In situ high-temperature transmission electron microscopy of tantalum/carbon composite films under near-infrared laser irradiation

IF 4.3 3区材料科学 Q2 MATERIALS SCIENCE, COATINGS & FILMS

Diamond and Related Materials Pub Date : 2024-07-14 DOI:10.1016/j.diamond.2024.111414

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Abstract

Amorphous tantalum (Ta)/carbon (C) composite films were heated with the irradiation of near-infrared lasers. The phase transformation and microstructural evolution of the films during the heating process were in situ observed by transmission electron microscopy. TaC crystals with a NaCl structure of 5–40 nm in diameter were formed in the films under laser irradiation with a density of 10 MW/m². The crystals coalesced after 160 MW/m² irradiation and the crystals diameter increased to 20–80 nm. A Ta₂C phase with a hexagonal structure was observed in addition to the TaC phase in the films after laser irradiation. This double-phase texture transformed to the single Ta₂C phase, and the diameter increased to 80–160 nm after re-irradiation up to 190 MW/m². The highest temperature at this maximum irradiation density was estimated to be 2076–2230 ± 797 K. The texture maintained after decreasing of irradiation to zero and cooling to ambient temperature, revealing that the single Ta₂C phase was stable after heating at this temperature.

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近红外激光照射下钽/碳复合薄膜的原位高温透射电子显微镜观察

在近红外激光的照射下加热非晶态钽（Ta）/碳（C）复合薄膜。透射电子显微镜对加热过程中薄膜的相变和微观结构演变进行了现场观察。在密度为 10 MW/m2 的激光照射下，薄膜中形成了直径为 5-40 nm 的具有 NaCl 结构的 TaC 晶体。在 160 MW/m2 的辐照下，晶体凝聚，直径增至 20-80 nm。在激光辐照后的薄膜中，除了 TaC 相之外，还观察到具有六边形结构的 Ta2C 相。这种双相结构转变为单一的 Ta2C 相，再次辐照至 190 MW/m2 时，直径增至 80-160 nm。在此最大辐照密度下的最高温度估计为 2076-2230 ± 797 K。辐照度降低到零并冷却到环境温度后，纹理保持不变，这表明在此温度下加热后，单个 Ta2C 相是稳定的。

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来源期刊

Diamond and Related Materials 工程技术-材料科学：综合

CiteScore

6.00

自引率

14.60%

发文量

702

审稿时长

2.1 months

期刊介绍： DRM is a leading international journal that publishes new fundamental and applied research on all forms of diamond, the integration of diamond with other advanced materials and development of technologies exploiting diamond. The synthesis, characterization and processing of single crystal diamond, polycrystalline films, nanodiamond powders and heterostructures with other advanced materials are encouraged topics for technical and review articles. In addition to diamond, the journal publishes manuscripts on the synthesis, characterization and application of other related materials including diamond-like carbons, carbon nanotubes, graphene, and boron and carbon nitrides. Articles are sought on the chemical functionalization of diamond and related materials as well as their use in electrochemistry, energy storage and conversion, chemical and biological sensing, imaging, thermal management, photonic and quantum applications, electron emission and electronic devices. The International Conference on Diamond and Carbon Materials has evolved into the largest and most well attended forum in the field of diamond, providing a forum to showcase the latest results in the science and technology of diamond and other carbon materials such as carbon nanotubes, graphene, and diamond-like carbon. Run annually in association with Diamond and Related Materials the conference provides junior and established researchers the opportunity to exchange the latest results ranging from fundamental physical and chemical concepts to applied research focusing on the next generation carbon-based devices.