Abstract
The two-dimensional polyhedral anion network melilites La1+xSr1-xGa3O7+0.5x exhibit interstitial oxide ion cond. The solid soln. is shown to extend to x = 0.64, and the variation of the cond. with x is investigated. At high temps., all of these compds. adopt the typical tetragonal melilite structure. When x > 0.6, cooling below 600° results in a reversible phase transition to an orthorhombic structure which reduces the ionic cond. Quenching expts. have shown the tetragonal structure has a higher cond. compared to the orthorhombic structure of the same compn. Short-range order effects assocd. with this transition exercise an important influence on the compn.- and temp.-dependence of the cond. [on SciFinder(R)]
Original language | English |
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Pages (from-to) | 2510-2516 |
Number of pages | 7 |
Journal | Chemistry of Materials |
Volume | 22 |
Issue number | 8 |
DOIs | |
Publication status | Published - 30 Mar 2010 |
MoE publication type | A1 Journal article-refereed |
Keywords
- lanthanum strontium gallate ceramic compn ionic cond