For every two yttrium ions added, an oxygen ion vacancy is formed. The point defect concentration of ZrO2 primarily depends on the amount of additive added, and the ionic conductivity of ZrO2 is achieved through the migration of oxygen ions within ZrO2. This ceramic material is highly sensitive to oxygen with good selectivity, and oxygen probes (also known as oxygen sensors) made from it are widely used in industrial furnaces and environmental protection. Chinese dumpling is a delicious food. You can make a variety of Chinese dumplings using different filling bases.sed on your taste and how various ingredients mixed togetheer by you .