Investigations of barium and strontium dicarboxylates – new metaloorganic compounds

Abstract

sepiolite ideal composition for two of them, which origin was from two thick (>1m) high grade sepiolite layer in Vicálvaro and Barajas (Table). Specimens sampled from less developed sepiolite layers showed a slight excess in F, Si and lower Mg occupation than ideal sepiolite [4]. It is observed a correlation between the high fl uorine content and low magnesium occupation of the studied samples with the loss of ideal structure. Sample Corrected Formulae TS4 Si 12.02 (Mg 7.97)((OH) 3.14 F 0.86) S41733 Si 12.04 (Al 0.05 Mg 7.84)((OH) 3.35 F 0.65) S4284 Si 12.17 (Al 0.03 Mg 7.63)((OH) 2.80 F 1.20) S13392 Si 12.16 (Mg 7.68)((OH) 3.04 F 0.96) Ordering and degree of occupancy of Mg and F ions are being studied in order to explain the structural anomalies found in sepiolite.