Abstract
(Nd 1− x Gd x ) 2(Ce 1− x Zr x ) 2O 7 (0 ≤ x ≤ 1.0) powders with an average particle size of 100 nm were synthesized with chemical-coprecipitation and calcination method, and were characterized by X-ray diffractometry and scanning electron microscopy. The sintering behaviour of (Nd 1− x Gd x ) 2(Ce 1− x Zr x ) 2O 7 powders was studied by pressureless sintering at 1600–1700 °C for 10 h in air. The relative densities of (Nd 1− x Gd x ) 2(Ce 1− x Zr x ) 2O 7 solid solutions increase with increasing the sintering temperature, and gradually decrease with increasing the content of neodymium and cerium at identical temperature levels. (Nd 1− x Gd x ) 2(Ce 1− x Zr x ) 2O 7 solid solutions have a single phase of defect fluorite-type structure among all the composition combinations studied. The lattice parameters of (Nd 1− x Gd x ) 2(Ce 1− x Zr x ) 2O 7 solid solutions agree well with the Vegard's rule.
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