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- W2000437817 abstract "Mixed ionic-electronic conducting pyrochlore structure oxides, with Pr and Gd on the A site and Zr, Mn, Ce, Sn, In, Mo. and Ti on the B site, were characterised by X-ray powder diffraction and Raman spectroscopy. Mn and In have a solubility around x = 0.1-0.2 in Pr 2 Zr 2-x Mn x O 7 and Pr 2 Sn 2-x In 3 O 7 , respectively. In the series Pr 2 M 2-x MO 7 , where M=Sn, Zr and M'=In. Ce, we observe dopant-O 6 symmetrical stretch vibrations in addition to the host lattice modes. A defect model of a B site doped pyrochlore is developed with Pr 3+ on the A site; Zr B 8 (Zr 4+ ), Ce ' B (Ce 3+ ), ), Ce B (Ce 4+ ) on the B site; O and V o on the O site, interstitial oxygens O i , and delocalised electrons and electron holes. Four mass action law expressions govern such a model. The defect model can rationalise why homo-valent doping, i.e. substitution of Zr(4+) by Ce(4+ ), can lead to an increase in ionic conductivity. The calculated Brouwer diagram for Pr 2 Zr 1.6 Ce 0 4 O 7-δ is shown. This composition has a transition from mixed ionic p-type to presumably pure ionic conduction around pO 2 = 10 7.5 atm. At pO 2 < 10 -1 atm the material gradually changes into the n-type regime. Typical magnitudes are finally given for the four equilibrium constants, leading to cases of pure p-type, p- to n-type and pure electrolytic behaviour of doped pyrochlores." @default.
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- W2000437817 date "2000-11-01" @default.
- W2000437817 modified "2023-09-23" @default.
- W2000437817 title "Structure, Raman spectra and defect chemistry modelling of conductive pyrochlore oxides" @default.
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- W2000437817 doi "https://doi.org/10.1016/s0167-2738(00)00417-3" @default.
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