Journal
CHEMISTRY OF MATERIALS
Volume 22, Issue 8, Pages 2510-2516Publisher
AMER CHEMICAL SOC
DOI: 10.1021/cm903132w
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Funding
- EPSRC [EP/C511794/1]
- EU
- Engineering and Physical Sciences Research Council [EP/C511794/1] Funding Source: researchfish
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The two-dimensional polyhedral anion network melilites La1+xSr1-xGa3O7+05x exhibit interstitial oxide ion conductivity. The solid solution is shown to extend to x = 0.64, and the variation of the conductivity with x is investigated At high temperatures, all of these compounds adopt the typical tetragonal melilite structure. When x > 0.6, cooling below 600 degrees C results in a reversible phase transition to an orthorhombic structure which reduces the ionic conductivity Quenching experiments have shown the tetragonal structure has a higher conductivity compared to the orthorhombic structure of the same composition Short-range order effects associated with this transition exercise an important influence on the composition- and temperature-dependence of the conductivity
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