title: Structural role of Fe in the soil active glasses.
abstract: Glasses of the SiO(2)-P(2)O(5)-K(2)O-MgO-CaO-Fe(2)O(3) system acting as slow release fertilizers were synthesized by the melt-quenching technique. The influence of iron addition on the structure of glasses was evaluated by FTIR spectroscopy (with spectra decomposition) and (57)Fe Mössbauer spectroscopy. The chemical activity of glasses in the 2 mass% citric acid solutions was measured by the ICP-AES method. It has been found that the formation of domains with structure similar to phosphates with chemically stable P-O-Fe(3+) and P-O-Fe(2+) bonds decreases the glass solubility under conditions simulating the soil environment.
authors.affiliation: AGH University of Science and Technology, Faculty of Materials Science and Ceramics, Mickiewicza 30, 30-059 Krakow, Poland.
authors.forename: I
authors.initials: I
authors.lastname: Wacławska
authors.forename: M
authors.initials: M
authors.lastname: Szumera
authors.forename: P
authors.initials: P
authors.lastname: Stoch
authors.forename: M
authors.initials: M
authors.lastname: Sitarz
mesh_terms: D000042:Absorption; D005898:Glass / Q000737:chemistry*; D007501:Iron / Q000737:chemistry*; D010710:Phosphates / Q000737:chemistry; D017640:Silicates / Q000737:chemistry; D012987:Soil / Q000737:chemistry*; D012995:Solubility; D012996:Solutions; D017550:Spectroscopy, Fourier Transform Infrared; D015204:Spectroscopy, Mossbauer
chemical_list: D010710:Phosphates; D017640:Silicates; D012987:Soil; D012996:Solutions; D007501:Iron