Thermal expansion and solubility limits of cerium-doped lanthanum zirconates

A series of compositions with the general formula La2(Zr2−2xCe2x)O7 (0 ≤ x ≤ 0.75) were prepared by the coprecipitation–calcination method and characterized by powder XRD. The composition of prepared ceramic materials changed from single pyrochlore structure to the mixture with pyrochlore structure and fluorite structure as x increased. The lattice parameters decreased firstly and then increased while the amount of Ce4+ at 298 K was increased. The thermal expansion coefficient of La2Zr2O7 was improved by a number of Ce4+ adoptions at high temperature.

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► Ce-doped La2Zr2O7 was prepared by the coprecipitation–calcination method.
► In situ HT-XRD measurements revealed that is much stable than 8YSZ at high temperature.
► Its thermal expansion is better than 8YSZ.