Piezoelectric behavior in solids, Physics

The world is derived from the Greek world which means to squeeze or press. It is usually described as the generation of electricity as a result of mechanical pressure. "When mechanical pressure is applied to any one of these materials, the crystalline structure generates a voltage which is proportional to the pressure." On the other hand when an electric field is applied, the structure changes shape creating dimensional alterations in the material only if the lattice owns no centre of symmetry, the phenomenon being called as piezoelectricity. This property is found in certain classes of crystalline materials including natural crystals of Quartz, Rochelle salt and tourmaline plus manufactured ceramics such as barium and lead

This special crystal structure has no centre of symmetry. This unit cell has a centre of symmetry. When unstressed the centre of the mass of the negative charges at the centre as shown. There is therefore no net polarization in the unit cell and p=0 when a mechanical force is applied to the cell in which the second row of charges is a line of symmetry. The distance between the second and third; the centre of mass of the negative charges still coincides with the positive charge. Hence, there is no change in the electric. This result is generally true for all crystal that has a centre of symmetry. 

Posted Date: 7/7/2012 6:38:25 AM | Location : United States







Related Discussions:- Piezoelectric behavior in solids, Assignment Help, Ask Question on Piezoelectric behavior in solids, Get Answer, Expert's Help, Piezoelectric behavior in solids Discussions

Write discussion on Piezoelectric behavior in solids
Your posts are moderated
Related Questions

Work is equal to which of the following? a) The cross product of force and displacement. b) The product of force times time c) Force divided by time d) The dot

what causes glow in fire

What is the name of the temperature and pressure conditions at which water can be in the solid, liquid and gas phases simultaneously? Ans: The name of the temperature and pr

The emf of the driver cell of a potentiometer is 2V & its internal resistance is negligible . The length of the potentiometer wire is 100cm & resistance is 5 ohm.How much resistanc

Q.  Derive Schrodinger's time dependent wave equation. What is the physical significance of wave function used in this equation? Ans. Time Dependent Schrodinger's Eq

Q.   What is "optical activity and optical rotation"? Write the laws of optical activity of optically active solution. Optical Activity If a plane polarized light is made

A solid substance has a molar volume which is  smaller than that of its liquid phase. Which of the following statements regarding the solid-liquid phase transition is/are true?

a)  A positive point test charge q 0  is placed at the midpoint p among the two equal positive charges q. What forces acts on it at or near this point p?   b)  Two charges 1X10 -

Magnetism - Basic concepts: 1. Pole strength: The ability of a pole  of  a magnet to attract or repel another magnetic pole is called its pole strength. Units : A-m 2.