The antiferro electric solid among these is:

Options

A. `KH_(2)PO_(4)`
B. `MnO_(2)`
C. `BaTiO_(3)`
D. `PbZrO_(3)`

Answer

To determine the antiferroelectric solid among the given options, we need to understand the characteristics of antiferroelectric materials.

### Step-by-Step Solution:

1. **Definition of Antiferroelectric Materials**:
Antiferroelectric materials are characterized by an ordered array of electric dipoles. In these materials, the dipoles are arranged in such a way that adjacent dipoles have opposite orientations.

2. **Understanding Dipole Orientation**:
In antiferroelectric materials, the dipoles are oriented in an antiparallel manner. This means that if one dipole points in one direction, the adjacent dipole points in the opposite direction. This arrangement leads to a cancellation of the overall polarization in the absence of an external electric field.

3. **Identifying the Antiferroelectric Solid**:
To identify which solid among the options is antiferroelectric, we need to look for a material that exhibits the described dipole arrangement.

4. **Analyzing the Options**:
Based on the information provided in the video transcript, the correct antiferroelectric solid is mentioned as "PBZRO3" (Lead Barium Zirconate).

5. **Conclusion**:
Therefore, the antiferroelectric solid among the options given is **Option 4: PBZRO3**.