Influence of La2Mo2O9 on the sintering behavior and electrochemical properties of gadolinium-doped ceria

Gadolinium-doped ceria (known as CGO or GDC) is a good oxide-ion conductor which presents potential application for solid-state electrochemical devices. However, one of the main drawbacks of this material is the high sintering temperature required to obtain dense ceramic. In this paper, we report a new way to reduce densification temperature of CGO by adding x weight percent of La2Mo2O9 material (0≤ x≤10). This latter is also a good oxide-ion conductor at high temperature (>580 °C) which allows the preservation of the electrochemical properties of CGO as shown by impedance spectroscopy. The sintering behavior is then studied using dilatometric measurements and mechanism of densification is discussed.