Ionic polarization, Physics

Assignment Help:

The contribution of ionic polarization takes account of the fact that when in a molecule some of the atoms have an excess positive or negative charge (resulting from the ionic character of the bonds),an electric field tend to shift positive ions relative to negative ones. This leads to an induced moment of other origin from the moment induced by electron clouds shifting relative to nuclei. In this case a solid material should have some ionic character. It then automatically has internal dipoles, exactly cancels each other and is unable to rotate. The external field them induces net dipoles by slightly displacing the ions from their rest position. The paradigmatic materials are simple ionic crystal like NaCl. The polarization of a given volume, though, is exactly zero as for every dipole moment there is a neighbouring one with exactly the same magnitude, but with opposite sign. Note that the dipoles cannot dipoles, their direction is permanent. In electric field, the ions feel forces in opposite directions. The Na+ ions moved a bit to the right, the Chlorine ions to the lift. The dipoles moments between adjacent NaCl pairs in field direction are now different and there is a net dipole moment in a finite volume now. It can be observed that it is enough to take one dipole in field direction.


Related Discussions:- Ionic polarization

Electricity, help by post offoce box explan rasistance of a wire

help by post offoce box explan rasistance of a wire

Circular motion, In an amusement park ride called The Roundup, passengers s...

In an amusement park ride called The Roundup, passengers stand inside a 19.0 -diameter rotating ring. After the ring has acquired sufficient speed, it tilts into a vertical plane.

Automotive cruise control system, . Introduction to the topic. Research the...

. Introduction to the topic. Research the topic of cruise control systems in a historical context and identify the complex mechanical and electrical hardware involved in implementi

How is coiled, How is coiled, twisted or roped fibers terminated? Gener...

How is coiled, twisted or roped fibers terminated? Generally terms the same techniques as with PMMA apply, because this optics are no more that 0,75mm diameter PMMA fibers bunc

Define distance, The real length of path traversed by a body in a sub inter...

The real length of path traversed by a body in a sub interval of time is called as distance. It is the real path travelled by an object among its final and initial positions. It is

What do you mean by dispersion, What do you mean by dispersion? Describe a ...

What do you mean by dispersion? Describe a physical quantity which depends only on the material of the prism for its dispersion. Get an expression for it.

Explain any one of the drawbacks of rutherford atom model, Q. Explain any o...

Q. Explain any one of the drawbacks of Rutherford atom model. As-per to the classical electromagnetic theory the accelerating electron must radiate energy at a frequency propo

Write the expression for the equivalent focal length, Write down the expres...

Write down the expression for the equivalent focal length of two thin lenses separated by a distance and illustrate the terms.

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd