Answer: BaTiO3.
- A Fe<sub>3</sub>O<sub>4</sub>
- B BaTiO3
- C NaCl
- D SiO<sub>2</sub>
Correct answer: B. BaTiO3
Explanation: BaTiO₃ (barium titanate) is a classic ferroelectric material; it has spontaneous electric polarisation that can be reversed by an applied electric field. Fe₃O₄ is ferrimagnetic.
The three cubic unit cells: Simple Cubic has atoms only at corners; Body-Centred adds one atom at the centre; Face-Centred adds one atom at the centre of each of the 6 faces, giving the highest packing efficiency.
Concept context
Explore the ordered world of crystalline solids: unit cells, packing, defects, and how structure determines electrical and magnetic properties.