Materials and Components
On the basis of the type of chemical bonds, solids may be classified into

Ionic and valence crystals
Ionic crystals
Ionic crystal, valence crystals and metals
Ionic crystals, valence crystals, metal and vander wall crystals

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Materials and Components
When a material is in superconducting state and a magnetic field is applied

The superconducting property is not affected
The material may become an insulator
The superconducting property may be affected and resistivity may increase from zero to a low value
The superconducting property may be destroyed

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