Ion irradiation effects in nanocrystalline TiN coatings

Multimodal grain size distribution and high hardness in fine grained tungsten fabricated by spark plasma sintering

“…The atomic fraction of these sinks in conventionally crystalline materials is usually small, and it might be possible to hinder the accumulation of point defects by increasing the area of grain boundaries through decreasing the grain size by formation of fine, ultrafine or nanocrystalline materials [4][5][6].…”

Elaboration and behavior under extreme irradiation conditions of nano- and micro-structured TiC

“…Other highly refractory carbide [21] and nitride [22,23] ceramics have been studied over the past few years as possible alternatives to SiC, either in the form of thin coatings (diffusion barriers [24]) or as possible matrices in fiber-reinforced composites [18]. Titanium carbide (TiC) is among the candidate materials because of its typical ceramic properties (very high melting point and hardness [5]), but also because of its good thermal conductivity.…”

“…Some other studies observed a potential gain in terms of resistance to irradiation of non-oxide ceramics due to submicron or nanometric grains [23,34]. This specific behavior of nanostructured ceramics is linked to the high density of grain boundaries (GBs) which favor the evacuation of some structural defects during irradiation [35].…”

Modification of the properties of TiN thin structures onsilicon substrate by ion bombardement

“…Kasnija istraživanja su ispitivala narušavanje strukture TiN slojeva različitim vrstama jona, različite energije i doze. Uočeno je da jonska implantacija kod TiN slojeva indukuje efekte kao što su promene u parametru rešetke [29], amorfizaciji [30], promene u stehiometriji [31], veličini zrna [32], što utiče na fizička i hemijska svojstva sloja. Urađena su brojna eksperimentalna istraživanja na tankim slojevima TiN koji su modifikovani jonskom implantacijom [33][34][35][36][37].…”

“…Reflektanca se izračunavala kao odnos intenziteta snopa reflektovanog sa uzorka i intenziteta snopa reflektovanog sa ogledala zlata. Na opadanje vrednosti veličine zrna može uticati efekat difuzije defekata ka granicama zrna, mehanizma koji je odgovoran za formiranje manjih kristalnih zrna [32,87]. Može se reći da interakcija površina i granica nanokristala u celini dovodi do lokalnog minimuma unutrašnje slobodne energije sistema u odnosu na zapreminu nanokristala.…”