The effects of carbon and nitrogen incorporation on the structure, mechanical properties and superconducting transition temperature of (NbMoTaW)100-z(CN)z coatings

IF 2 4区材料科学 Q3 MATERIALS SCIENCE, COATINGS & FILMS

Thin Solid Films Pub Date : 2025-05-21 DOI:10.1016/j.tsf.2025.140704

František Lofaj , Petra Hviščová , Gabriel Pristáš , Jozef Dobrovodský , Dmitry Albov , Maksym Lisnichuk , Slavomír Gabáni , Karol Flachbart

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Abstract

Studies of the effects of nitrogen and carbon concentration on reactive DC magnetron sputtered (NbMoTaW)_100-z(CN)_z coatings reveal that nitrogen and carbon are actively incorporated into the cubic sub-lattice of metals until saturation is achieved above 4 sccm of N₂ flow. The hardness and indentation modulus of the studied coatings strongly depend on the concentration of nitrogen and carbon. Maximum hardness values of around 50 GPa, considerably exceeding the superhardness limit of 40 GPa, are achieved when the sum of nitrogen and carbon concentration approaches 50 at %. The content of nitrogen and carbon also influences the superconducting transition temperature T_c. Nevertheless, it turns out that the carbon concentration has a decisive influence on the observed T_c changes. The reason is probably the lower atomic mass of carbon compared to nitrogen and the increase of the electron-phonon interaction due to the different bonding of carbon (compared to N) to the metallic sub-lattice.

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碳氮掺入对（NbMoTaW）100-z(CN)z涂层结构、力学性能和超导转变温度的影响

研究了氮和碳浓度对反应性直流磁控溅射（NbMoTaW）100-z(CN)z涂层的影响，发现氮和碳被积极地结合到金属的立方亚晶格中，直到在N2流大于4 sccm时达到饱和。所研究涂层的硬度和压痕模量与氮和碳的浓度有很大关系。当氮碳浓度之和接近50% at %时，合金的最大硬度值约为50 GPa，大大超过了40 GPa的超硬度极限。氮和碳的含量也影响超导转变温度Tc。然而，碳浓度对观测到的Tc变化有决定性的影响。其原因可能是碳的原子质量比氮低，并且由于碳（与N相比）与金属子晶格的不同键合而增加了电子-声子相互作用。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Thin Solid Films 工程技术-材料科学：膜

CiteScore

4.00

自引率

4.80%

发文量

381

审稿时长

7.5 months

期刊介绍： Thin Solid Films is an international journal which serves scientists and engineers working in the fields of thin-film synthesis, characterization, and applications. The field of thin films, which can be defined as the confluence of materials science, surface science, and applied physics, has become an identifiable unified discipline of scientific endeavor.