Surface structure of coherently strained ceria ultrathin films

Shi, Ying; Stone, Kevin H.; Guan, Zixuan; Monti, Matteo; Cao, Chuntian; Gabaly, Farid El; Chueh, William C.; Toney, Michael F.

doi:10.1103/physrevb.94.205420

Cited by 6 publications

(2 citation statements)

References 56 publications

(61 reference statements)

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“…Strain effects on thin films caused by the lattice expansion or contraction will alter the electronic structures of the surface atoms hence the surface chemistry [28,30c,93] . Oxygen vacancies are created and diffused under the strain effects [23b,60,94] .…”

Section: Water Interaction On Ceriamentioning

confidence: 99%

Interaction of Water with Ceria Thin Film

Zhou,

Akber,

Zhao

et al. 2023

ChemCatChem

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Water interaction with ceria is a fundamental process underpinning catalytic reactions such as water‐gas‐shift and water electrolysis. This review summarizes the investigations of water interactions with the ceria low‐index surfaces [(111), (100), and (110)]. The first part introduces: (a) The atomic structures of the stoichiometric CeO2 and reduced CeOx (x=1.5∼2) thin films, including the characteristics of oxygen vacancies; (b) The anisotropic migration mechanisms of oxygen vacancies and the locations of the entangled polarons in the reduced ceria. The second part reviews water‘s adsorption, desorption, dissociation, and redox properties on the ceria low‐index surfaces studied by DFT, TPD, XPS, RPES, TEM, and SPM methods. The impacts of water coverage, ceria film thickness, strain effect, dopant effect, face stability, and solid‐liquid interface on the interaction between water and ceria are also discussed. At last, this review sheds some light on the future directions and challenges in this topic.

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Section: Water Interaction On Ceriamentioning

confidence: 99%

Interaction of Water with Ceria Thin Film

Zhou,

Akber,

Zhao

et al. 2023

ChemCatChem

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show abstract

“…For example, co-existence of two-dimensional and threedimensional growth modes in a thin film results in a more complex roughness factor. 14 These approaches generally work well when the crystal surface is parallel to a lowindex plane. However, no real surface is parallel to a low-index plane.…”

Section: Introductionmentioning

confidence: 99%

Crystal truncation rods from miscut surfaces

et al. 2017

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Crystal truncation rods are used to study surface and interface structure. Since real surfaces are always somewhat miscut from a low index plane, it is important to study the effect of miscut on crystal truncation rods. We develop a model that describes the truncation rod scattering from miscut surfaces that have steps and terraces. We show that non-uniform terrace widths and jagged step edges are both forms of roughness that decrease the intensity of the rods. Non-uniform terrace widths also result in a broad peak that overlaps the rods. We use our model to characterize the terrace width distribution and step edge jaggedness on three SrTiO$_3$ (001) samples, showing excellent agreement between the model and the data, confirmed by atomic force micrographs of the surface morphology. We expect our description of terrace roughness will apply to many surfaces, even those without obvious terracing

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Anelastic and Electromechanical Properties of Doped and Reduced Ceria

2018

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Room-temperature mechanical properties of thin films and ceramics of doped and undoped ceria are reviewed with an emphasis on the anelastic behavior of the material. Notably, the unrelaxed Young's modulus of Gd-doped ceria ceramics measured by ultrasonic pulse-echo techniques is >200 GPa, while the relaxed biaxial modulus, calculated from the stress/strain ratio of thin films, is ≈10 times smaller. Oxygen-deficient ceria exhibits a number of anelastic effects, such as hysteresis of the lattice parameter, strain-dependent Poisson's ratio, room-temperature creep, and nonclassical electrostriction. Methods of measuring these properties are discussed, as well as the applicability of Raman spectroscopy for evaluating strain in thin films of Gd-doped ceria. Special attention is paid to detection of the time dependence of anelastic effects. Both the practical advantages and disadvantages of anelasticity on the design and stability of microscopic devices dependent on ceria thin films are discussed, and methods of mitigating the latter are suggested, with the aim of providing a cautionary note for materials scientists and engineers designing devices containing thin films or bulk ceria, as well as providing data-based constraints for theoreticians who are involved in modeling of the unusual electrical and electromechanical properties of undoped and doped ceria.

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Surface structure of coherently strained ceria ultrathin films

Cited by 6 publications

References 56 publications

Interaction of Water with Ceria Thin Film

Interaction of Water with Ceria Thin Film

Crystal truncation rods from miscut surfaces

Anelastic and Electromechanical Properties of Doped and Reduced Ceria

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