Size-dependent radiation tolerance in ion irradiated TiN/AlN nanolayer films

Interface effects on ion-irradiation tolerance properties are investigated in nanolayered TiN/AlN films with individual layer thickness varied from 5 nm to 50 nm, prepared by pulsed laser deposition. Evolution of the microstructure and hardness of the multilayer films are examined on the specimens before and after He ion-implantation to a fluence of 4 × 10 m at 50 keV. The suppression of amorphization in AlN layers and the reduction of radiation-induced softening are observed in all nanolayer films. A clear size-dependent radiation tolerance characteristic is observed in the nanolayer films, i.e., the samples with the optimum layer thickness from 10 nm to 20 nm show the best ion irradiation tolerance properties, and a critical layer thickness of more than 5 nm is necessary to prevent severe intermixing. This study suggests that both the interface characteristics and the critical length scale (layer thickness) contribute to the reduction of the radiation-induced damages in nitride-based ceramic materials. © 2013 Elsevier B.V. All rights reserved.

Initial nucleation study and new technique for sublimation growth of AlN on SiC substrate

Single crystal platelets of AlN were successfully grown on 6H-SiC(0001) by a novel technique designed to suppress SiC decomposition, promote two-dimensional growth, and eliminate cracking in the AlN. X-ray diffractometry and synchrotron white beam X-ray topography demonstrate that the final AlN single crystal is of high structural quality.

Feminismo nacionalista nunha nación patriarcal:análise da proposta e recepción crítica da obra de Queizán

Que implica o feminismo nacionalista en Galiza? Trátase dunha posición feminista que xorde desde dentro do nacionalismo? (E de ser así, de que tipo de nacionalismo?). Ou trátase máis ben dun proxecto nacionalista inserido dentro da corrente feminista? (E neste caso, de que tipo de feminismo?). O principal propósito deste artigo é abordar estes interrogantes, explorando como interactúan as identidades de xénero e as identidades nacionais no pensamento e obra de Queizán. Para iso, en primeiro lugar cómpre contextualizar o espazo que lle reserva o discurso nacional(ista) dominante a outros parámetros definitorios alén da nación, e en particular ao parámetro xénero. Tras analizar posteriormente a proposta de Queizán, a terceira sección propón someter a exame a recepción que esta proposta feminista tivo por parte da crítica política, intelectual e literaria nacionalista. Esta achega é clave para comprender a evolución das formulacións da autora, así como a súa posición actual no panorama político e cultural galego do presente.