Explain electrical properties of solids., Chemistry

On the basis of electrical conductivity the solids can be broadly classified into three types:

(a) Metals

(b) Insulators

(c) Semiconductors

Electrical conductivity of metals is very high and is of the order of 104 to 107 ohm-1 while that of insulators is one of the order of 10-20 to 10-10 ohm-1 m-1. Semiconductors have intermediate conductivity which lays in the range 10-8 to 104 ohm-1 m-1.

Electrical conductivity of solids may arise through the motion of electrons and positive holes (electronic conductivity) or through the motion of ions (ionic conductivity). The conduction through positive holes is called n-type conduction and through positive holes is called-type conduction. Electrical conductivity of metals is due to motion of electrons and it increases with the number of electrons available to participate in the conduction process. Pure ionic solids are those where conduction can take place only from motion of ions are insulators. Though, the presence of defects in the crystal structure raises their conductivity.

Unlike metals, the conductivity of semiconductors and insulators is mainly due to the presence of interstitial electrons and positive holes in the solids due to imperfections. The conductivity of semiconductors and insulators increases with increase in temperature whereas that of metals decreases.

 

 

Posted Date: 6/26/2012 2:37:00 AM | Location : United States







Related Discussions:- Explain electrical properties of solids., Assignment Help, Ask Question on Explain electrical properties of solids., Get Answer, Expert's Help, Explain electrical properties of solids. Discussions

Write discussion on Explain electrical properties of solids.
Your posts are moderated
Related Questions

Q. Explain about Electron-Dot Structures? Write an electron-dot structure for a impartial atom of arsenic an element used in semiconductor materials because of its electron con

IUPAC name is given to compounds. Carbon is an element so it will bw called as carbon only. eg. hydrocarbons - CH4=methane                            C2H6=Ethane

WE ARE WONDERING IF WE GOT THE ANSWER RIGHT V=d/M 0.8 G/Ml / 100G =400G

how is the filtrate prepared in basic radical testing

When the value of azimuthal quantum number is 3, magnetic quantum number can have values: (1) + 1, 0, - 1           (2) + 2, + 1, 0, - 1, - 2  (3) - 3, - 2, - 1, - 0, + 1

2. Oxalic acid is a diprotic acid with the following deprotonation equilibria. A.  You have 150 ml of a solution of pure oxalic acid with an unknown concentration.

homolytic fission

discuss the structure of beryllium chloride Becl2.

Backward reaction definion