Question

a group of scientists is conducting an investigation to study the conductivity of perovskite. at which temperature do they need to perform the experiments for perovskite to conduct electric current? select all that apply.
t > 1980°c
t = 1980°c
t < 1980°c

Explanation:

Step1: Analyze perovskite structure

Perovskite materials like \(CaTiO_3\) (based on the structure shown with \(Ca\), \(Ti\), and \(O\) atoms) are ionic compounds. Ionic compounds conduct electricity when ions are mobile.

Step2: Consider ion mobility and temperature

Ions in solids gain mobility when heated. At high temperatures (\(T> 1980^{\circ}C\)), the lattice vibrations are sufficient to allow ion movement (e.g., \(Ca^{2 +}\), \(O^{2 -}\) etc. can move to conduct electricity). At \(T = 1980^{\circ}C\), the material may be in a transition state (not clearly conductive or non - conductive in terms of ion mobility for a steady current). At \(T<1980^{\circ}C\), the ions are relatively fixed in the lattice (low lattice energy), so they cannot move freely to conduct electric current.

Answer:

\(T > 1980^{\circ}C\)