Because the volume of each corner atom is shared between adjacent cells, each BCC cell contains two atoms. Each corner atom touches the center atom. A line that is drawn from one corner of the cube through the center and to the other corner passes through 4r, where r is the radius of an atom. By geometry, the length of the diagonal is a3. Therefore, the length of each side of the BCC structure can be related to the radius of the atom by Knowing this and the formula for the volume of a sphere, it becomes possible to calculate the APF as follows: Hexagonal close-packed crystal structure HCP structure For the hexagonal close-packed HCP structure the derivation is similar.
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Because the volume of each corner atom is shared between adjacent cells, each BCC cell contains two atoms. Each corner atom touches the center atom. A line that is drawn from one corner of the cube through the center and to the other corner passes through 4r, where r is the radius of an atom. By geometry, the length of the diagonal is a3.
Therefore, the length of each side of the BCC structure can be related to the radius of the atom by Knowing this and the formula for the volume of a sphere, it becomes possible to calculate the APF as follows: Hexagonal close-packed crystal structure HCP structure For the hexagonal close-packed HCP structure the derivation is similar.
Here the unit cell is a hexagonal prism containing six atoms. Let abe the side length of its base and c be its height. Ferroelectric materials exhibit hysteresis loop analogous to ferromagnetic materials. Even after field zero there exists some polarization this is called remanent polarization. Spontaneous polarization:- The hysteresis loop of a ferroelectric material changes its shape as the temperature is increased.
Spontaneous polarization vanishes above a certain temperature called ferroelectric curie temperature For ferroelectric materials the permittivity shows a characteristic peak near the curie point T c. The memory packing density of ferroelectric materials is comparable to ferrites but their switching rates are slower than ferrites. The neighbouring dipoles are anti parallel to each other Ex:- lead zirconate, sodium niobate, ADP.
The permittivity of such materials is generally in the range of Pyroelectric materials:- is one which exhibits spontaneous polarization in the absence of an electric field and changes its polarization on heating. All pyro electrics are pyroelectric and piezo electiric. Learn more about Scribd Membership Home.
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