Über die Synthese von Albiten bei Temperaturen von 250 bis 700° C

摘要: A glass of composition NaAlSi3O8 with small contents Fe has been crystallized in the presence water vapor under 1000 bars, at temperatures range 250 to 700° C for varying periods time. The synthetic crystals were investigated microscopically and by x-ray powder diffraction methods. Most are twinned according albite law, but other twins found too. Size form seem depend on temperature crystallization. optic axial angles (2V x ) albites being measurable universal stage 50 100 degrees. There seems exist a linear relation between 2ϑ131−2ϑ1¯31 values (used as an indicator degree ordering) 2V values. change lattice parameters from (D) (O) is suggested deviate slightly linearity. In contrast previous investigations steady value which characteristic crystallization was reached more rapidly. These results suggest that content had catalytic effect Al/Si ordering.