Helium Defectoscopy of Cerium Gadolinium Ceramics Ce0.8Gd0.2O1.9 with a Submicrocrystalline Structure in the Impurity Disorder Region / Koromyslov A. V.,Zhiganov A. N.,Kovalenko M. A.,Kupryazhkin A. Ya. // PHYSICS OF THE SOLID STATE. - 2013. - V. 55, l. 12. - P. 2537-2542.

ISSN/EISSN:
1063-7834 / 1090-6460
Type:
Article
Abstract:
The concentration of impurity anion vacancies formed upon the dissociation of gadolinium-vacancy complexes has been determined using helium defectoscopy of the cerium gadolinium ceramics Ce0.8Gd0.2O1.9 with a submicrocrystalline structure in the temperature range T = 740-1123 K and at saturation pressures ranging from 0.05 to 15 MPa. It has been found that the energy of dissociation of gadolinium-vacancy complexes is E-eff(D) = 0.26 +/- 0.06 eV, and the energy of dissolution of helium in anion vacancies in the impurity disorder region is E-P = -0.31 +/- 0.09 eV. The proposed mechanism of dissolution has been confirmed by the investigation of the electrical conductivity of the cerium gadolinium ceramics, as well as by the high-speed molecular dynamics simulation of the dissociation of gadolinium-vacancy complexes. It has been assumed that a decrease in the effective dissolution energy in comparison with the results of the previously performed low-temperature investigations is caused by the mutual repulsion of vacancies formed upon the dissociation of gadolinium-vacancy complexes in highly concentrated solutions of gadolinium in CeO2 with increasing temperature.
Author keywords:
нет данных
DOI:
10.1134/S1063783413120159
Web of Science ID:
ISI:000328326000020
Соавторы в МНС:
Другие поля
Поле Значение
Month DEC
Publisher MAIK NAUKA/INTERPERIODICA/SPRINGER
Address 233 SPRING ST, NEW YORK, NY 10013-1578 USA
Language English
EISSN 1090-6460
Research-Areas Physics
Web-of-Science-Categories Physics, Condensed Matter
Author-Email a.v.koromyslov@gmail.com
Number-of-Cited-References 9
Usage-Count-Last-180-days 6
Usage-Count-Since-2013 44
Journal-ISO Phys. Solid State
Doc-Delivery-Number 270NS