Novel nanoceramics from in situ made nanocrystalline powders of pure nitrides and their composites in the system aluminum nitride AlN/gallium nitride GaN/aluminum gallium nitride Al0.5Ga0.5N

Drygaś, Mariusz; Kapusta, Katarzyna; Janik, Jerzy F.; Bućko, Mirosław M.; Gierlotka, S.; Stelmakh, S.; Pałosz, B.; Olejniczak, Zbigniew

doi:10.1016/j.jeurceramsoc.2020.06.015

Cited by 6 publications

(27 citation statements)

References 31 publications

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“…In the reference system of dimeric Al-tris(dimethylamide) plus dimeric Ga-tris(dimethylamide) refluxed in hexane, as outlined above, the presence of some mixed dimeric Al/Ga-tris(dimethylamide) was confirmed and shown to be linked to Al x Ga 1−x N solid solution formation upon further ammonolysis and nitridation [ 18 , 49 ]. In this regard, in the monometallic case of M = Al or Ga, a simplified sequence of reactions of interest includes the (i) ambient temperature transamination of dimeric M-amide + ammonia → polymeric M-amide-imide + dimethylamine and (ii) pyrolytical deamination/nitridation of M-amide-imide → M-nitride + ammonia.…”

Section: Resultsmentioning

confidence: 99%

“…The nitride powders were sintered following similar processing as previously reported by us for nanopowders in the system AlN-GaN [ 49 ]. This is quite a relevant case since in that report, the similar precursor routes and powder nitridation schemes were also carried out.…”

Section: Resultsmentioning

confidence: 99%

“…Upon ampoule opening, the powders were removed and briefly handled in air prior to the high pressure and high temperature sintering using the methodology worked out earlier by some of us [ 49 , 53 , 54 ]. Specifically, the powders were sintered for 3 min in a high pressure torroid cell at 650 and 1200 °C under the pressure of 7.7 GPa, to yield dark brown or dark grey ceramic pellets, D = 4 mm, of thickness ca.…”

Section: Methodsmentioning

confidence: 99%

“…We recently reported a related study on the preparation of mixed metal nitride nanopowders via transamination-deamination chemistry applied to selected metal organoamide derivatives in the system AlN-GaN, which was followed by no-additive high pressure and high temperature sintering of the nanopowders [ 49 ]. In that case, in addition to the binary nitride composites AlN-GaN, the nitrides stable solid solution Al x Ga 1-x N, 0 < x < 1, was already partially formed (or, to phrase it alternatively—the nitrides alloyed) in the nanopowder preparation stage and, under suitable conditions, continued to form during the subsequent high pressure and high temperature sintering (7.7 GPa, 1000 °C).…”

Section: Introductionmentioning

confidence: 99%

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Composite Nitride Nanoceramics in the System Titanium Nitride (TiN)-Aluminum Nitride (AlN) through High Pressure and High Temperature Sintering of Synthesis-Mixed Nanocrystalline Powders

et al. 2021

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Presented is a study on the original preparation of individual and in situ intimately mixed composite nanocrystalline powders in the titanium nitride-aluminum nitride system, Ti:Al = 1:1 (at.), which were used in high pressure (7.7 GPa) and high temperature (650 and 1200 °C) sintering with no binding additives for diverse individual and composite nanoceramics. First, variations in precursor processing pathways and final nitridation temperatures, 800 and 1100 °C, afforded a pool of mixed in the nanosized regime cubic TiN (c-TiN) and hexagonal AlN (h-AlN) composite nanopowders both with varying average crystallite sizes. Second, the sintering temperatures were selected either to preserve initial powder nanocrystallinity (650 °C was lower than both nitridation temperatures) or promote crystal growth and recrystallization (1200 °C was higher than both nitridation temperatures). Potential equilibration towards bimetallic compounds upon solution mixing of the organometallic precursors to nanopowders, monomeric Ti[N(CH3)2]4 and dimeric {Al[N(CH3)2]3}2, was studied with 1H and 13C NMR in C6D6 solution. The powders and nanoceramics, both of the composites and individual nitrides, were characterized if applicable by powder XRD, FT-IR, SEM/EDX, Vicker’s hardness, and helium density. The Vicker’s hardness tests confirmed many of the composite and individual nanoceramics having high hardnesses comparable with those of the reference h-AlN and c-TiN ceramics. This is despite extended phase segregation and, frequently, closed microsized pore formation linked mainly to the AlN component. No evidence was found for metastable alloying of the two crystallographically different nitrides under the applied synthesis and sintering conditions. The high pressure and high temperature sintering of the individual and in situ synthesis-mixed composite nanopowders of TiN-AlN was demonstrated to yield robust nanoceramics.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Composite Nitride Nanoceramics in the System Titanium Nitride (TiN)-Aluminum Nitride (AlN) through High Pressure and High Temperature Sintering of Synthesis-Mixed Nanocrystalline Powders

