phase transition. Temperature-dependent X-ray diffraction studies reveal the high-temperature phase transition for m-AlO₃ → θ/γ-Al₂O₃ to follow contracting volume kinetics model, thereby validating our earlier hypothesis. Using the geometric volume contraction model, reaction kinetics analyses from Arrhenius plots reveal the activation energy barrier for the phase transition to be ~270±11 kJ/mol. This makes the activation energy barrier nearly identical to the oxidation of micron-sized Al particles.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 2528122

Journal Information:: Scientific Reports, Journal Name: Scientific Reports Journal Issue: 1 Vol. 15; ISSN 2045-2322

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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

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