A TEM study of grain boundaries in internal boundary layer capacitors based on donor-doped (Sr, Ca) TiO3 ceramics

International audienceDonor-doped (Sr, Ca)TiO3 ceramics, either oxidized or infiltrated by Bi2O3 and Bi2O3-PbO molten mixtures, have been studied using a transmission electron microscope equipped with EDX facilities. Grain boundary morphologies of these different materials are investigated. In oxidized samples, grain surfaces exhibit a chemical contrast, interpreted as the result of a TiO2 segregation that occurs during the sintering stage. Moreover, the in-detail characterization of infiltrated specimens reveals that intergranular regions present a facies strongly influenced by the type of mixture used. During the infiltration step, grains are slightly dissolved by molten oxides and Pb noticeably enhances this process

Mise a l'herbe precoce des veaux laitiers nes a l'automne.

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Production, qualite et valeur alimentaire du colza fourrager utilise l'automne ou au printemps.

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Importance of the abomasum in digestion in the preruminant calf

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Importance of the abomasum in digestion in the preruminant calf

Ice Storm 1998 damage survey for the Maine Forest Service Film roll Ice 1 Ice Storm Index A5857 14Chttps://digitalcommons.library.umaine.edu/sewell_aerial_all/1952/thumbnail.jp