Cold ignition of combustion-like waves of cryo-chemical reactions in solids

Pumir, Alain; Barelko, V. V.

doi:10.1007/pl00011137

Cited by 6 publications

(5 citation statements)

References 8 publications

(18 reference statements)

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“…As a consequence of the heat loss influence, the occurence of explosive crystallization depends on the thickness of the crystallizing film, among other parameters. The concept of a minimum necessary layer thickness appears in Coffin & Johnston (1934); Gilmer & Leamey (1980); Johnson et al (2008); Kurtze et al (1984); Pumir & Barelko (2001); Sharma et al (1984); Shklovskij & Kuz'menko (1989); Takamori et al (1972). An interesting way of experimentally determining this critical thickness by using a layer of varying thickness is demonstrated in .…”

Section: Heat Loss Influencementioning

confidence: 99%

Explosive Crystallization in Thin Amorphous Layers on Heat Conducting Substrates

Buchner

Schneider

2010

2010 14th International Heat Transfer Conference, Volume 3

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The self-sustaining process of transformation from an amorphous state to the crystalline state is considered. The crystallizing layer, which is mounted on a substrate, is assumed to be very thin. Thus the energy balance for the layer reduces to the equation of one-dimensional heat diffusion with a source term due to the local liberation of latent heat and a heat loss term due to thermal contact with the substrate. The crystallization rate is determined by a rate equation based on the crystallization theory due to A.N. Kolmogorov and M. Avrami. Heat conduction in the substrate is described by introducing a continuous distribution of moving heat sources at the interface. The problem is solved numerically with a collocation method. The propagation speed of the crystallization wave is obtained as an eigenvalue. Dual solutions are found below a critical value of a non-dimensional heat-loss parameter, whereas no solution exists above that value.

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Section: Heat Loss Influencementioning

confidence: 99%

Explosive Crystallization in Thin Amorphous Layers on Heat Conducting Substrates

Buchner

Schneider

2010

2010 14th International Heat Transfer Conference, Volume 3

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“…Owing to the influence of heat loss, the development of EC is related to the thickness of the thin film. It has been discovered that a minimum necessary layer thickness is required. − As the thin film thickness decreases, the triggering of the crystallization becomes challenging . For example, approximately ∼30% of the latent heat liberated from the amorphous Ge thin film’s crystallization is lost to the substrate .…”

Section: Resultsmentioning

confidence: 99%

Explosive Crystallization Characteristic of Ge–Cu–Te Thin Films for Phase-Change Memory

Wang

Chen

2023

Crystal Growth & Design

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Ge–Cu–Te thin films were investigated experimentally for their initial crystallization characteristics and their correlation with electrical behaviors as phase-change materials for application in phase-change random access memory (PCRAM). Explosive crystallization (EC) with random orientation was observed as an initiating effect on crystallization during the early stage of crystallization for Ge–Cu–Te thin films. Both the tetrahedral coordination environment and triangular Cu atoms clusters consisting of threefold rings for Ge–Cu–Te thin films contribute to the initiation of EC. Crystallization progresses from the surface toward the bulk of the thin films, resulting in grain growth through the thickness of the thin films. Thicker films can encourage EC by reducing heat loss and producing a thicker liquid layer as a result of more significant temperature gradients near the phase-change front. Moreover, providing additional external heat by extending the annealing time also pushes EC. Finally, electrical transport measurements using the Hall system demonstrated that conductivity is increased by a more continuous EC network that concentrates more carriers. The authors consider that the above results are beneficial for understanding the phase-change mechanism of Ge–Cu–Te phase-change materials.

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“…A more refined description of the dynamics of the fracture, a crucial aspect of this work, has been used here (cf. [18] - [20]). While the results obtained here generally confirm the picture obtained with the help of simpler models, it allows us to address more realistically a number of questions.…”

Section: Discussionmentioning

confidence: 99%

“…In the previous works [18] - [20], the authors developed a model based on a heat equation with the source term depending of the temperature gradient. In this work, we suggest a more complete model which includes heat transfer, destruction of the sample and production of active centers.…”

Section: Thermal Mechanism Of Propagationmentioning

confidence: 99%

“…It is based on the assumption that brittle fracture is induced by thermal stress due to heat production because of the exothermal chemical reaction. This study is continued in [20] by the investigation of bifurcation phenomena and critical conditions with another mechanism of wave propagation. It takes into account the density change between the initial reagents and the products of reaction.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Travelling Waves of Fast Cryo-chemical Transformations in Solids (Non-Arrhenius Chemistry of the Cold Universe)

Barelko

Bessonov

Kichigina

et al. 2008

Math. Model. Nat. Phenom.

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Abstract. Propagation of chemical waves at very low temperatures, observed experimentally [1] at velocities of order 10 cm/s, is due to a very non-standard physical mechanism. The energy liberated by the chemical reaction induces destruction of the material, thereby facilitating the reaction, a process very different from standard combustion. In this work we present recent experimental results and develop a new mathematical model which takes into account mechanical and chemical processes. We carry out numerical simulations and suggest a simplified model in order to obtain an explicit expression for the wave speed. This modelling allows us to give a possible explanation of the existence of two modes of propagation observed experimentally and of the dependence of the speed of propagation on the radiation dose.

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Cold ignition of combustion-like waves of cryo-chemical reactions in solids

Abstract: PACS. 05.70.Ln Nonequilibrium and irreversible thermodynamics – 82.60.Nh Thermodynamics of nucleation – 82.33.Pt Solid state chemistry,

Cited by 6 publications

References 8 publications

Explosive Crystallization in Thin Amorphous Layers on Heat Conducting Substrates

Explosive Crystallization in Thin Amorphous Layers on Heat Conducting Substrates

Explosive Crystallization Characteristic of Ge–Cu–Te Thin Films for Phase-Change Memory

Travelling Waves of Fast Cryo-chemical Transformations in Solids (Non-Arrhenius Chemistry of the Cold Universe)

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