Hybridized microstructures of oxygen-defective HfO2−x films produced by controlling oxidation of metallic Hf foil

IF 3.8 3区材料科学 Q1 MATERIALS SCIENCE, CERAMICS Journal of the American Ceramic Society Pub Date : 2025-01-05 DOI:10.1111/jace.20362

Mitsuhiro Matsuda, Kai Imamura, Kaori Kusuda, Masahiro Shozaki, Kenji Shida, Motohide Matsuda

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Abstract

We successfully produced a dopant-free oxygen-defective HfO₂₋_x film that exhibit room-temperature ferromagnetism via a heat treatment of metallic Hf foil at 1673 K for 10 h under an oxygen partial pressure of 1.0 × 10⁻⁴ atm. The sample, which exhibits ∼50% transmission of visible light, demonstrates room-temperature ferromagnetism, with saturation and residual magnetizations of ∼0.05 emu/g and ∼0.005 emu/g, respectively. The HfO₂₋_x film comprises columnar grains several hundred nanometers wide and several micrometers long. High-angle annular dark-field scanning electron microscopy observations indicated that the tetragonal HfO₂ structure was distributed in nanodomains within the monoclinic HfO₂ grains; that is, the films exhibited a hybridized microstructure. The tetragonal HfO₂ structure would be mainly due to the introduction of oxygen deficiencies, which led to the room-temperature ferromagnetism.

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控制金属Hf箔氧化制备氧缺陷HfO2−x膜的杂化微结构

通过对金属Hf箔在1673 K下，在1.0 × 10−4 atm的氧分压下热处理10 h，成功制备出具有室温铁磁性的无掺杂氧缺陷HfO2−x薄膜。该样品的可见光透射率为~ 50%，具有室温铁磁性，饱和和剩余磁化强度分别为~ 0.05 emu/g和~ 0.005 emu/g。HfO2−x薄膜由几百纳米宽、几微米长的柱状颗粒组成。高角度环形暗场扫描电镜观察表明，在单斜晶内，HfO2的四边形结构分布在纳米畴内；也就是说，薄膜呈现出杂化的微观结构。四方HfO2结构的形成主要是由于氧的缺乏导致了室温铁磁性的形成。

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来源期刊

Journal of the American Ceramic Society 工程技术-材料科学：硅酸盐

CiteScore

7.50

自引率

7.70%

发文量

590

审稿时长

2.1 months

期刊介绍： The Journal of the American Ceramic Society contains records of original research that provide insight into or describe the science of ceramic and glass materials and composites based on ceramics and glasses. These papers include reports on discovery, characterization, and analysis of new inorganic, non-metallic materials; synthesis methods; phase relationships; processing approaches; microstructure-property relationships; and functionalities. Of great interest are works that support understanding founded on fundamental principles using experimental, theoretical, or computational methods or combinations of those approaches. All the published papers must be of enduring value and relevant to the science of ceramics and glasses or composites based on those materials. Papers on fundamental ceramic and glass science are welcome including those in the following areas: Enabling materials for grand challenges[...] Materials design, selection, synthesis and processing methods[...] Characterization of compositions, structures, defects, and properties along with new methods [...] Mechanisms, Theory, Modeling, and Simulation[...] JACerS accepts submissions of full-length Articles reporting original research, in-depth Feature Articles, Reviews of the state-of-the-art with compelling analysis, and Rapid Communications which are short papers with sufficient novelty or impact to justify swift publication.