Communication Dans Un Congrès Année : 2025

Atomic-Scale Structural Analysis of Metastable Zirconia

Résumé

Solid-state Phases that exist beyond their thermodynamic fields of stability are important to emerging technologies. Metastable phases are prevalent in far-from-equilibrium processing approaches and often exhibit desirable chemical and physical properties. However, there is limited understanding of the atomic-scale structural mechanisms that allow metastable phases to be recovered to ambient conditions. Metastability plays an important role in the synthesis of different zirconia (ZrO2) polymorphs. We utilized a complementary approach of neutron total scattering and Extended X-ray Absorption Fine-Structure (EXAFS) analysis to investigate the atomic-scale recovery process and structural properties of the metastable tetragonal phase. Grain-size reduction to the nanometer range and bombardment with high-energy (GeV) ions were used to prepare this metastable form of zirconia. We show in this presentation that the formation of a hierarchical network of nanoscale domains of lower symmetry, separated by domain walls, is the underlying structural mechanism that provides the pathway to the metastable state.

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Dates et versions

hal-04975763 , version 1 (04-03-2025)

Identifiants

  • HAL Id : hal-04975763 , version 1

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Maik Lang, Alexandre P. Solomon, Eric C. O'Quinn, Gianguido Baldinozzi, Jueijing Liu, et al.. Atomic-Scale Structural Analysis of Metastable Zirconia. TMS 2025 Annual Meeting, Mar 2025, Las Vegas, NV, United States. ⟨hal-04975763⟩
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