UNSPECIFIED (1996) Structural and electrical characterisation of Er2-xPrxTi2O7 (0<x<0.4) pyrochlores. EUROPEAN JOURNAL OF SOLID STATE AND INORGANIC CHEMISTRY, 33 (7). pp. 659-671. ISSN 0992-4361

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Abstract

In this paper we show for the first time the preparation of free flowing spherical Er2-xPrxTi2O7 (0<x<0.4) particles prepared via a low temperature inorganic sol-gel route. The gel spheres were amorphous at room temperature, but calcining at 850 degrees C produced single phase material with the pyrochlore structure. Materials were characterised using scanning electron microscopy, X-ray diffraction, simultaneous differential thermal and thermogravimetric analysis and by impedance spectroscopy. SEM results indicated that the gel spheres had diameters between 30 mu m and 85 mu m. Arrhenius plots of the conductivity data showed that Er2Ti2O7 could be described by a single activation energy of 124 kJ/mol. Doping with praseodymium (x=0.4) reduced the activation energy to 100 kJ/mol (above 890 K) and increased the conductivity.

Item Type:	Journal Article
Subjects:	Q Science > QD Chemistry
Journal or Publication Title:	EUROPEAN JOURNAL OF SOLID STATE AND INORGANIC CHEMISTRY
Publisher:	GAUTHIER-VILLARS
ISSN:	0992-4361
Date:	1996
Volume:	33
Number:	7
Number of Pages:	13
Page Range:	pp. 659-671
Publication Status:	Published
URI:	http://wrap.warwick.ac.uk/id/eprint/18568

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