Texture Development in YBa 2 Cu 30 , by Hot Extrusion and Hot - Pressing

case of 18 kN, a considerable portion of the particles are mechanically broken. The structure is condensed nearly without cavities. It might be useful to prepare pellets of high density, as the diffusion coefficient of tritium in Li,SiO, or Li4Si04 is on the order of 2 magnitudes higher than in the other lithium compounds.’ Li2Si03.nH20 is X-ray amorphous. ‘ A considerable portion of the powder has already been crystallized after powder calcination at 600°C. Material sintered at a temperature of 1100°C has crystallized completely (Fig. 2). CONCLUSIONS The preparation processes including the spray-dry technique’ can be recognized as an approved method for preparing fine powders of lithium metaand orthosilicate. In contrast to standard procedure^,^.^ an inherent source of chemical impurities has been excluded. With increasing compacting pressure from 10 kN, the particles were highly compressed, the cavities dissolve, and the structure becomes relatively homogeneous in the case of spray-dried lithium silicate powders.