Phosphorus and boron speciation in K 2 O-B 2 O 3 -SiO 2 -P 2 O 5 glasses

Details Phosphorus and boron speciation in K 2 O-B 2 O 3 -SiO 2 -P 2 O 5 glasses Phosphorus and boron speciation in K 2 O-B 2 O 3 -SiO 2 -P 2 O 5 glasses

Nov 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994gecoa..58.4633g&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 58, Issue 21, pp.4633-4647

Physics

3

Scientific paper

Raman, 11 B and 31 P MAS NMR spectra of yP 2 O 5 · (1 - y ) [(20 - x )% K 2 O · x % B 2 O 3 · 80% SiO 2 ] glasses ( y = 0 to 0.03 and x = 5 to 13) show that dimers (P 1 ) and chains (P 2 ) are the dominant structural units for phosphate species; six-member rings (3B and 3O) and SiOB(IV) bonds are the major bonding types for boron-bearing species. Some of the B(IV)'s in the silicate network may be in structural sites similar to danburite. The coordination of B is strongly controlled by P in the glasses. The relative proportion of B(IV) to total B decreases significantly after adding less than 3 mol% P 2 O 5 . Homogeneous equilibria are determined from the spectral data to generalize the observed structural changes for each group of glasses with a fixed K 2 O / B 2 O 3 ratio. The and (1983) model for B coordination is partially revised to meet the new data of B speciation derived from 11 B MAS NMR spectra.

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