Solid State Question 78
Question: $ ZnO $ is white when cold and yellow when heated. It is due to the development of
Options:
A) Frenkel defect
B) Schottky defect
C) Metal excess defect
D) Metal deficiency defect
Show Answer
Answer:
Correct Answer: C
Solution:
[c] $ ZnO\xrightarrow{\Delta }Z{{n}^{2+}}+\frac{1}{2}O_2+2{{e}^{-}} $ The remaining $ Z{{n}^{2+}} $ ions occupy the interstitial voids of remaining crystal, thus causing metal excess defect.
BETA
