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

What do you mean by photo electric effect, What do you mean by photo electr...

What do you mean by photo electric effect? Show the laws of photoelectric effect. Illustrate these laws using Einstein's equation of photo electric effect?

Final Problem, A 1.6 kg man swings from a 2 meter rope at an angle of 45 de...

A 1.6 kg man swings from a 2 meter rope at an angle of 45 degrees after swinging 20 degrees past the center point, the rope is cut by a razor. The man goes flying through the air

What is ionisation potential energy, Q. What is ionisation potential energy...

Q. What is ionisation potential energy? For hydrogen atom the energy necessary to remove an electron from first orbit to its outermost orbit (n=∞) is 13.6-0 = 13.6eV. This ene

Illustrate the working of optical-fiber infrasound sensors, Illustrate the ...

Illustrate the working of Optical-Fiber Infrasound Sensors. Optical-Fiber Infrasound Sensors: It is example of Mach-Zchnder Interferrometer. Optical-fiber infrasound sensors

Lab question, figure of merit: amount of current through a conductor per un...

figure of merit: amount of current through a conductor per unit deflection and why? the name figure of merit

State the demerits of ultrasonic magnetostriction method, Illustrate the de...

Illustrate the demerits of ultrasonic magnetostriction method. Limitations of ultrasonic magnetostriction method: a. This can produce frequencies up to 3 MHz simply. b.

What are the applications of heterojunction laser, What are the application...

What are the applications of Heterojunction Laser? Applications of Heterojunction laser: a. Into consumer electronics, semiconductor lasers are utilized in VCD/CD /DVD playe

Newtons laws concept, tiger woods can hit a golf ball with 55n of force how...

tiger woods can hit a golf ball with 55n of force how hard does the ball hit back on the club

Geometric optics, why does our image in the mirror not appear upside down

why does our image in the mirror not appear upside down

Nicol prism, Working of nicol prism and its uses as polarizer and analyzer

Working of nicol prism and its uses as polarizer and analyzer

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