Optical and mechanical properties of nanocrystalline ZrC thin films grown by pulsed laser deposition

Crǎciun, D.; Socol, G.; Lambers, E. S.; McCumiskey, Edward J.; Taylor, Curtis R.; Martin, C.; Argibay, Nicolas; Tanner, D. B.; Crăciun, V.

doi:10.1016/j.apsusc.2015.01.076

Cited by 18 publications

(6 citation statements)

References 18 publications

(35 reference statements)

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“…To better understand the effect, we performed a Lorentz-Drude analysis of the data. In the non-irradiated ZrC, similar to our previous work [14], we found a low frequency band centered around 250 cm −1 . Although its position is below our lowest measured frequency in this study, the existence of this band is well confirmed by our previous data.…”

Section: Resultssupporting

confidence: 91%

“…We also showed that PLD grown films, being very flat and smooth, with surface rms values of the order of 1 nm, could be investigated with nanometer depth resolution by grazing incidence X-ray diffraction (GIXRD), X-ray reflectivity (XRR) and nanoindentation to observe the effect of irradiation on density, surface morphology, structure and mechanical properties. In this article we investigated the effect of Ar ions irradiation on the optical properties of the irradiated ZrC and ZrN films and compare the results to the previous reported ones [14].…”

Section: Introductionmentioning

confidence: 85%

“…We mention that both ZrC and ZrN films are the same ones used in our previous optical studies on non-irradiated samples [14]. Because of some small differences between the instruments and the set-ups used in our previous work and in the current one, we measured one non-irradiated sample from the same batch as ZrC1 in the table above and another one from the same batch as ZrN1, and used their optical reflectance for comparison.…”

Section: Methodsmentioning

confidence: 99%

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Optical properties of Ar ions irradiated nanocrystalline ZrC and ZrN thin films

Martin

Miller

Makino

et al. 2017

Journal of Nuclear Materials

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Thin nanocrystalline ZrC and ZrN films (<400 nm), grown on (100) Si substrates at a substrate temperature of 500 °C by the pulsed laser deposition (PLD) technique, were irradiated by 800 keV Ar ion irradiation with fluences from 1 × 10 14 at/cm 2 up to 2 × 10 15 at/cm 2 . Optical reflectance data, acquired from as-deposited and irradiated films, in the range of 500 -50000 cm −1 (0.06 -6 eV), was used to assess the effect of irradiation on the optical and electronic properties. Both in ZrC and ZrN films we observed that irradiation affects the optical properties of the films mostly at low frequencies, which is dominated by the free carriers response. In both materials, we found a significant reduction in the free carriers scattering rate, i.e. possible increase in mobility, at higher irradiation flux. This is consistent with our previous findings that irradiation affects the crystallite size and the micro-strain, but it does not induce major structural changes.

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Section: Resultssupporting

confidence: 91%

Section: Introductionmentioning

confidence: 85%

Section: Methodsmentioning

confidence: 99%

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Optical properties of Ar ions irradiated nanocrystalline ZrC and ZrN thin films

Martin

Miller

Makino

et al. 2017

Journal of Nuclear Materials

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“…Several processing routes are available for producing ZrC: self-propagating synthesis (SHS) [14][15][16][17], mechanochemical synthesis [18][19][20], solution-based fabrication [21][22][23][24], and vapour routes such as chemical vapour deposition [25][26][27] and physical vapour deposition (PVD) [28][29][30]. For bulk production, the carbothermic reduction of zirconia is commonly used due to its low cost and reproducibility, similar to the Acheson [31] process for fabricating silicon carbide (SiC).…”

Section: Introductionmentioning

confidence: 99%

Reactive carbothermal reduction of ZrC and ZrOC using Spark Plasma Sintering

Giorgi

Grasso

Zapata-Solvas

et al. 2018

Advances in Applied Ceramics

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Zirconium carbide and oxycarbide bulks were produced via Reactive Spark Plasma Sintering (RSPS) using zirconia and carbon powders. The effects of dwell temperature, uniaxial pressure and heating rate on final chemical composition/stoichiometry were investigated. Heating rates (20-200°C min-1) had no significant effect on RSPS. The carbothermal reduction was hindered by increasing the sintering pressure. This was because of gases entrapped within the closed porosity. Under pressure-less conditions, the reaction onset started at ∼1300°C and the reduction was completed within 10 min resulting in an oxygen content as low as 1.47 at.-%. Under 16 MPa applied pressure, the reaction onset was shifted to 1830°C. Sub-micrometric zirconia powder (<0.1 µm) impacted negatively on the carbothermal reaction because of enhanced ZrO 2 sintering preceding the carbothermic reaction. The RSPS reaction mechanism began with zirconia particle densifications between 900 and 1400°C followed by nucleation and growth of an intermediate O-rich ZrOC phase, between 1800 and 2100°C almost all zirconia was consumed. The ZrOC phase then reacted out its oxygen while simultaneously sintering. The results suggest that an optimised RSPS involve a two-step process employing a pressure-less SPS synthesis followed by a pressure-assisted sintering.

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“…Moreover, they have a NaCl-type structure that is associated with ionic bonding. [1][2][3][4][5] By exploiting their favorable physical and chemical properties, on the one hand, the transition metal carbide refractory ceramics can be candidate materials for use in hightemperature nuclear applications. In particular, ZrC is being considered as a coating material for the tri-isotropic coated nuclear fuel used in high temperature reactors, replacing or in addition to the currently used SiC.…”

Section: Introductionmentioning

confidence: 99%

First principles study of ceramic materials (IVB group carbides) under ultrafast laser irradiation

Cheng

Zhang

et al. 2018

Chinese Phys. B

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Group IVB carbides have been applied in extreme aerospace environments as hard ceramic coatings; ZrC is being considered as a replacement for SiC in nuclear reactors. Therefore, a thorough understanding of the laser irradiation response of group IVB carbides is of clear significance. However, the existing knowledge on the fundamental properties of IVB group carbides is limited and insufficient with regard to both irradiated and non-irradiated characteristics. We investigate the effect of ultrafast laser irradiation on the lattice stability of ceramic materials (IVB group carbides) using the density functional perturbation theory (DFPT). The calculated phonon frequencies of TiC and ZrC at the ground state are in good agreement with previous calculations and experimental values. The phonon frequencies of IVB group carbides are positive, even though the electronic temperature reached 5 eV. Thus, IVB group carbides are more stable under ultrafast laser irradiation, which has greater benefits in nuclear and aeronautical applications compared to metals (W, Na), semimetals (Bi), and semiconductors (Si, SiC). The thermodynamic properties of ZrC are calculated as functions of their lattice temperature at different electronic temperatures. The elastic shear constants of IVB group carbides satisfy the Born stability criteria at T e = 5 eV. In addition, a comparison of the predicted melting temperatures of IVB group carbides, reveal that HfC is better suited for extreme high-temperature environments.

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Optical and mechanical properties of nanocrystalline ZrC thin films grown by pulsed laser deposition

Abstract: 2016-11-02T18:49:00

Cited by 18 publications

References 18 publications

Optical properties of Ar ions irradiated nanocrystalline ZrC and ZrN thin films

Optical properties of Ar ions irradiated nanocrystalline ZrC and ZrN thin films

Reactive carbothermal reduction of ZrC and ZrOC using Spark Plasma Sintering

First principles study of ceramic materials (IVB group carbides) under ultrafast laser irradiation

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