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Potassium phosphate glasses used as agro-fertilizers with controlled solubility

B. A. SAVA1, L. BOROICA1,* , M. SAVA2, M. ELISA3, C. I. VASILIU3, F. NASTASE4, C. NASTASE4, R. MEDIANU1

Affiliation

  1. National Institute of Lasers, Plasma and Radiation Physics, 409 Atomistilor Str., MG-36, 077125, Magurele, Romania
  2. University of Agronomic Science and Veterinary Medicine of Bucharest, 59 Marasti Bvd, Bucharest, Romania
  3. National Institute of Research and Development for Optoelectronics INOE 2000, 409 Atomistilor Str., MG-5, 077125, Magurele, Romania
  4. University of Bucharest, Physics Department Polymer Science Group, PO Box MG 40, 077125, Magurele, Romania

Abstract

Two series of potassium phosphate glasses have been prepared, AG2 compositions containing P2O5, K2O, MgO with B2O3, Fe2O3, ZnO, MoO3 and AG3 compositions containing P2O5, K2O, MgO, CaO with B2O3, Fe2O3, ZnO, MoO3, MnO2. The glasses have been prepared by a conventional route: (i) preparation of raw materials; (ii) melting and refining; (iii) fritting; (iv) grinding of the glass; (v) screening of glass powder. Both for AG2 and AG3 glasses, FTIR spectra recorded in the 400-4000 cm-1 range, revealed optical phonons specific for the phosphate matrix. In the case of AG2.1 and AG3.1 glasses containing B2O3, FTIR spectra put in evidence optical phonons specific for B-O bond from BO3 and BO4 units. Raman spectra, recorded in the 100-4000 cm-1, by 785 nm laser excitation show stretching vibration modes specific for phosphate matrix together with Mg-O vibration mode in the 320-336 cm-1 range. Information about vitreous fertilizers solubility was achieved by conduct-metric method. For AG2 series, minimum solubility was measured for the sample containing iron oxide and maximum solubility for base sample. From AG3 series, the sample containing iron oxide also showed minimum solubility, but the maximum solubility appeared for the sample with molybdenum oxide..

Keywords

Potassium phosphate glass, Fertilizers, Solubility, FTIR, Raman.

Submitted at: June 6, 2011
Accepted at: Nov. 23, 2011

Citation

B. A. SAVA, L. BOROICA, M. SAVA, M. ELISA, C. I. VASILIU, F. NASTASE, C. NASTASE, R. MEDIANU, Potassium phosphate glasses used as agro-fertilizers with controlled solubility, Journal of Optoelectronics and Advanced Materials Vol. 13, Iss. 11-12, pp. 1534-1541 (2011)