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

Explain negative acceleration, NEGATIVE ACCELERATION OR RETARDATION OF DECL...

NEGATIVE ACCELERATION OR RETARDATION OF DECLERATION: If velocity of a body is reducing, then its acceleration is said to be negative. The direction of negative acceleration is

Projectile motion, formula for height in a horizontal projection on an incl...

formula for height in a horizontal projection on an inclined plane?

Free body diagram, illustrate the situation. the child is on the slide

illustrate the situation. the child is on the slide

Electrostatics, what is the significne of electric field?

what is the significne of electric field?

Electrical Symbols, how does electrical symbols positively affects in our E...

how does electrical symbols positively affects in our Electrical subjects

Henry, Henry; H (after W. Henry, 1775-1836): The derived SI unit of in...

Henry; H (after W. Henry, 1775-1836): The derived SI unit of inductance, described as the inductance of a closed circuit wherein an electromotive force of 1 V is generated whe

Motor, illustrate the parts and function of motor

illustrate the parts and function of motor

What is instantaneous speed and velocity, Instantaneous velocity and speed ...

Instantaneous velocity and speed are explained at a certain instant and are shown by

Compound pendulum, the centre of oscillation of a meter stick suspended abo...

the centre of oscillation of a meter stick suspended about a transverse axis is located at the 10cm mark.Determine at what other positions could the meter stick be suspended and ha

Determine about the stacking fault, Determine about the Stacking fault     ...

Determine about the Stacking fault       Stacking faults happen in a number of crystal structures, but the common example is in close-packed structures.  Face-cantered cubic (f

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