A study of the nonstoichiometry and electrical conductivity of gadolinium sesquioxide

The nonstoichiometric compositions of Gd 2O 3 and their electrical conductivities were studied in the temperature range of 700–1100°C under oxygen pressures from 2 × 10 −1 to 1 × 10 −5 atm. The x values in GdO 1.5 + x were varied between 0.0115 and 0.0008. The enthalpies of formation of the nonstoic...

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Bibliographic Details
Published in:The Journal of physics and chemistry of solids 1988, Vol.49 (7), p.835-839
Main Authors: Chul Hyun Yo, Cheol Woo Kim, Eun Seok Lee, Woong Bum Pyon, Jae Shi Choi
Format: Article
Language:English
Subjects:
activation energy
Condensed matter: structure, mechanical and thermal properties
defect
electrical conductivity
Exact sciences and technology
Nonstoichiometry
Other topics in nonelectronic transport properties of condensed matter
Physics
Transport properties of condensed matter (nonelectronic)
weight change
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Summary:The nonstoichiometric compositions of Gd 2O 3 and their electrical conductivities were studied in the temperature range of 700–1100°C under oxygen pressures from 2 × 10 −1 to 1 × 10 −5 atm. The x values in GdO 1.5 + x were varied between 0.0115 and 0.0008. The enthalpies of formation of the nonstoichiometric compositions were found to be 5.81-4.64 kcal mole −1 and the average activation energy for electrical conduction was found to be 1.56 eV. The oxygen pressure dependence of electrical conductivity of nonstoichiometric compositions followed 1/ n behavior and 1/ n values increased from 1 5.5 to 1 5.2 in the temperature range 700–1100°C. The formation of nonstoichiometric compositions and the electrical conductivity are due to trivalent metal vacancies.
ISSN:0022-3697
1879-2553
DOI:10.1016/0022-3697(88)90036-4