Abstract Refractory-oxide materials with low thermal conductivity and high thermal expansion coefficients (TECs) have been the object of thermal barrier coating materials’ exploration. For the majority of oxide ceramic, the… Click to show full abstract
Abstract Refractory-oxide materials with low thermal conductivity and high thermal expansion coefficients (TECs) have been the object of thermal barrier coating materials’ exploration. For the majority of oxide ceramic, the thermal conductivity obeys the Umklapp scattering mechanism. In this work, the glass-like thermal conductivity is observed in defect-fluorite Dy3(Nb1-xTix)O7-x/2 (x = 0, 0.14 and 0.28, respectively) ceramic. The one-eighth oxygen vacancies and the random occupancy of two cations in defect-fluorite Dy3NbO7 lattice are regarded as the “rattler”, and they strongly obstruct propagation of phonon, reducing the thermal conductivity close to the amorphous limit.
Journal Title: Ceramics International
Year Published: 2018
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