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|Title:||Oxide ion transport in (Nd2−xZrx)Zr2O7+δ electrolytes by an interstitial mechanism|
|Citation:||Shlyakhtina, A. V., Belov, D. A., Knotko, A. V., Avdeev, M., Kolbanev, I. V., Vorobieva, G. A., Karyagina, O. K., & Shcherbakova, L. G. (2014). Oxide ion transport in (Nd2−xZrx)Zr2O7+δ electrolytes by an interstitial mechanism. Journal of Alloys and Compounds, 603(0), 274-281. doi:10.1016/j.jallcom.2014.03.068|
|Abstract:||We have studied the structure and transport properties of ten (Nd2−xZrx)Zr2O7+x/2 (x = 0–1.27) solid solutions, which lie in the ZrO2–Nd2Zr2O7 isomorphous miscibility range. Major attention has been focused on the pyrochlore-like (Nd2−xZrx)Zr2O7+x/2 solid solutions with x = 0–0.78, which are thought to be potential interstitial oxide ion conductors. The X-ray and neutron diffraction results demonstrate that the (Nd2−xZrx)Zr2O7+x/2 (x = 0–1.27) solid solutions undergo an order–disorder (pyrochlore–defect fluorite) structural phase transition. The (Nd2−xZrx)Zr2O7+x/2 (x = 0.2–0.78) have the bulk conductivity, ∼(1.2–4) × 10–3 S/cm at 750 °C, which is two orders of magnitude higher than that of the ordered pyrochlore Nd2Zr2O7. An attempt has been made to determine the interstitial oxygen content of (Nd2−xZrx)Zr2O7+x/2 (x = 0.2; 0.67) in a reducing atmosphere using thermogravimetry and mass spectrometry. It has been shown that no reduction occurs in the NdZrO system, where neodymium has only one oxidation state, 3+. © 2014, Elsevier B.V.|
|Gov't Doc #:||7441|
|Appears in Collections:||Journal Articles|
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