Synthesis of carbon-rich hafnia thin films by pulsed laser deposition

Pejaković, Dušan A.; Marschall, Jochen; George, Mekha R.; Rogers, Bridget R.; Nieveen, Wesley; Pajcini, Vasil

doi:10.1016/j.jeurceramsoc.2010.01.009

Cited by 11 publications

(10 citation statements)

References 54 publications

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“…However, t ‐HfO 2 nanocrystallines were observed in the oxidation scale after cooling to room temperature in the present work. The stabilization mechanism of t ‐HfO 2 at room temperature might be similar to that of t ‐ZrO 2 25–30 . Both thermodynamic conditions (composition, temperature, and pressure) and kinetic conditions (activation energy of the phase change Δ G * ) have great effects on the phase stability.…”

Section: Discussionmentioning

confidence: 95%

“…It has been reported that undersized trivalent Al 3+ cations can be incorporated into ZrO 2 , which can partially stabilize t ‐ZrO 2 25 . Previous studies also have shown that free carbon might be a factor in stabilizing t ‐ZrO 2 26,27 . In the case of HfO 2 , the Al 3+ as well as remaining free carbon may play a similar role in the stabilization of the tetragonal phase.…”

Section: Discussionmentioning

confidence: 99%

“…25 Previous studies also have shown that free carbon might be a factor in stabilizing t-ZrO 2 . 26,27 In the case of HfO 2 , the Al 31 as well as remaining free carbon may play a similar role in the stabilization of the tetragonal phase. In addition, hydrostatic strain energy (aggregation, consolidation, or elastic constraint) can enhance the stability of t-HfO 2 .…”

Section: Discussionmentioning

confidence: 99%

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Oxidation Behavior of Ternary Carbide Ceramics in Hf–Al–C System in Air

Nian

et al. 2010

Journal of the American Ceramic Society

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The oxidation behavior of Hf–Al–C ceramics containing 37.5 wt% Hf3Al3C5, 30.5 wt% Hf2Al4C5, and 32.0 wt% Hf3Al4C6 has been investigated at 900°–1300°C in air. The oxidation kinetics approximately follows a linear law with the activation energy of 194±12 kJ/mol. The oxidation resistance of Hf–Al–C ceramics at high temperature is superior to HfC. The oxide scale is porous and composed of well‐mixed t‐HfO2 and Al2O3 as well as residual free carbon. The stabilization mechanisms of t‐HfO2 and free carbon have been discussed. The simultaneous oxidation of Hf and Al in Hf–Al–C ceramics can be attributed to their close oxygen affinity as well as the strong coupling between Hf–C blocks and Al–C units in the crystal structures.

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Section: Discussionmentioning

confidence: 95%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Oxidation Behavior of Ternary Carbide Ceramics in Hf–Al–C System in Air

Nian

et al. 2010

Journal of the American Ceramic Society

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“…This procedure helps in offering high resistance to pullout which results in higher strength material with delayed fracture [190]. Similarly, Pejaković et al (2010) reported the synthesis of carbon rich-hafnia thin films using PLD technique. The NMR results showed that the sample contained graphene aromatically bonded carbon atoms presumably in graphene phase [191].…”

Section: Ceramic Reinforced Graphene Nanocomposites and Theirmentioning

confidence: 98%

A Comprehensive Review of Graphene Nanocomposites: Research Status and Trends

Dhand

Rhee

Kim

et al. 2013

Journal of Nanomaterials

212

114

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This paper provides a comprehensive review of the present trends in graphene research with an emphasis on graphene-based nanocomposites and their applications. Various synthesis routes have recently been devised for mass production of graphene to address the needs of the composite industry. This paper describes the worldwide scenario of research and patents being conducted in the field of graphene nanocomposites. It concludes with a discussion of the impact of graphene in composites and the future challenges to meeting industrial demands.

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“…4). Combined NRA and RBS analysis was already utilized to determine the composition of several light element including some TiO and HfO based materials, but these works are restricted to the case of thin films [34,35] and were mostly performed using exclusively RBS [36,37]. Moreover, none or very little is discussed about uncertainties.…”

Section: Chemical Analysis By Iga and Ibamentioning

confidence: 99%

Novel insight into the chemical analysis of light elements in oxycarbides

et al. 2018

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Pure powders of TiCxO(1-x) solid solution were synthesized through the carbothermal route. The chemical analysis of the light elements in the as-obtained TiCxO(1-x) oxycarbides powders were performed by Instrumented Gas Analysis (IGA). The cell parameters of the samples were determined with an accuracy of about 2% by means of X-ray powder diffraction and the internal standard method. As a result, a model correlating the cell parameters to the chemical composition was established. These reference TiCxO(1-x) oxycarbides powders were then sintered in order to obtain pellets of dense ceramics. After having determined that the sintering process does not change the chemical composition of the starting powder, chemical analysis of the different samples of the solid solution were successfully undertaken by Ion Beam Analysis techniques (IBA). The Nuclear Reaction Analysis (NRA) method -that was used to analyse light elements with very high sensitivity -was coupled with Rutherford Back Scattering (RBS) analysis in order to accurately determine the metallic over light elements ratio and to determine the stoichiometry of the phase on massive samples. Exhaustive simulations of the NRA spectra were performed and demonstrated that discrete compositions of the TiCxO(1-x) can be efficiently measured locally for bulk samples. Compared to IGA results, the relative amounts of carbon and oxygen of bulk materials were determined with a bias lower than 5%. This protocol being implemented for the TiCxO(1-x) system was then tested on HfCxO(1-x)with the same success.3

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Synthesis of carbon-rich hafnia thin films by pulsed laser deposition

Cited by 11 publications

References 54 publications

Oxidation Behavior of Ternary Carbide Ceramics in Hf–Al–C System in Air

Oxidation Behavior of Ternary Carbide Ceramics in Hf–Al–C System in Air

A Comprehensive Review of Graphene Nanocomposites: Research Status and Trends

Novel insight into the chemical analysis of light elements in oxycarbides

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