In the context of metal oxides, it is less common for the dielectric constant to have a negative real part.

Most metal oxides, as dielectric materials, have positive real dielectric constants. These positive values indicate that these materials enhance the electric field and are commonly used in capacitors, insulators, and various electrical components...

Dear Priya Dhuria,

You may want to look over some helpful information presented below:

Yes, the real part of the dielectric constant (�′ε′) can be negative in certain cases. When this occurs, it signifies that the material is exhibiting what is known as a "negative permittivity" or "metamaterial" behavior.

Negative permittivity is a unique property found in specially engineered materials (metamaterials) that have been designed to have specific electromagnetic characteristics that are not typically found in natural materials. In these materials, the real part of the dielectric constant takes on a negative value at specific frequencies or under certain conditions.

When the real part of the dielectric constant is negative, it has several significant implications:

It's important to note that the phenomenon of negative permittivity is typically observed under specific conditions and at particular frequencies. Additionally, the development and application of metamaterials with negative permittivity is an active area of research and has led to numerous innovative applications in various fields of science and technology.