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April 30, 2026
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Synthesis and characterization of the RE2A2O7 oxides with an ultrahigh-entropy sublattice occupied by rare-earth elements

Materials Letters. 2025. Vol. 379. Article 137668.
Trofimov E., Ahmad Ostovari Moghaddam, Litvinyuk K., Anandkumar M., Efimova M., Mikhailov D., Zaitseva O.

The possibility of fabricating novel high-entropy oxides (HEOs) with one ultrahigh-entropy sublattice consisting of 13 cations in RE2A2O7 (RE = [La, Sm, Nd, Gd, Dy, Yb, Y, Er, Eu, Tb, Ho, Lu, Tm], A = Zr, Hf, Ti, Sn, Ce or Pr) is demonstrated. All the samples exhibited a pure pyrochlore-type or defective fluorite crystalline structure with various degrees of cation disordering. Particularly, RE2Ti2O7 and RE2Sn2O7 exhibited a pure pyrochlore-type structure with high degree of ordering, while RE2Ce2O7 and RE2Pr2O7 demonstrated a single fluorite type HEO structure. The results pave the way to fabricate RE2A2O7 HEOs with an ultrahigh-entropy sublattice and potential application as the ceramic layer in thermal barrier coatings.

Research target: Materials Technologies
Language: English
Full text
DOI
Keywords: ceramicsкерамикаредкоземельные элементыRare-earth elementsHigh-entropy oxidesThermal barrier coatingsВысокоэнтропийный оксидТермобарьерные покрытия
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