Difference between amorphous and crystalline solids

  

                    Difference between amorphous and crystalline solids

 

Si. No.	Amorphous Solids	Crystalline Solids
1.	In crystalline solids, the atoms or molecules are arranged in regular repeated pattern.	Amorphous solids are those which lack the regular arrangement of atoms or molecules.
2.	amorphous have long-range orders in their structures.	crystalline materials have short-range orders in their structure.
3.	Amorphous solids have wide range of melting point.	Crystalline solids have sharp melting point.
4.	Amorphous solids do not have definite geometrical shape.	Crystalline solids have definite geometrical shape.
5.	Amorphous solids are isotropic.	Crystalline solids are anisotropic.
6.	Example : Glass, silicon are examples of amorphous solids.	Example : Rock salts, quartz and metals are some examples of crystalline solids.

 

Differences between Intrinsic and Extrinsic semiconductors

 

Sl. No.	Intrinsic semiconductors	Extrinsic semiconductors
1.	Pure form of semiconductors are said to be intrinsic semiconductor.	Impurity doped semiconductors are said to be extrinsic semiconductor.
2.
3.	Electrical conductivity depends only on temperature	Electrical conductivity depends on both temperature and dopant concentration
4.	The number of free electrons is equal to the number of holes	The number of free electrons is not equal to number of holes
5.	Example : pure germanium, silicon.	Examples : Trivalent gallium or boron doped germanium (Ge) or Silicon (Si) and pentavalent arsenic or phosphorus doped germanium (Ge) or Silicon (Si).