Liquid Silicon Materials

AEM of reaction-bonded SiC

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100122125 ◽

1992 ◽

Vol 50 (1) ◽

pp. 344-345

Author(s):

K Das Chowdhury ◽

R. W. Carpenter ◽

W. Braue

Keyword(s):

Mechanical Properties ◽

Phase Transformation ◽

High Temperature ◽

Epitaxial Growth ◽

Liquid Silicon ◽

Structural Ceramic ◽

Few Data

Research on reaction-bonded SiC (RBSiC) is aimed at developing a reliable structural ceramic with improved mechanical properties. The starting materials for RBSiC were Si,C and α-SiC powder. The formation of the complex microstructure of RBSiC involves (i) solution of carbon in liquid silicon, (ii) nucleation and epitaxial growth of secondary β-SiC on the original α-SiC grains followed by (iii) β>α-SiC phase transformation of newly formed SiC. Due to their coherent nature, epitaxial SiC/SiC interfaces are considered to be segregation-free and “strong” with respect to their effect on the mechanical properties of RBSiC. But the “weak” Si/SiC interface limits its use in high temperature situations. However, few data exist on the structure and chemistry of these interfaces. Microanalytical results obtained by parallel EELS and HREM imaging are reported here.

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Two-faced liquid silicon

Nature India ◽

10.1038/nindia.2011.72 ◽

2011 ◽

Keyword(s):

Liquid Silicon

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Metastable Defects in the Amorphous Silicon-Germanium Alloys

MRS Proceedings ◽

10.1557/proc-762-a2.1 ◽

2003 ◽

Vol 762 ◽

Cited By ~ 1

Author(s):

J. David Cohen

Keyword(s):

Amorphous Silicon ◽

Silicon Germanium ◽

Dangling Bonds ◽

Annealing Behavior ◽

Fundamental Properties ◽

Silicon Materials ◽

Salient Features ◽

The Individual ◽

Amorphous Silicon Germanium ◽

Silicon Germanium Alloys

AbstractThis paper first briefly reviews a few of the early studies that established some of the salient features of light-induced degradation in a-Si,Ge:H. In particular, I discuss the fact that both Si and Ge metastable dangling bonds are involved. I then review some of the recent studies carried out by members of my laboratory concerning the details of degradation in the low Ge fraction alloys utilizing the modulated photocurrent method to monitor the individual changes in the Si and Ge deep defects. By relating the metastable creation and annealing behavior of these two types of defects, new insights into the fundamental properties of metastable defects have been obtained for amorphous silicon materials in general. I will conclude with a brief discussion of the microscopic mechanisms that may be responsible.

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The Interactions of Carbon and Nitrogen in Liquid Silicon

High Temperature Materials and Processes ◽

10.1515/htmp-2013-0043 ◽

2014 ◽

Vol 33 (4) ◽

pp. 363-368 ◽

Cited By ~ 4

Author(s):

Halvor Dalaker ◽

Merete Tangstad

Keyword(s):

Silicon Nitride ◽

Carbon Source ◽

Nitrogen Content ◽

High Purity ◽

Liquid Silicon ◽

Interaction Parameters ◽

Carbon And Nitrogen ◽

Temperature Range ◽

High Purity Silicon

AbstractThe interactions between carbon and nitrogen in liquid silicon have been studied experimentally. High purity silicon was melted in silicon nitride crucibles under an Ar atmosphere with a graphite slab inserted in the crucible prior to melting as a carbon source. The system was thus simultaneously equilibrated with Si3N4 and SiC. Samples were extracted in the temperature range 1695–1798 K and analyzed using Leco.It was observed that the simultaneous saturation of nitrogen and carbon caused a significant increase in the solubilities of both elements. The interaction parameters were derived as The solubility of carbon in liquid silicon as a function of temperature and nitrogen content was found to follow: And the solubility of nitrogen in liquid silicon found to follow:

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Liquid Silicon-Monona

ACM SIGPLAN Notices ◽

10.1145/3296957.3173167 ◽

2018 ◽

Vol 53 (2) ◽

pp. 214-228 ◽

Cited By ~ 2

Author(s):

Yue Zha ◽

Jing Li

Keyword(s):

Liquid Silicon

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Persistence of Covalent Bonding in Liquid Silicon Probed by Inelastic X-Ray Scattering

Physical Review Letters ◽

10.1103/physrevlett.108.067402 ◽

2012 ◽

Vol 108 (6) ◽

Cited By ~ 50

Author(s):

J. T. Okada ◽

P. H.-L. Sit ◽

Y. Watanabe ◽

Y. J. Wang ◽

B. Barbiellini ◽

...

Keyword(s):

Covalent Bonding ◽

Liquid Silicon ◽

X Ray ◽

X Ray Scattering ◽

Ray Scattering

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Electrical Conductivity of SiC/Si Composites Obtained from Wood Preforms

Zeitschrift für Naturforschung A ◽

10.1515/zna-2011-1-218 ◽

2011 ◽

Vol 66 (1-2) ◽

pp. 134-138

Author(s):

Marco Antonio Béjar ◽

Rodrigo Mena ◽

Juan Esteban Toro

Keyword(s):

Electrical Conductivity ◽

Silicon Content ◽

Beech Wood ◽

Liquid Silicon

Biomorphic SiC/Si composites were produced from pine and beech wood, and the corresponding electrical conductivity was determined as a function of the temperature. Firstly, wood preforms were pyrolized at 1050 °C in nitrogen. Then, the pyrolized preforms were impregnated with liquid silicon and kept at 1600 °C for 2 h in vacuum. The SiC/Si composites were obtained due to the produced carbothermal reaction. As expected, the resulting electrical conductivity of these composites increased with the temperature and with the silicon content.

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