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

the structure of a periodic table

Ionic bonds are usually formed by combination of elements with: (1) High ionisation potential and low electron affinity (2) Low ionisation potential and high electron affini

The compound in which cation is isoelectronic with anion is : (1) NaCl                (2) CsF       (3) NaI                               (4) K 2 S Ans: K 2 S

Hydrogen Peroxide Hydrogen peroxide is the other important hydride of oxygen. The oldest method of its preparation is by the action of dilute sulphuric acid on barium peroxide

Q. Concentration factors affecting taste quality? There is a specific range at which the tasteful substances should be used. The concentration required for identification is

Q. Explain about Pyrometallurgy? Tri pyrometallurgy, the concentrated ore is heated up to a high temperature and reduction is done with a appropriate reducing agent. The differ

Which of the following statements is not correct for an electron that has the quantum numbers n=4   and m =2: (1)  The electron may have the quantum number s= +1/2 (2) The e

Explain in words why hydroboration leads to anti-Markovnikov addition of hydrogen whereas most electrophilic addtions to alkenes result in Markovnikov addition.