Silicon Element Silicon is a chemical element with the symbol Si and atomic number 14 and atomic mass is 28. It is a tetravalent metalloid‚ less reactive than its chemical analog carbon‚ the nonmetal directly above it in the periodic table‚ but more reactive than germanium‚ the metalloid directly below it in the table. Controversy about silicon’s character dates to its discovery; it was first prepared and characterized in pure form in 1823. In 1808‚ it was given the name silicium‚ with an -ium
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Applications of Silicon Silicon is one of man’s most useful elements. In the form of sand and clay it is used to make concrete and brick; it is a useful refractory material for high-temperature work‚ and in the form of silicates it is used in making enamels‚ pottery‚ etc. Silica‚ as sand‚ is a principal ingredient of glass‚ one of the most inexpensive of materials with excellent mechanical‚ optical‚ thermal and electrical properties. Hyperpure silicon can be doped with boron‚ gallium‚ phosphorus
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524 SILICON CARBIDE Vol. 22 SILICON CARBIDE 1. Introduction Silicon carbide [409-21-2] (SiC) is a technologically important material that is one of the small number of unusual materials that were first created synthetically and then subsequently discovered in nature. Silicon carbide was first observed in its natural form in 1905 by the Nobel-prize-winning chemist Henri Moissan‚ who discovered it in the meteor that created the Diablo Canyon in Arizona. The transparent mineral‚ now known as
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The German scientist‚ Julius Scheiner was most likely the first person to realise there was a possibility of silicon being a basis of life. This idea was then grapsed by the british scientist James Reynolds in 1893. he then pointed out that its molecular integrity withheld in high temperatures which might allow life to exist at very high temperatures. Silicon seems promising when it comes to being the basis of life‚ but when the topic is researched futher. Carbon‚ when it is oxidized during the
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PROCEEDINGS OF THE IEEE‚ VOL. 70‚ NO. 5‚ MAY 1982 Silicon as a Mechanical Material KURT E. PETERSEN‚ MEMBER‚ IEEE Abstract-Single-crystal silicon is being increasingly employed in a variety of new commercial products not because of its well-established electronic properties‚ but rather because of its excellent mechanical properties. In addition‚ recent trends in the engineering literature indicate a growing interest in the use of silicon as a mechanical material with the ultimate goal of
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History:[1][2][3][4] The story of Silicon Valley started in 1938 with the brilliant Stanford University professor of electrical engineering‚ Frederick Terman. Teaching radio engineering‚ he encouraged his students to work for local companies and to start businesses of their own. It troubled him that his best graduates had to go to the East Coast to find employment‚ especially in the field of radio engineering. His solution was to establish the then-new radio technology locally. Among
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the century‚ the region of Northern California we call Silicon Valley‚ was known as the Valley of Heart’s Delight. At that time it was better known for its apricots and walnuts than for its cutting-edge technology. The first time the term Silicon Valley was used‚ was in 1971 when a journalist wrote a couple of articles in Electronic News‚ a weekly electronic industry tabloid‚ about the semiconductor-industry around Palo Alto‚ California. Silicon Valley has since then transformed into a region filled
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The present invention relates to a used for pulling silicon single crystal quartz glass crucible‚ which comprises a with the opening and closing the aperture dense sintering zone quartz glass body‚ in the quartz glass body inside the airtight glaze‚ lateral with porous. The present invention relates to a method for manufacturing quartz glass crucible crucible‚ wherein at least a portion of an inner layer of the substrate‚ wherein the crystallization promoter to promote the formation of cristobalite
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Word Count 504 Easily Made Silicon-based Chemicals from Sand I believe this new process of creating silicon-based chemicals from sand will revolutionize the industry by decreasing costs and increasing productivity. University of Michigan Professor and materials scientist‚ Richard Laine‚ discovered a relatively non-toxic and inexpensive way of producing a many different kinds of silicon-based chemicals. This Process uses sand or rice hull ash and antifreeze to create needed chemicals while
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This is the story of the growth of the personal computer industry. The movie while based on historical fact‚ did alter things a bit for dramatic reasons. The Movie begins with IBM in the early 1980’s‚ the big brother in the computer world that everyone else feared. Everyone dressed alike at IBM‚ company songs and jingles filled the air‚ and men in suits were everywhere. Steve Jobs along with his friend who he calls "Waz" delight in working with computers. They eventually form their own company
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