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Alloys PowerPoint PPT Presentation


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By Samantha Thomas . Alloys . Alloys . Alloy - a solid combination of atoms of two or more atoms . The alloys are composed of “solid solutions” of two or more minerals

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Alloys

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By samantha thomas

By Samantha Thomas

Alloys


Alloys

Alloys

  • Alloy- a solid combination of atoms of two or more atoms .

  • The alloys are composed of “solid solutions” of two or more minerals

  • Thus one important strategy for modifying the properties of metals is to produce alloys , which have properties that differ from those of the component elements.


Semiconductors

Semiconductors

  • Semiconductors -solid substance , such as silicon , with electrical conductivity between that of conductors and nonconductors at normal temperatures.

  • Semiconductors lay somewhere in between metals and nonmetals.

  • Semiconducting properties include geranium , tin , gallium arsenide , and cadmium sulfide.

  • Can be a metalloid !!


Doping

Doping

  • Doping- creates a situation in the solid silicon that allows charge carriers

  • Either electrons or tiny regions of positive charge –to become mobilized within the crystal.

  • This greatly improves silicon’s semiconductor charateristics.


Google

Google: ___________

  • Definition: An alloy is a substance made by melting two or more elements together, at least one of them a metal. An alloy crystallizes upon cooling into a solidsolution, mixture, or intermetalliccompound.

  • This definition is from : http://chemistry.about.com/od/dictionariesglossaries/g/defalloy.htm


Review questions

Review questions :

  • What is a alloy?

  • Is a metalloid a semiconductor ?


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