Combustion synthesis of hexagonal AlN–SiC solid solution under low nitrogen pressure

Juang, Rei-Cheng; Chen, C.-C.; Kuo, John; Huang, Tao; Li, Y.-Y.

doi:10.1016/j.jallcom.2009.02.102

Cited by 10 publications

(2 citation statements)

References 18 publications

(19 reference statements)

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“…In order to investigate the effect of SiC content on the crystal cell parameters (a and c) of the SiC-AlN ss phase, the ne scans were carried out from 58 to 61 around the (110) peak for a, 38,39 and from 35 to 37 around the (002) peak for c. 40 The diffraction peaks at $36 shis to a lower angle, and the peaks at $59.5 rst decreases and then increase in a narrow range with the increase of SiC content, as shown in Fig. 3(b).…”

Section: Resultsmentioning

confidence: 99%

Synthesis, crystal structure and photoluminescence of novel blue-emitting Eu²⁺-doped (SiC)_x–(AlN)_1−xphosphors by a nitriding combustion reaction

Shi

Wei

et al. 2014

RSC Adv.

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Graphical Abstract:Highlight: Novel blue-emitting (SiC) x -(AlN) 1-x :yEu 2+ phosphors were synthesized by nitriding combustion reaction, and their luminescence properties, thermal stability and possible doping site of Eu 2+ in (SiC) x -(AlN) 1-x lattice were investigated. AbstractNovel blue-emitting phosphors with the chemical composition of (SiC) x -(AlN) 1-x :yEu 2+ (x=0.06-0.50, y=0.001-0.01) were synthesized by a nitriding combustion reaction route, and the crystal structure, luminescence properties and thermal stability of the (SiC) x -(AlN) 1-x :yEu 2+ phosphors were investigated by theoretical and experimental approaches. Fist-principles calculation results prove that the solid solution of SiC with AlN promotes the doping of Eu 2+ ions into the (SiC) x -(AlN) 1-x host lattice, and Eu 2+ ions tend to occupy Al sites of the host. The synthesized (SiC) x -(AlN) 1-x :yEu 2+ phosphors absorb light in the region of 250-425 nm and show a single and symmetric broadband emission centered at about 470 nm due to the 4f 6 5d-4f 7 transitions of Eu 2+ . The luminescence intensity increases with the SiC content and reaches its maximum at x=0.20. The critical quenching concentration of Eu 2+ in the (SiC) 0.20 -(AlN) 0.80 :yEu 2+ phosphor is about y=0.006. The composition-optimized (SiC) 0.20 -2 (AlN) 0.80 :0.006Eu 2+ phosphor shows a small thermal quenching, retaining the luminance of 91.1% at 150 °C. The CIE coordinates were measured as (0.135, 0.167) with high color purity.The above results indicate that (SiC) x -(AlN) 1-x :yEu 2+ is a promising candidate as a blue-emitting ultraviolet convertible phosphor for white LEDs, and the combustion reaction route is expected to be applicable to synthesis of the present and other kinds of nitride phosphors. IntroductionWhite light emitting diodes (LEDs) have attracted increasing attention as a promising light source for solid state lighting due to their long lifetime, high luminous efficiency, energy saving, and environmental friendly characteristics. 1-3 Typically, commercial white LEDs can be generated by the combination of a blue LED chip and the famous yellow phosphor, YAG:Ce 3+ . 4 However, the disadvantages of this method are a low color-rendering index (CRI) and high correlated color temperature (CCT) due to red emission deficiency in the visible spectrum.During the last several years, white LEDs fabricated by using ultraviolet (UV)/near-ultraviolet (n-UV) chips coupled with blue, green and red phosphors have attracted much attention because of the advantageous of color stability and excellent color rending. 5-7 Therefore, the exploration of novel phosphors with strong absorption, desirable emission/excitation, and high efficiency under UV/n-UV excitation plays an important role in the development of white LEDs.Furthermore, low fabrication cost, low thermal quenching as well as high chemical stability are also required for the phosphors.As a highly efficient activator with allowed 4f-5d transitions, Eu 2+ ion has been widely investigated for the rare-earth-doped phos...

