Understanding the growth of micro and nano-crystalline AlN by thermal plasma process

Kanhe, Nilesh S.; Nawale, Ashok B.; Gawade, Rupesh L.; Puranik, Vedavati G.; Bhoraskar, S. V.; Das, Anath Bandhu; Mathe, V. L.

doi:10.1016/j.jcrysgro.2011.11.011

Cited by 26 publications

(41 citation statements)

References 33 publications

(53 reference statements)

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“…The Al wire melts in the nitrogen discharge and an AlN layer is formed on the wire surface, similar to the appearance of an AlN layer around Al particles that are fed into a discharge in the plasma spraying technique or similar to the growth of AlN crystals on an Al ingot under the influence of heat from an electric arc . The high thermal conductivity of AlN supports further heating of the Al core and evaporation via pores in the layer.…”

Section: Discussionmentioning

confidence: 99%

“…Arc discharges with an aluminium cathode still attract continuous attention for the production of AlN. AlN powder can be produced from Al powder through a thermal inductively coupled radio frequency (RF) torch . This technology was further developed to the reactive plasma spraying method for the fabrication of AlN coatings, as recently reviewed by Shahien et al Another promising way of AlN production is the electric explosion of wires, which is based on the use of two current pulses .…”

Section: Introductionmentioning

confidence: 99%

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Design and optical study of a microwave plasma torch in nitrogen used for the evaporation of aluminium wires

Pipa

Sushentsev

Hamann

et al. 2017

Contributions to Plasma Physics

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A microwave torch in nitrogen has been designed for the evaporation of aluminium (Al) wires potentially to be used for the synthesis of aluminium nitride (AlN). The torch, created on the tip of a metallic nozzle, is compatible with vacuum conditions and can be operated in continuous mode up to atmospheric pressure. Al wires to be evaporated are fed through the axis of the nozzle. Time‐resolved photography is applied to analyse the time evolution and stability of the interaction of the Al wire with the discharge. Optical emission spectroscopy is used (a) for the determination of the gas temperature of the active discharge, which is found to be in the range 1500–3500 K depending on the experimental conditions, and (b) for the estimation of the densities of Al and N atoms in the afterglow region, which are in the range 1011–1012 and of 1013–1014 cm−3, respectively. It is found that the part of the Al wire that is directly exposed to the nitrogen torch absorbs a considerable amount of the microwave energy, supporting its evaporation. In addition, the dissociation of molecular nitrogen has to be considered as an important process of power dissipation. Further technical development of the torch is necessary for the envisaged synthesis of AlN.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Design and optical study of a microwave plasma torch in nitrogen used for the evaporation of aluminium wires

Pipa

Sushentsev

Hamann

et al. 2017

Contributions to Plasma Physics

View full text Add to dashboard Cite

show abstract

“…The schematic and details of the DCTATPR is reported in our earlier communication. [30][31][32] Pellets of commercially available particles of iron having an average grain size of few micrometers were used to make the pellets by applying pressure of 150 kg/cm 2 . The plasma reactor was evacuated to a base pressure of 10 À3 Torr and purged with argon gas so as to remove or minimize the oxygen and other gaseous impurities present in the reactor.…”

Section: Methodsmentioning

confidence: 99%

“…Previously, we have reported deterministic control for crystalline structure of TiO 2 , ZrO 2 , Al-AlN, and spinal ferrites through variation of ambient pressure and plasma power. [28][29][30][31][32] The critical role of pressure in controlling the phase structure was established through a large number of experiments followed by detailed analysis of the synthesized structures. In the present investigation, thermal plasma route was used to synthesize the Fe nanoparticles.…”

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confidence: 99%

Thermal plasma processed ferro-magnetically ordered face-centered cubic iron at room temperature

Raut

Kanhe

Bhoraskar

et al. 2014

Journal of Applied Physics

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Articles you may be interested inDistinguishing magnetic particle size of iron oxide nanoparticles with first-order reversal curves Role of inhomogeneous cation distribution in magnetic enhancement of nanosized Ni0.35Zn0.65Fe2O4: A structural, magnetic, and hyperfine studyHere, we report tailor made phase of iron nanoparticles using homogeneous gas phase condensation process via thermal plasma route. It was observed that crystal lattice of nanocrystalline iron changes as a function of operating parameters of the plasma reactor. In the present investigation iron nanoparticles have been synthesized in presence of argon at operating pressures of 125-1000 Torr and fixed plasma input DC power of 6 kW. It was possible to obtain pure fcc, pure bcc as well as the mixed phases for iron nanoparticles in powder form as a function of operating pressure. The as synthesized product was characterized for understanding the structural and magnetic properties by using X-ray diffraction, vibrating sample magnetometer, and M€ ossbauer spectroscopy. The data reveal that fcc phase is ferromagnetically ordered with high spin state, which is unusual whereas bcc phase is found to be ferromagnetic as usual. Finally, the structural and magnetic properties are co-related. V C 2014 AIP Publishing LLC.

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“…2 Kyung-In Kim, Sung-Churl Choi, Kyu-Sung Han, Kwang-Taek Hwang and Jin-Ho Kim reaction) [10][11][12], 열 플라즈마 합성법(Thermal plasma synthesis) [4,[13][14][15][16][17][18] (1 : 1) system as a function of temperature (at 1 atm). Fig.…”

mentioning

confidence: 99%

Synthesis of high purity aluminum nitride nanopowder by RF induction thermal plasma

Kim¹,

Choi²,

Han³

et al. 2014

Journal of the Korean Crystal Growth and Crystal Technology

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Aluminum nitride, which has outstanding properties such as high thermal conductivity and electrical resistivity, has been received a great attention as a substrate and packaging material of semiconductor devices. Since aluminum nitride has a high sintering temperature of 2173 K and its properties depends on the impurity level, it is necessary to synthesize high-purity and nano-sized aluminum nitride powders for the applications. In this research, we synthesized high purity aluminum nitride nanopowders from aluminum using RF induction thermal plasma system. Sheath gas (NH 3 ) flow was controlled to establish the synthesis condition of high purity aluminum nitride nanopowders. The obtained aluminum nitride nanopowders were evaluated by XRD, SEM, TEM, BET, FTIR and N-O analysis.

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Understanding the growth of micro and nano-crystalline AlN by thermal plasma process

Cited by 26 publications

References 33 publications

Design and optical study of a microwave plasma torch in nitrogen used for the evaporation of aluminium wires

Design and optical study of a microwave plasma torch in nitrogen used for the evaporation of aluminium wires

Thermal plasma processed ferro-magnetically ordered face-centered cubic iron at room temperature

Synthesis of high purity aluminum nitride nanopowder by RF induction thermal plasma

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