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Doped Gd 2 Zr 2 O 7  materials have interesting properties as thermal barrier coatings (TBC) to replace the YSZ topcoats traditionally used. Here we investigate the thermomechanical properties and phase relations of Gd 2 Zr 2 O 7  (GZO) alloyed with 5 mol% Yb 2 O 3  stabilized ZrO 2  (YbSZ) in the composition range (Gd 2 Zr 2 O 7 ) 1− x  (YbSZ)  x  , 0 ≤  x  ≤ 0.98. With increasing YbSZ content, phase transformations from ordered to disordered pyrochlore to fluorite and tetragonal structures were observed. The thermal expansion coefficient (TEC) and Vickers hardness were correlated showing a maximum hardness (~ 11.5 GPa) and minimum TEC at  x  = 0.82. At 1000 °C, the TEC for the end members,  x  = 0 and 0.98, were 11.4 and 11.3 × 10 –6  K −1 , respectively. The fracture toughness,  K  IC , showed an average value around 1.5 MPa m 0.5  for  x  ≤ 0.93 and increased significantly at  x  = 0.98 reaching 5.4 MPa m 0.5  due to the presence of a ferroelastic phase. For TBC applications, compounds with  x  = 0.98 show promise due to high TEC and high  K  IC . Graphic abstract Fig. 5a summarize the most important results in the manuscript. Showing a significant increase in fracture toughness for compositions with x=0.98.

Phase relations and thermomechanical properties of (Gd2Zr2O7)1−x(YbSZ)x based thermal barrier coatings (0 ≤ x ≤ 0.98)