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Section: Resultsmentioning

confidence: 99%

Synthesis, crystal structure and photoluminescence of novel blue-emitting Eu²⁺-doped (SiC)_x–(AlN)_1−xphosphors by a nitriding combustion reaction

Shi

Wei

et al. 2014

RSC Adv.

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“…Важной задачей в решении проблемы создания материалов и изделий на основе твердых растворов (AlN) x (SiC) 1-x является синтез поликристаллической керамики с образованием непрерывных твердых растворов в виде как порошков, так и плотных компактов [8][9][10][11]. Известны работы, посвященные использованию процесса горения для получения порошков (AlN) x (SiC) 1-x [12,13], а также их синтеза с последующим спеканием или горячим прессованием [14][15][16].…”

Section: Introductionunclassified

Study into the feasibility of obtaining dense materials based on AlN-SiC solid solution in one stage by SHS gasostatiс processing

Akopdzhanyan

Chemagina

Borovinskaya

2020

Izv. VUZ. Poroshk. Met.

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The synthesis and sintering of the (AlN)x(SiC)1–x solid solution were studied under the conditions of SHS gasostatiс processing at high nitrogen gas pressures (up to 110 MPa). Phase formation during the combustion of aluminum and silicon carbide mixtures with the different amount of a combustible component (aluminum content is 35 to 60 wt.%) was studied. It was shown that the optimal amount of aluminum mixed with silicon carbide to obtain a single-phase solid solution (with the complete Al conversion to AlN and without SiC dissociation) is 45–50 wt.%. A mixture with 55–60 wt.% Al leads to excessively high temperatures, which in turn leads to the silicon carbide decomposition to Si + C elements. The optimal parameters for obtaining a dense material in one stage were determined. The measured porosity and density of materials obtained demonstrated that preforming is essential for the final density of samples containing 50 wt.% Al: maximum density was achieved at a preforming pressure of 10 MPa. It was found that the 5 wt.% yttrium oxide additive increases the material density by almost 10 %. A similar effect is also obtained by increasing the initial gas pressure from 80 to 110 MPa. The maximum density in this case reached 2.7 g/cm3, i.e. 83 % of the theoretical density. The total volumetric shrinkage of the material was 10 ± 0.5 %, and this indicator can be almost completely smoothed over by the 3 wt.% boron additive. The microhardness of samples was 2000 kg/mm2.

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Densification of SiC with AlN‐Nd ₂ O ₃ Sintering Additives

Wu¹,

Jiang²,

Wenzhou³

et al. 2013

Mechanical Properties and Performance of Engineering Ceramics and Composites VIII

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Combustion synthesis of hexagonal AlN–SiC solid solution under low nitrogen pressure

Cited by 10 publications

References 18 publications

Synthesis, crystal structure and photoluminescence of novel blue-emitting Eu²⁺-doped (SiC)_x–(AlN)_1−xphosphors by a nitriding combustion reaction

Synthesis, crystal structure and photoluminescence of novel blue-emitting Eu²⁺-doped (SiC)_x–(AlN)_1−xphosphors by a nitriding combustion reaction

Study into the feasibility of obtaining dense materials based on AlN-SiC solid solution in one stage by SHS gasostatiс processing

Densification of SiC with AlN‐Nd ₂ O ₃ Sintering Additives

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Combustion synthesis of hexagonal AlN–SiC solid solution under low nitrogen pressure

Cited by 10 publications

References 18 publications

Synthesis, crystal structure and photoluminescence of novel blue-emitting Eu2+-doped (SiC)x–(AlN)1−xphosphors by a nitriding combustion reaction

Synthesis, crystal structure and photoluminescence of novel blue-emitting Eu2+-doped (SiC)x–(AlN)1−xphosphors by a nitriding combustion reaction

Study into the feasibility of obtaining dense materials based on AlN-SiC solid solution in one stage by SHS gasostatiс processing

Densification of SiC with AlN‐Nd 2 O 3 Sintering Additives

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Synthesis, crystal structure and photoluminescence of novel blue-emitting Eu²⁺-doped (SiC)_x–(AlN)_1−xphosphors by a nitriding combustion reaction

Synthesis, crystal structure and photoluminescence of novel blue-emitting Eu²⁺-doped (SiC)_x–(AlN)_1−xphosphors by a nitriding combustion reaction

Densification of SiC with AlN‐Nd ₂ O ₃ Sintering Additives