Formation mechanism of 21R AlN-polytypoids in aluminothermic reduction and nitridation process

Li, Y. W.; Zhou, Guifeng; Jin, Shengli; Li, N.

doi:10.1007/s10853-006-0027-6

Cited by 5 publications

(8 citation statements)

References 11 publications

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“…The sampling time t 1 was increased in steps from 0.2 ms to 9 ms, while t 2 was taken as 4t 1 . Li 19 details the principles and modeling of the I-DLTS technique. The errors in energy measurements are 5% to 10%.…”

Section: Methodsmentioning

confidence: 99%

Point Defects in CdZnTe Crystals Grown by Different Techniques

Gul

Bolotnikov

Kim

et al. 2011

Journal of Elec Materi

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We studied, by current deep-level transient spectroscopy (I-DLTS), point defects in CdZnTe detectors grown by different techniques. We identified 12 different traps with energy levels from 7 meV to 1.1 eV. Although the levels of most of the identified defects were independent of the crystal growth techniques, nevertheless there were some associated differences in the traps' energies and densities.

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Section: Methodsmentioning

confidence: 99%

Point Defects in CdZnTe Crystals Grown by Different Techniques

Gul

Bolotnikov

Kim

et al. 2011

Journal of Elec Materi

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“…Ji et al [17] reported that the pea-like grain could be regarded as the precursor grains of SiAlON whiskers. It was interesting to obtain the formation mechanism of β-SiAlON, which prefers a documented vapour-liquid-solid (VLS) (Figure 5) mechanism of β-SiAlON formation from a previous reported research [20][21][22]. The process of producing β-SiAlON was as follows: (1) forming the Si-Al-P liquid, including Si, Al, impurity like Fe at lower temperatures; (2) the dissolution of gas, such as…”

Section: Microstructure and Morphology Of Different Samples From Zirc...mentioning

confidence: 99%

“…Besides, a small amount of ZrO 2 was converted to ZrN and β-SiAlON was gradually produced in the case of carbon coke. Moreover, Li et al [20] proposed a method that was utilised to quasi-quantitatively estimate the phases produced in the products, which depended on relative diffraction peak intensities of the phases to be characterised. Thus, when carbon coke was used as the reducer, the relative content of ZrN was more than that of ZrN in the case of carbon black and Al powder.…”

Section: Effect Of Reducers On Phase Transformation Of Zircon and Bau...mentioning

confidence: 99%

Section: Thermodynamic Analysis Of Crn and Arn Of Zircon And Bauxitementioning

confidence: 99%

“…The standard Gibbs free energies of some compounds involved in reactions ( 10)-( 20) are shown in Table 2 [20,[26][27][28]. Furthermore, the standard free energies of reactions (equations (11)(12)(13), (17)(18)(19)(20)) could be calculated utilising the equations listed in Table 2. Besides, when the value of ΔG θ from the formula ΔG θ = Δ f G θ + RTIn P CO /P u P N 2 /P u (ΔG θ represents Standard Gibbs free energy; T represents temperature; the term P N2 and P CO means partial pressure of N 2 and CO, respectively; and P θ represents standard atmospheric pressure) equals to 0, the system, including reactants and products, could reach an equilibrium state.…”

Section: Thermodynamic Analysis Of Crn and Arn Of Zircon And Bauxitementioning

confidence: 99%

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Carbothermal/aluminothermic reduction nitridation synthesis of ZrN–SiAlON refractory composites from zircon and bauxite: a comparative study of the reduction effect of reducers

Zhang

Zhao

et al. 2017

Advances in Applied Ceramics

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The ZrN-SiAlON composite refractory powder was successfully synthesised from zircon and bauxite minerals by the carbothermal reduction nitridation or the aluminothermic reduction nitridation method with three typical reducers, including carbon coke, carbon black and aluminium powder. The effect of reaction temperatures on phase composition and microstructure was investigated using X-ray diffraction and a scanning electron microscopy (SEM), respectively. The thermodynamics equilibrium relationships of the condensed phases were analysed as well. The results showed that carbon coke was the most optimum reducer and when it was used as the reducer, the main final products were granular ZrN with a little β-SiAlON. Nevertheless, ZrO 2 was produced during reduction at 1600°C when the reducer was carbon black, because the activity of carbon black was the poorest. Additionally, more byproducts were produced in the case of Al powder used as reducer at 1600°C, such as AlN polytype and Al 2 O 3 .

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Effects of Added Al Powder on the Properties of Sialon-ZrN Composites Fabricated by Aluminothermic Reduction and Nitridation

Duan³

et al. 2015

Interceram. - Int. Ceram. Rev.

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Formation mechanism of 21R AlN-polytypoids in aluminothermic reduction and nitridation process

Cited by 5 publications

References 11 publications

Point Defects in CdZnTe Crystals Grown by Different Techniques

Point Defects in CdZnTe Crystals Grown by Different Techniques

Carbothermal/aluminothermic reduction nitridation synthesis of ZrN–SiAlON refractory composites from zircon and bauxite: a comparative study of the reduction effect of reducers

Effects of Added Al Powder on the Properties of Sialon-ZrN Composites Fabricated by Aluminothermic Reduction and Nitridation

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