[1] UNLP, CONICET, CIC, CETMIC Technol Ctr Mineral Resources & Ceram, Cno Centenario & 506, RA-1897 Buenos Aires, DF, Argentina
[2] Natl Univ La Plata UNLP, Fac Exact Sci, Dept Chem, RA-1900 La Plata, Buenos Aires, Argentina
[3] UNLP, CONICET, INIFTA Res Inst Theoret & Appl Phys Chem, CC 16,Suc 4, RA-1900 La Plata, Buenos Aires, Argentina