Reducing the thermal conductivity of La 2 Mo 2 O 9 with a trivalent praseodymium substitution for its potential use as a thermal barrier coating - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Dalton Transactions Année : 2019

Reducing the thermal conductivity of La 2 Mo 2 O 9 with a trivalent praseodymium substitution for its potential use as a thermal barrier coating

Résumé

La1−xPrx)2Mo2O9 powders were synthesized by solid state reaction for x = 0.00, 0.10, 0.25, 0.50, 0.75 and 1.00. Dense pellets were obtained by conventional sintering in air. Their thermal stability and thermal conductivity were measured from 100 to 700 °C and their cell parameters refined from X-ray powder diffraction pattern by the Rietveld method. A 50 mol% isovalent substitution of lanthanum in La2Mo2O9 by praseodymium stabilizes the high temperature β phase while reducing the thermal conductivity of the parent compound by 11–18%. For a praseodymium content x higher than 0.75, the thermal conductivity increases and a phase transition similar to that of La2Mo2O9 is observed except that the room temperature phase appears to be this time triclinic in symmetry.
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Dates et versions

hal-02154780 , version 1 (13-06-2019)

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Etienne Sabarthes, Fabian Delorme, Vladyslav Tezyk, Cecile Autret, Gwenaël Corbel, et al.. Reducing the thermal conductivity of La 2 Mo 2 O 9 with a trivalent praseodymium substitution for its potential use as a thermal barrier coating. Dalton Transactions, 2019, 48 (27), pp.10051-10061. ⟨10.1039/C9DT01192G⟩. ⟨hal-02154780⟩
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