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Wachtel, Ellen
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Publications (7/7 displayed)
- 2024A Gd-doped ceria/TiOx nanocomposite as the active layer in a three terminal electrochemical resistivity switch.citations
- 2022C-Axis Textured, 2–3 μm Thick Al0.75Sc0.25N Films Grown on Chemically Formed TiN/Ti Seeding Layers for MEMS Applicationscitations
- 2019Oxygen vacancy ordering and viscoelastic mechanical properties of doped ceria ceramicscitations
- 2017Self-supported Gd-doped ceria films for electromechanical actuationcitations
- 2012Influence of Gd content on the room temperature mechanical properties of Gd-doped ceriacitations
- 2002Synthesis and properties of alkali metal intercalated fullerene-like MS2 (M=W,MO) nanoparticles
- 2002Alkali metal intercalated fullerene-like MS2 (M = W, Mo) nanoparticles and their propertiescitations
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article
Oxygen vacancy ordering and viscoelastic mechanical properties of doped ceria ceramics
Abstract
<p>Young's, shear and bulk moduli of Ce<sub>1-x</sub>Sm<sub>x</sub>O<sub>2-x/2</sub> (x ≤ 0.55) were studied using ultrasonic time of flight and nanoindentation techniques. Sound velocity measurements, corrected for sample porosity, demonstrate decrease in the unrelaxed ceramic moduli with increasing Sm-content. Room temperature creep under indenter load-hold, as well as time-dependent material stiffness, reveal a transition from prominent anelasticity in the fluorite phase to prominent elasticity in the double fluorite phase. This supports rearrangement of elastic dipoles under anisotropic stress, which occurs more readily when oxygen vacancies are not ordered on the crystal lattice, as the source of ceria anelastic behavior.</p>