Thermal expansion and fracture toughness of (RE0.9Sc0.1)2Zr2O7 (RE=La, Sm, Dy, Er) ceramics
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Abstract
Abstract (RE 0.9 Sc 0.1 ) 2 Zr 2 O 7 and pure RE 2 Zr 2 O 7 (RE=La, Sm, Dy, Er) compounds were synthesized by a chemical-coprecipitation and calcination method, and their phase structure, thermal expansion behavior and fracture toughness were investigated. Compared with pure RE 2 Zr 2 O 7 , (La 0.9 Sc 0.1 ) 2 Zr 2 O 7 and (Sm 0.9 Sc 0.1 ) 2 Zr 2 O 7 exhibited larger lattice parameters mainly due to the presence of Sc 3+ interstitial ions, while (Dy 0.9 Sc 0.1 ) 2 Zr 2 O 7 and (Er 0.9 Sc 0.1 ) 2 Zr 2 O 7 had smaller lattice parameters, might attributable to the substitution of Sc 3+ for RE 3+ . With the addition of 10 mol% Sc 2 O 3 , the thermal expansion coefficients of La 2 Zr 2 O 7 and Sm 2 Zr 2 O 7 were obviously enhanced, while those of Dy 2 Zr 2 O 7 and Er 2 Zr 2 O 7 decreased, which was considered to have close relationship with the solid-solution mechanisms of Sc 2 O 3 in (RE 0.9 Sc 0.1 ) 2 Zr 2 O 7 . 10 mol% Sc 2 O 3 doping benefited the fracture toughness of (RE 0.9 Sc 0.1 ) 2 Zr 2 O 7 (RE=La, Sm, Dy, Er), which could be attributed to the increased cohesive energy due to the lattice distortion.
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Research context
OpenAlex topics: Nuclear materials and radiation effects · Nuclear Materials and Properties · Advanced ceramic materials synthesis
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