et al. 2021

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“…Upon ampoule opening, the powders were removed and briefly handled in air prior to high-pressure and high-temperature sintering, as described earlier [ 27 , 28 , 31 , 32 ]. Specifically, the powders were sintered for 3 min in a high-pressure torroid cell at 650, 1000, and 1200 °C under pressure of 7.7 GPa, yielding dark brown/golden or gray ceramic pellets, D = 4 mm, thickness ca.…”

Section: Methodsmentioning

confidence: 99%

New Nitride Nanoceramics from Synthesis-Mixed Nanopowders in the Composite System Gallium Nitride GaN–Titanium Nitride TiN

et al. 2021

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Presented is a study on the preparation, via original precursor solution chemistry, of intimately mixed composite nanocrystalline powders in the system gallium nitride GaN–titanium nitride TiN, atomic ratio Ga/Ti = 1/1, which were subjected to high-pressure (7.7 GPa) and high-temperature (650, 1000, and 1200 °C) sintering with no additives. Potential equilibration toward bimetallic compounds upon mixing of the solutions of the metal dimethylamide precursors, dimeric {Ga[N(CH3)2]3}2 and monomeric Ti[N(CH3)2]4, was studied with 1H- and 13C{H}-NMR spectroscopy in C6D6 solution. The different nitridation temperatures of 800 and 950 °C afforded a pool of in situ synthesis-mixed composite nanopowders of hexagonal h-GaN and cubic c-TiN with varying average crystallite sizes. The applied sintering temperatures were either to prevent temperature-induced recrystallization (650 °C) or promote crystal growth (1000 and 1200 °C) of the initial powders with the high sintering pressure of 7.7 GPa having a detrimental effect on crystal growth. The powders and nanoceramics, both of the composites and of the individual nitrides, were characterized if applicable by powder XRD, SEM/EDX, Raman spectroscopy, Vicker’s hardness, and helium density. No evidence was found for metastable alloying of the two crystallographically different nitrides under the applied synthesis and sintering conditions, while the nitride domain segregation on the micrometer scale was observed on sintering. The Vicker’s hardness tests for many of the composite and individual nanoceramics provided values with high hardness comparable with those of the individual h-GaN and c-TiN ceramics.

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Carbon‐containing droplet combustion–carbothermal synthesis of well‐distributed AlN nanometer powders

et al. 2022

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A novel three-step technique was employed to synthesize the well-distributed AlN nanopowders. First, the hollow spherical precursor particles with an average diameter of 2-5 μm, consisting of an amorphous structure mixture of Al 2 O 3 and C, was prepared by carbon-containing droplet combustion method by using glucose, urea, and aluminum nitrate as starting materials. The carbothermal reduction and nitridation (CRN) was carried out at 1500 • C under N 2 flow for 2 h and subsequently the CRN product was calcined at 700 • C in air for 1 h to remove residual carbon and transform the CRN product to high-purity AlN powders consisting of nanostructured hollow spheres. The formation mechanism of precursor and AlN hollow spheres was discussed in detail. The AlN powder exhibited well-distributed spherical particles with a size of 30-50 nm and good sinterability. After additive-free and pressureless sintering at 1800 • C for 2 h, the relative density of the sintered AlN sample was measured to be 99.02%.

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Novel nanoceramics from in situ made nanocrystalline powders of pure nitrides and their composites in the system aluminum nitride AlN/gallium nitride GaN/aluminum gallium nitride Al0.5Ga0.5N

Cited by 6 publications

References 31 publications

Composite Nitride Nanoceramics in the System Titanium Nitride (TiN)-Aluminum Nitride (AlN) through High Pressure and High Temperature Sintering of Synthesis-Mixed Nanocrystalline Powders

Composite Nitride Nanoceramics in the System Titanium Nitride (TiN)-Aluminum Nitride (AlN) through High Pressure and High Temperature Sintering of Synthesis-Mixed Nanocrystalline Powders

New Nitride Nanoceramics from Synthesis-Mixed Nanopowders in the Composite System Gallium Nitride GaN–Titanium Nitride TiN

Carbon‐containing droplet combustion–carbothermal synthesis of well‐distributed AlN nanometer powders

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