Charge Separation in BaTiO3 Nanocrystals: Spontaneous Polarization Versus Point Defect Chemistry

Article Physics, Condensed Matter

Defect engineering of oxide surfaces: dream or reality?

Gianfranco Pacchioni et al.

Summary: This brief perspective discusses the status of defect engineering of oxide surfaces, focusing on the tools and techniques for studying point defects at oxide surfaces and their importance in practical applications.

JOURNAL OF PHYSICS-CONDENSED MATTER (2022)

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Article Materials Science, Ceramics

Fundamentals and practical dielectric implications of stoichiometry and chemical design in a high-performance ferroelectric oxide: BaTiO3

C. A. Randall et al.

Summary: This paper discusses the importance of defect chemistry in BaTiO3 for the materials engineering of capacitive devices and its impact on intrinsic properties. The fundamentals are studied using phase equilibria, defect chemistry, and doping strategies. First principles calculations reveal information about the complexes and conduction mechanisms. Experimental studies show the influence of defect dynamics on oxygen vacancies. Additionally, the paper reviews the detrimental effects on time-dependent properties.

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY (2022)

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Review Chemistry, Multidisciplinary

Catalytic Applications of Non-Centrosymmetric Oxide Nanomaterials

Ifeanyichukwu C. Amaechi et al.

Summary: This article discusses the application of noble-metal-free catalytic nanoparticles in photocatalysis and tribocatalysis, focusing on the use of non-centrosymmetric and polar oxide nanoparticles, as well as the role of different charges in catalytic reactions.

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION (2022)

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Article Multidisciplinary Sciences

Bipolar charge collecting structure enables overall water splitting on ferroelectric photocatalysts

Yong Liu et al.

Summary: This paper proposes a method to fabricate interfacial charge-collecting nanostructures on the positive and negative domains of a ferroelectric material, facilitating water splitting in ferroelectric photocatalysts. The study observes efficient accumulation of photogenerated electrons and holes around Au nanoparticles, located in the positive and negative domains of a BaTiO3 single crystal. Photocatalytic overall water splitting is achieved on a ferroelectric BaTiO3 single crystal after assembling oxidation and reduction cocatalysts on charged Au nanoparticles.

NATURE COMMUNICATIONS (2022)

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Review Chemistry, Applied

Approaches for enhancing the photocatalytic activities of barium titanate: A review

Gopal Panthi et al.

Summary: Barium titanate (BaTiO3) is a widely used photocatalyst in environmental applications due to its low-cost, chemical stability, and non-toxicity. However, the large band gap and recombination of photogenerated charge carriers limit its photocatalytic efficiency. Various strategies, such as controlling particle size and morphology, doping and loading with noble metals, and forming heterojunctions, have been proposed to modify the electronic band structure of BaTiO3 and enhance its photocatalytic activity.

JOURNAL OF ENERGY CHEMISTRY (2022)

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Review Chemistry, Physical

Characterisation and reactivity of oxygen species at the surface of metal oxides

M. Anpo et al.

Summary: This review provides an overview of surface oxygen species on oxide materials, including their nature, characterization, formation pathways, and involvement in catalytic and photocatalytic reactions. Special focus is given to the application of advanced techniques such as EPR and PL for detailed characterization of different oxygen species on oxide surfaces.

JOURNAL OF CATALYSIS (2021)

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Article Chemistry, Multidisciplinary

Structural Details of BaTiO3 Nano-Powders Deduced from the Anisotropic XRD Peak Broadening

Iuliana Pasuk et al.

Summary: In this study, nano-BaTiO3 powders were synthesized using the solvothermal method at different reaction times and characterized by TEM, XRD, and Raman spectroscopy. The results showed that the structure parameters of nano-BTO did not exhibit phase transition up to 170 degrees C, and the line widths correlated with tetragonal deformations. The experimental results are consistent with the core-shell model for both nano-BTO and mezoscale-BTO.

NANOMATERIALS (2021)

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Article Chemistry, Physical

Paramagnetic electron centers in BaTiO3 nanoparticle powders

Ellie Neige et al.

Summary: This study investigated the point defects in BaTiO3 nanoparticles produced by flame spray pyrolysis, revealing the structural changes during annealing process at different temperatures, as well as the electron trapping phenomenon in polycrystalline particles at 1173K. These insights are crucial for understanding the performance of BaTiO3 nanoparticles as photocatalysts or dielectric components.

PHYSICAL CHEMISTRY CHEMICAL PHYSICS (2021)

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Article Materials Science, Ceramics