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

Motion, #question. third law of motion.

#question. third law of motion.

Projectile motion, in some case we take y=-g but in some case we take y=g.....

in some case we take y=-g but in some case we take y=g... why???

Magnetism, what is the magnetic field at a distance l from the centre of th...

what is the magnetic field at a distance l from the centre of the circle of radius r which carries a current i

Define types of sound waves, According to their frequencies, waves are sepa...

According to their frequencies, waves are separated into three categories: (1) Audible or sound waves : Range 20 Hz to 20 KHz. These are formed by vibrating bodies like as voc

Excitation energy and potential, When the electron is known energy from ext...

When the electron is known energy from external source, it goes to higher energy level. This process is called as excitation. The minimum energy needed to excite an atom is know

Kinematics, an aeroplane is moving horizontally with a velocity of u . it d...

an aeroplane is moving horizontally with a velocity of u . it drops a packet from a height h. the time taken the packet in reaching the ground is?

Compute the current in long straight wire, The magnetic induction at a poin...

The magnetic induction at a point 15 cm from a long straight wire carrying a current is 4 X 10 -6 T Compute the current. (J - 12) B = μ o I/2πa I = 2πa X B/μo Current I

Thermoelectric power:, The rate of modification of thermo emf with the chan...

The rate of modification of thermo emf with the change in the temperature of the hot junction is known as thermoelectric power.

What is cardiac output, What is cardiac output? Cardiac output is the v...

What is cardiac output? Cardiac output is the volume of blood the heart pumps within a minute. Cardiac output (CO) is equivalent to the stroke volume (SV) of the heart multipli

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