When NiO is heated with a small amount of Li₂O in air at 1200°C, a non–stoichiometric compound LixNi(1x)O is… · ABC26PH0521
Subject: Physical Chemistry · Chapter: Solid State Chemistry · Topic: Solid State – General · Exam: GATE 2005-2021 · Marks: 2 · Difficulty: Medium
When NiO is heated with a small amount of $\mathrm{Li}_2\mathrm{O}$ in air at $1200^{\circ}\mathrm{C}$, a non–stoichiometric compound $\mathrm{Li}_x\mathrm{Ni}_{(1x)}\mathrm{O}$ is formed. This compound is
(a)an n - type semiconductor containing only $\mathrm{Ni}^{+}$
(b)an n -type semiconductor containing $\mathrm{Ni}^{+}$ and $\mathrm{Ni}^{2+}$
(c)a p–type semiconductor containing $\mathrm{Ni}^{2+}$ and $\mathrm{Ni}^{3+}$
(d)a p–type semiconductor containing only $\mathrm{Ni}^{3+}$
Answer
Answer: C ✓ checked by 4AB · confidence high
Explanation
Li⁺ on Ni sites is compensated by Ni³⁺ holes — a p-type semiconductor containing Ni²⁺ and Ni³⁺ (c).