State differences between primitive cells and unit cells, Chemistry

Assignment Help:

What are similarities and differences of primitive cells and unit cells? 

Ans:  Unit  cell  is  the  basic  building  block  of  a  crystal,  repeated  infinitely  in  three dimensions.

It's characterized by the three vectors (a, b, c) that form edges of a parallelopiped and the angles between the vectors (alpha, angle between b and c; beta, the angle between a and c; gamma, angle between a and b).

A primitive cell is a unit cell built on the basis vectors of a primitive basis of direct lattice, namely a crystallographic basis of the vector lattice L such that each lattice vector t of L may be obtained as an integral linear combination of basis vectors, a,  b,  c. It comprise only one lattice point and its volume is equal to the triple scalar product (a, b, c).

Non-primitive bases are used usually to illustrate centered lattices. In that case, unit cell is a multiple cell and it contains more than one lattice point. Multiplicity of the cell is given by the ratio of its volume to volume of a primitive cell.

 


Related Discussions:- State differences between primitive cells and unit cells

Atomic absorption, why is AAS used to determine lead content in soil

why is AAS used to determine lead content in soil

The number of electrons that can be accommodated, The number of electrons t...

The number of electrons that can be accommodated in dz 2  orbital: (1) 10      (2) 1        (3) 4        (4) 2 Ans:  2

Explain about heterogeneous mixture, Q. Explain about heterogeneous mixture...

Q. Explain about heterogeneous mixture? A heterogeneous mixture is one that isn't blended smoothly throughout. Illustrations of heterogeneous mixtures include smoky air and m

Tests of benzaldehyde - aldehydes and ketones, Tests of benzaldehyde - alde...

Tests of benzaldehyde - aldehydes and ketones (a) It forms a white precipitate with   solution. (b)  It creates a yellow precipitate with 2: 4 dinitrophenyl hydrazines. (

Organic chemistry, explain diversity and magnitude of organic compounds?

explain diversity and magnitude of organic compounds?

Electrolytic reduction of magnesium chloride, Electrolytic reduction of mag...

Electrolytic reduction of magnesium chloride Iron cell 2. Magnesium 3. Graphite anode 4. Porcelain hood 5. Iron cathode 6. Coal gas 7. Chlorine 8. Coal gas 9. Molten ele

Chemistry, importance of chemistry in computer engineering

importance of chemistry in computer engineering

Surface chemistry, what are the different types of colloidal system?

what are the different types of colloidal system?

The following compound has electrovalent linkage, Which of the following co...

Which of the following compound has electrovalent linkage: (1)  CH 3 Cl                                                   (2)  Nacl             (3)  CH 4

Calculate the activity coefficient, Calculate the activity co-efficient? ...

Calculate the activity co-efficient? The solubility of gaseous O 2 at a partial pressure of 1.01 bar and a temperature of 310.2K, ex- pressed as a concentration, is 1.07 *10 -

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