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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
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.
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  • 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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