Production of magnesium silicide and silane from rice husk ash

Acharya, H. N.; Dutta, Swapan Kumar; Banerjee, H. D.

doi:10.1016/0165-1633(80)90032-5

Cited by 31 publications

(14 citation statements)

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“…[26][27][28] Low reaction temperatures, short reaction times, a higher amount of magnesium, as well as an experimental set-up with short distances of the silica to the Mg source in principle favor the formation of magnesium silicide during the magnesiothermic reduction. 24,27 It is, however, not possible to create freestanding 3D interconnected networks of phase pure Mg 2 Si crystallites following this procedure even with optimized reaction conditions.…”

Section: Resultsmentioning

confidence: 99%

Monolithic porous magnesium silicide

et al. 2017

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a Macroporous magnesium silicide monoliths were successfully prepared by a two-step synthesis procedure. The reaction of gaseous magnesium vapor with macro-/mesoporous silicon, which was generated from hierarchically organized meso-/macroporous silica by a magnesiothermic reduction reaction, resulted in monolithic magnesium silicide with a cellular, open macroporous structure. By adjusting the reaction conditions, such as experimental set-up, temperature and time, challenges namely loss of porosity or phase purity of Mg 2 Si were addressed and monolithic magnesium silicide with a cellular network builtup was obtained.

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Section: Resultsmentioning

confidence: 99%

Monolithic porous magnesium silicide

et al. 2017

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“…Therefore worldwide efforts are being directed to develop a low-cost, high-volume and commercially feasible process for production of high purity silicon to be used in solar cells for photovoltaic power generation [269][270][271].One such process involves reduction of rice husk ash to produce silicon.Several approaches have been developed to produce silicon from RHs. Among the various methods, reduction of amorphous silica by metallic metals has been discussed extensivelly.The metallic elements Mg, Ca, Al and Ti can reduce SiO 2 at comparatively lower temperature and forms mixtures of condensed phase products.…”

Section: High Puritysiliconmentioning

confidence: 99%

Review on the physicochemical treatments of rice husk for production of advanced materials

Soltani

Bahrami

Pech-Canul

et al. 2015

Chemical Engineering Journal

502

231

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“…Nevertheless, the high vapor pressure of Ca makes the growth of a continuous film layer by deposition from the gas phase [12][13][14][15][16][17] difficult. Ca atoms are easily evaporated from the Si substrate, which prevents the formation of Ca-silicide by interdiffusion with the Si substrate.…”

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Electrochemical Formation of Ca-Si in Molten CaCl₂-KCl

Sakanaka

Goto

Hachiya

2015

J. Electrochem. Soc.

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Electrochemical formation of a Ca-Si film in a molten CaCl 2 -KCl at 923 K was investigated. Potentiostatic electrolysis of a Si electrode at −0.10 V for 1 h resulted in the formation of a multiphase Ca-Si film having a thickness of about 30 μm. The Ca-Si film was converted into other alloy phases by anodic potentiostatic electrolysis after the cathodic electrodeposition of Ca metal at −0.10 V. The various transformation reactions and the corresponding equilibrium potentials were clarified. At 923 K, the equilibrium potential was found to be 0.18 V (CaSi 2 ). Reflectance measurements in the ultraviolet, visible, and near-infrared region clarified that the CaSi 2 film has a direct bandgap of 3.1 eV. © The Author(s) 2015. Published by ECS. This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 License (CC BY, http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse of the work in any medium, provided the original work is properly cited. [DOI: 10.1149/2.1021504jes] All rights reserved.Manuscript submitted December 11, 2014; revised manuscript received January 26, 2015. Published February 14, 2015 Compound semiconductors are among the most promising materials for use in high-power electronic and photoelectric conversion devices because of their advantages.1 However, conventional processes for preparing semiconductors involve high energy consumption and the use of hazardous starting materials, and are hence unsuitable for mass production. Therefore, a new semiconductor preparation process that does not require harmful starting materials or high energy has been proposed.Recently, metal silicides, which are abundant, non-toxic materials, have attracted much interest for use as environment-friendly semiconductors, because they are expected to show excellent optical properties. In addition, the bandgap energy of metal silicides can be extended from the infrared to the visible region by appropriate choice of metal elements and phases of the compounds. 2-5Among the numerous metal silicides reported, Ca-Si metal silicides are well known semiconductor materials that exhibit superconductive properties. For example, Ca 2 Si is a semiconductor with an energy gap of 1.9 eV, 6 while CaSi is expected to show high hydrogen storage capacity. 7 In addition, superconductivity has been discovered at 14 K under pressure in a new polymorph of the CaSi 2 stoichiometry. 8,9 Recently, there has been increased interest in the use of intermetallic silicides to replace the conventional graphite anodes in Li-ion batteries. 10,11 Films fabricated from these alloys, with arbitrary shapes and sizes, may be used in various applications such as energy conversion devices.Nevertheless, the high vapor pressure of Ca makes the growth of a continuous film layer by deposition from the gas phase 12-17 difficult. Ca atoms are easily evaporated from the Si substrate, which prevents the formation of Ca-silicide by interdiffusion with the Si substrate.With this background, we proposed a novel el...

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Production of magnesium silicide and silane from rice husk ash

Cited by 31 publications

References 1 publication

Monolithic porous magnesium silicide

Monolithic porous magnesium silicide

Review on the physicochemical treatments of rice husk for production of advanced materials

Electrochemical Formation of Ca-Si in Molten CaCl₂-KCl

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Production of magnesium silicide and silane from rice husk ash

Cited by 31 publications

References 1 publication

Monolithic porous magnesium silicide

Monolithic porous magnesium silicide

Review on the physicochemical treatments of rice husk for production of advanced materials

Electrochemical Formation of Ca-Si in Molten CaCl2-KCl

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Electrochemical Formation of Ca-Si in Molten CaCl₂-KCl