The surface conductivity of gamma-irradiated ceramic dielectrics

Autor:	V. N. Sandalov, M. I. Muminov
Rok vydání:	2003
Předmět:	Crystal Surface conductivity Materials science Physics and Astronomy (miscellaneous) Electrical resistivity and conductivity visual_art Analytical chemistry visual_art.visual_art_medium Grain boundary Ceramic Dielectric Irradiation Polaron
Zdroj:	Technical Physics Letters. 29:687-690
ISSN:	1090-6533 1063-7850
DOI:	10.1134/1.1606789
Popis:	We have studied the surface dc conductivity of commercial alumina based ceramic dielectrics of the UF-46 and GB-7 types in a temperature interval from 200 to 400 K before and after gamma irradiation to a dose of 104–105 Gy. The two ceramics differ in the content of the α-Al2O3 crystal phase (72 wt % for UF-46 versus 86 wt % for GB-7) and in the total specific area of the grain boundaries (3.40 m2/kg for UF-46 versus 4.56 m2/kg for GB-7). In the temperature interval studied, the surface conductivity obeys a power law with the exponent dependent on the grain boundary area and the gamma radiation dose. Irradiation leads to a significant decrease in the exponent, the effect being more pronounced for ceramics with a greater grain boundary area. It is suggested that the electric conductivity proceeds according to a polaron mechanism, with a multiphoton character of the corresponding electron transitions.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::5741c8a88bdba4d444485b2f69043965 https://doi.org/10.1134/1.1606789 Zobrazit plný text záznamu Plný text ve formátu PDF