Single-phase rare-earth high-entropy zirconates with superior thermal and mechanical properties

Influence of composition on structural evolution of high‐entropy zirconates—cationic radius ratio and atomic size difference

“…Additionally, two of the three reported materials by Zhao et al were also examined by other working groups and obtained as single-phase materials. 15,47,49,51 In 2022, Han et 4 because +2-cations could not be incorporated in the HEO lattice, and a reduction of the amount of O-vacancies occurred in these cases as explained earlier. However, considering only the three incorporated A-cations Y, Gd and Dy, δ is only 1.73%, and therefore, a single-phase material is predictable according to the stated rule (Table 1).…”

“…For instance, in 2020, Ren et with a thermal conductivity of 1.003 W m −1 K −1 . 15 Both show much lower thermal conductivities than the most common TBC material, yttria-stabilized zirconia (2.12 W m −1 K −1 ). 31 However, so far there is a lack of knowledge on correlations of composition and structure of these materials.…”

“…reported the synthesis of (Sm 0.2 Eu 0.2 Tb 0.2 Dy 0,2 Lu 0.2 ) 2 Zr 2 O 7 with a thermal conductivity of 0.86 W m −1 K −1 ,30 and very recently, in 2022, Luo et al. successfully synthesized (Nd 0.2 Sm 0.2 Eu 0.2 Gd 0,2 Yb 0.2 ) 2 Zr 2 O 7 with a thermal conductivity of 1.003 W m −1 K −1 15 . Both show much lower thermal conductivities than the most common TBC material, yttria‐stabilized zirconia (2.12 W m −1 K −1 ) 31 .…”

“…Therefore, HEOs are currently examined in a variety of research fields like (electro) catalysis, energy storage, electrode materials, and thermal barrier coatings (TBCs). [9][10][11][12][13][14][15][16][17][18] For TBCs, stability at high temperatures is one prerequisite for the materials used. Due to their high melting points, high-temperature phase stabilities, and low thermal conductivities, pyrochlore-type rare-earth zirconates with a general formula of A 2 Zr 2 O 7 have been extensively studied as a future TBC material.…”

High-Entropy Layered Rare Earth Hydroxides

“…In recent years, much attention has been paid to high-entropy RE-containing mixed oxides such as perovskites, , tantalites, tantalates, , niobates, , silicates, zirconates, − molybdates, and aluminates , due to their high potential as advanced ceramic materials possessing improved mechanical, thermal, and electrical properties . Cerium-based RE oxides with a fluorite structure have attracted researchers’ interest − since their semiconducting property can easily be tuned by chemical composition .…”