Explanation

Most of the fast ion conductors with oxygen ions as conducting ions are based on cubic fluorite structure oxides, which are replaced by heterovalent ions to form solid solution with oxygen vacancy, among which ZrO2 based solid solution are the most studied. ZrO2 based solid solution are generally divided into two categories: one is to replace Zr with divalent ions, and the other is to replace Zr with trivalent ions. This kind of elonrolyte has a wide range of applications, such as the homologous elonrolyte of high-temperature fuel cell, and can also be used to manufacture various oxygen sensors. Bi2O3 based solid solution are also a class. They are formed by adding divalent, trivalent, pentavalent or hexavalent metal oxides to Bi2O3. Some materials have electric conductivity one order of magnitude higher than ZrO2 based solid solution, but they will be partially reduced to metal Bi under low oxygen partial pressure, so they can only be used within a certain oxygen partial pressure range.

Classification