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Article Dans Une Revue Chemistry of Materials Année : 2005

Development of New Oxygen Ion Conductors Based on Nd4GeO8 and Nd3GaO6

Résumé

New oxygen ion conductors have been prepared by substituting Ga3+ for Ge4+ in Nd4GeO8, Zn2+ and Mg2+ for Ga3+ in Nd3GaO6, and Ca2+ and Sr2+ for Nd3+ in Nd3GaO6. A combustion technique using ethylenediamine tetraacetic acid has been developed to synthesize these materials at ~900 C, leading to powders with spherical particles of about 100-200 nm. The green pellets obtained through the combustion-synthesized powders could be sintered to ~98% at 1250 C. It was found that Nd4Ge1-xGaxO8-x/2 are formed up to x = 0.10, Nd3Ga1-xMxO6-x/2 (M = Zn, Mg) up to x = 0.03, and Nd3(1-x)M'3xGaO6-3x/2 up to x = 0.03 and 0.015 for M' = Ca and Sr, respectively. These relatively small substitution rates induce a significant increase in oxygen ion conductivity (800C = 0.2 × 10-2 S cm-1 for Nd4Ge0.9Ga0.1O7.95; 800C = 0.5 × 10-2 and 0.4 × 10-2 S cm-1 for Nd3Ga0.97M0.03O5.985 with M = Zn and Mg, respectively, and 800C = 0.6 × 10-2 and 0.7 × 10-2 S cm-1 for Nd2.91Ca0.09GaO5.955 and Nd2.955Sr0.045GaO5.9775, respectively) with respect to pure Nd4GeO8 (800C = 2.8 × 10-4 S cm-1) and pure Nd3GaO6 (800C = 2.7 × 10-4 S cm-1).

Domaines

Matériaux

Dates et versions

hal-00017948 , version 1 (30-03-2006)

Identifiants

Citer

R.D. Purohit, A. Chesnaud, A. Lachgar, O. R. Joubert, Maria Teresa Caldes, et al.. Development of New Oxygen Ion Conductors Based on Nd4GeO8 and Nd3GaO6. Chemistry of Materials, 2005, 17, pp.4479. ⟨10.1021/cm050537h⟩. ⟨hal-00017948⟩
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