Grain-boundary diffusion and solubility of helium in submicrocrystalline palladium / Zhiganov AN,Kupryazhkin AY // TECHNICAL PHYSICS. - 2005. - V. 50, l. 8. - P. 1026-1033.

ISSN/EISSN:

1063-7842 / 1090-6525

Type:

Article

Abstract:

The diffusion and solubility of helium in palladium with a submicrocrystalline structure are investigated by thermal desorption of helium from He-saturated specimens at temperatures T = 293-508 K and saturation pressures P = 0.1-35 MPa. As the saturation pressure rises, the effective diffusion coefficient increases, exhibits a plateau, and then decreases to its initial value. Along with the four plateaus discovered earlier, the solubility versus saturation pressure dependence in the range 25.5-35.0 MPa demonstrates a fifth plateau, where the solubility is as high as (3.0 +/- 0.4) x 10(17) cm(-3). It is shown that the helium diffuses along grain boundaries, at which clusters ( traps) consisting of eight to ten vacancies are localized, and dissolves in these clusters. The high value of C-eff in the fifth plateau is explained by pairwise merging of adjacent vacancy clusters. From the D-eff(P) dependences, the vacancy clusters concentration is estimated as C{*} = 2.32 +/- 10(16) cm(-3). Within the experimental error, this value coincides with that obtained from the solubility data. Calculations of the energy of helium-defect interaction in submicrocrystalline Pd that are made using the molecular dynamics method support the experimental results. (c) 2005 Pleiades Publishing, Inc.

Author keywords:

GASES

DOI:

10.1134/1.2014533

Web of Science ID:

ISI:000231127800010

Соавторы в МНС:

Другие поля

Поле	Значение
Publisher	MAIK NAUKA/INTERPERIODICA/SPRINGER
Address	233 SPRING ST, NEW YORK, NY 10013-1578 USA
Language	English
EISSN	1090-6525
Keywords-Plus	GASES
Research-Areas	Physics
Web-of-Science-Categories	Physics, Applied
Author-Email	kupr@dpt.ustu.ru
Number-of-Cited-References	14
Usage-Count-Last-180-days	2
Usage-Count-Since-2013	16
Journal-ISO	Tech. Phys.
Doc-Delivery-Number	954AZ