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Density Measurements of Glasses in the Series x Na 2 S + (1 − x )B 2 S 3
Author(s) -
Martin Steve W.,
Polewik Tamara
Publication year - 1991
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1991.tb04133.x
Subject(s) - boron , alkali metal , analytical chemistry (journal) , crystallography , sulfide , chemistry , trigonal crystal system , tetrahedron , mineralogy , materials science , crystal structure , organic chemistry , chromatography
Measurements of the densities of glasses in the series x Na 2 S + (1 − x )B 2 S 3 are reported for the first time. As has been found in the corresponding oxyborate series x Na 2 O + (1 − x )B 2 O 3 , the addition of Na 2 S to B 2 S 3 causes the density to increase, from 1.80 g/mL for pure B 2 S 3 to 1.99 g/mL at the limit of the low‐alkali sulfide glass‐forming range of x = 0.25. These data provide evidence for the formation of tetrahedral boron units (BS 4 − ) as alkali is added. Volumes for the trigonal BS 3 and tetrahedral BS 4 − groups of 57.55 and 51.79 Å 3 , respectively, were determined. As has also been found in the oxyborates, the tetrahedral boron group occupies a smaller volume than the trigonal boron group and causes the increase in density with added Na 2 S.