Optical coatings of durability based on transition metal nitrides

Hu, Chaoquan; Guo, Kaiyu; Li, Yuankai; Gu, Zhiqing; Quan, Jingkai; Zhang, Sam; Zheng, Weitao

doi:10.1016/j.tsf.2019.05.058

Cited by 37 publications

(14 citation statements)

References 170 publications

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“…The changes on the metal/nitrogen ratio determine phase composition, crystal structure, film morphology, thermal stability, and many other structural and chemical properties affecting the final performance (optical, electrical, mechanical, oxidation resistance, etc.) [10][11][12][13]. In certain applications, a graded chemical composition (gradient or multilayer architecture) is searched deliberately in order to achieve a good adhesion on the substrate, and a progressive adaptation to the desired functionality.…”

Section: Introductionmentioning

confidence: 99%

Tailoring CrNx stoichiometry and functionality by means of reactive HiPIMS

Sánchez-López

Caro

Alcalá

et al. 2020

Surface and Coatings Technology

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Section: Introductionmentioning

confidence: 99%

Tailoring CrNx stoichiometry and functionality by means of reactive HiPIMS

Sánchez-López

Caro

Alcalá

et al. 2020

Surface and Coatings Technology

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“…Hafnium nitride (HfN) is a refractory material that has favorable properties such as high reported melting point (3300–3387 °C), , high hardness, high elastic moduli, low electrical resistivity (∼50 μΩ cm), good optical coating properties, , high solar and infrared reflectivity, and high chemical stability against corrosion. , HfN is also a superconductor with transition temperatures ( T c ) of 8.83 and 6.2 K. − It has been used as a coating layer in cemented carbide cutting tools to improve their performance and life due to its high hot hardness . The favorable properties together with the bright metallic/gold color of HfN also lend it for use as coatings in turbine blades and window glasses not only as a decorating medium but also to improve product properties .…”

Section: Introductionmentioning

confidence: 99%

Crystallographic Study of Product Phases of Carbothermic Reduction and Nitridation of Hafnium Dioxide

Silva,

Kondrat,

Holliday

et al. 2023

Inorg. Chem.

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Details of the carbothermic reduction/nitridation to synthesize hafnium nitride (HfN) and hafnium carbide (HfC) are scarce in the literature. Therefore, this current study was carried out to evaluate two pathways for synthesizing these two refractory materials: direct nitridation and carbothermic reduction/nitridation. Two mixtures of hafnium dioxide and carbon with C/ HfO 2 molar ratios of 2.15 and 3.1 were nitridized directly using flowing nitrogen gas at elevated temperatures (1300−1700 °C). The 3.1 C/HfO 2 molar ratio mixture was also carbothermically reduced under flowing argon gas to synthesize HfC, which was converted into HfN by introducing a nitridation step under both N 2(g) and N 2(g) -10% H 2(g) . X-ray diffraction results showed the formation of HfN at 1300 and 1400 °C and HfC 1−y N y at ≥1400 °C under direct nitridation of samples using a C/HfO 2 molar ratio of 2.15. These phase analysis data together with lower lattice strain and greater crystallite sizes of HfC 1−y N y that formed at higher temperatures suggested that the HfC 1−y N y phase is preferred over HfN at those temperatures. Carbothermic reduction of 3.1 C/HfO 2 molar ratio samples under an inert atmosphere produced single-phased HfC with no significant levels of dissolved oxygen. Carbothermic reduction nitridation made two phases of different carbon levels (HfC 1−y N y and HfC 1−y′ N y′ , where y′ < y), while direct nitridation produced a single HfC 1−y N y phase under both N 2 and N 2 -10% H 2 cover gas environments.

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“…In addition, the high corrosion resistance of TiN makes it a suitable plasmonic material in extremely harsh conditions. Therefore, TiN has been a material of choice for many practical applications such as durable optical coatings, solar absorbers, solar cell contacts, and refractive index sensors . Recently, it was reported that MBE-deposited TiN exhibits a very high reflectance of more than 90% at near-infrared spectral ranges, similar to gold .…”

Section: Introductionmentioning

confidence: 99%

Refractory Plasmonic Hafnium Nitride and Zirconium Nitride Thin Films as Alternatives to Silver for Solar Mirror Applications

Das

Biswas

Maurya

et al. 2022

ACS Appl. Mater. Interfaces

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Harnessing solar energy by employing concentrated solar power (CSP) systems requires materials with high electrical conductivity and optical reflectivity. Silver, with its excellent optical reflectance, is traditionally used as a reflective layer in solar mirrors for CSP technologies. However, silver is soft and expensive, quickly tarnishes, and requires a protective layer of glass for practical applications. Moreover, supply-side constraints and high-temperature instability of silver have led to the search for alternative materials that exhibit high solar and infrared reflectance. Transition metal nitrides, such as titanium nitride, have emerged as alternative plasmonic materials to gold starting from a spectral range of ∼500 nm. However, to achieve high solar reflection (∼320–2500 nm), materials with epsilon-near-zero starting from the near-ultraviolet (UV) spectral region are required. Here, we show the development of refractory epitaxial hafnium nitride (HfN) and zirconium nitride (ZrN) thin films as excellent mirrors with a solar reflectivity of ∼90.3% and an infrared reflectivity of ∼95%. Low-loss and high-quality epsilon-near-zero resonance at near-UV (∼340–380 nm) spectral regions are achieved in HfN and ZrN by carefully controlling the stoichiometry, leading to a sharp increase in the reflection edge that is on par with silver. Temperature-dependent reflectivity and dielectric constants are further measured to demonstrate their high-temperature suitability. The development of refractory epitaxial HfN and ZrN thin films with high solar and infrared reflectance makes them excellent alternative plasmonic materials to silver and would pave their applications in CSP, daytime radiative cooling, and others.

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Optical coatings of durability based on transition metal nitrides

Cited by 37 publications

References 170 publications

Tailoring CrNx stoichiometry and functionality by means of reactive HiPIMS

Tailoring CrNx stoichiometry and functionality by means of reactive HiPIMS

Crystallographic Study of Product Phases of Carbothermic Reduction and Nitridation of Hafnium Dioxide

Refractory Plasmonic Hafnium Nitride and Zirconium Nitride Thin Films as Alternatives to Silver for Solar Mirror Applications

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