Formation of cubic silicon nitride from the low-pressure phase by high-temperature shock compression

Yakushev, V. V.; Zhukov, A. N.; Уткин, А. В.; Rogacheva, A. I.; Kudakin, V. A.

doi:10.1134/s0010508215050123

Cited by 9 publications

(3 citation statements)

References 6 publications

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“…The beginning of the phase transition for AlN is determined at pressure of 20 GPa, as well as for Si 3 N 4 -at 30 GPa. The beginning of the phase transition is assumed in the pressure range 33-36 GPa for a mixture of Si 3 N 4 and potassium bromide KBr in a ratio of 10/90 by weight in[50]. The phase transition from β -Si 3 N 4 tin c-Si 3 N 4 is discovered above 36 GPa[28].…”

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confidence: 99%

Thermodynamic parameters of mixtureswith silicon nitride under shock-wave loading

Maevskii¹

2019

MathMon

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confidence: 99%

Thermodynamic parameters of mixtureswith silicon nitride under shock-wave loading

Maevskii¹

2019

MathMon

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“…High temperature is important along with pressure in the formation of γ-Si3N4. The promising method of hightemperature shock compression is used to research phase transition in silicon nitride and achievements of γ phase [5]. This method allows increasing the substance's temperature during compression, thereby promoting the transformation, and significantly reducing the residual temperature after the pressure drop, thereby ensuring quenching of the new phase.…”

Section: Introductionmentioning

confidence: 99%

“…It should be noted, that the model TEC uses the parameters of the equation of state of the components and hence allows considering the interaction of mixture components, unlike the mixed method, which is mainly used for high-density mixtures [5].…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic parameters of mixtures with allowance for phase transition components under shock-wave loading

Кинеловский¹,

Maevskii²

2017

Epitoanyag - JSBCM

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the shock-wave synthesis and compaction using powder mixtures are the one of perspective directions of new materials creation. the results of numerical experiments on modeling of shock wave loading of mixtures with allowance for phase transition components in their composition are presented. the significant change in volume in the region of phase transition components included in the mixtures allows us to expand the range of variation of thermodynamic parameters of the mixtures under shock wave loading. the calculation model is based on the assumption that all components of mixture under shock-wave loading are in thermodynamic equilibrium (model tec). the model tec allows us to describe the region of the polymorphic phase transition, considering the material in the region of phase transition as a mixture of low-pressure phase and high-pressure phase. the good agreement of these model calculations with the data of different authors defined on the basis of experiments is obtained. thermodynamic parameters of the nitrides mixture, solid and porous mixtures with quartz as component were reliably described. this model is useful for determining the compositions and volume fractions of the components of the mixture to obtain the specified parameters of solid and porous materials under shock-wave loading.

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Superhard Materials

Riedel

Wiehl

Zerr

et al. 2017

Handbook of Solid State Chemistry

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The search for superhard materials is motivated by technical applications under extreme conditions. The term "superhard" usually denotes materials with Vickers hardness (HV) larger than 40 GPa. This chapter presents some classes of hardest compounds, and concentrates on novel nitrides and some carbides and carbonitrides. It summarizes the latest developments in modeling and synthesis as well as potential properties of advanced materials with super‐ and ultrahard mechanical properties. The chapter presents a short overview of hardness and elastic properties. The elastic properties of an isotropic homogeneous solid can be described by any two of the four quantities: Young's modulus, shear (or rigidity) modulus, bulk modulus, Poisson's ratio. The process of hardness determination involves various mechanisms, among which are volume compression, shear deformation, bond breaking, and creation and motion of dislocations. The phenomenological correlations between hardness and elastic properties of a material serve excellently to estimate hardness of a single crystal.

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Formation of cubic silicon nitride from the low-pressure phase by high-temperature shock compression

Cited by 9 publications

References 6 publications

Thermodynamic parameters of mixtureswith silicon nitride under shock-wave loading

Thermodynamic parameters of mixtureswith silicon nitride under shock-wave loading

Thermodynamic parameters of mixtures with allowance for phase transition components under shock-wave loading

Superhard Materials

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