Consider the following statements regarding the electrical proper

Consider the following statements regarding the electrical properties of ceramic materials:

1. They are practically non-conductors at a lower temperature.

2. Ordinary glass and silicates in the molten state are dependable as electrical non-conductors.

3. They offer high resistance to the current transmission and get heated soon when conducting electric currents.

Which of the above statements are correct?

A. 1 and 2 only

B. 1 and 3 only

C. 2 and 3 only

D. 1, 2 and 3

Please scroll down to see the correct answer and solution guide.

Electrical properties of ceramic materials include:

Very high electrical resistance at a low temperature which results in low conductivity and it, therefore, behaves as an insulator i.e. non-conductor. (Statement 1 is Correct)
High dielectric constant
High dielectric strength
Low dielectric loss

Variation of ceramic materials with Temperature:

At low Temperature: Ceramic remains in solid form due to no band break and acts as an insulator and no current conduction is possible.

At High Temperature:

Weaker bonds of ceramic start breaking and due to this ceramic converted into solid to liquid (i.e. molten) state.
Because of this, some of the free movable ions are generated that can capable to conduct current, and due to current conduction it get heated soon.
So at high temperature, ceramic is in the molten state and behaves like an electrical conductor.

∴ Statement – 2 is incorrect and Statement 3 is correct.

Note: Some important ceramic materials are glass, silicates, zinc sulfide, yttrium garnet, Alumina, porcelain, etc.