THERMAL-BEHAVIOR OF THE BASIC CARBONATES OF LANTHANUM-EUROPIUM

The basic carbonates of lanthanum with 10%, 20%, 50% and 80% of europi um were prepared by precipitation from homogeneous solutions via the h ydrolysis of urea, without the addition of an auxiliary anion, at two different temperatures. Elemental analysis, complexometric methods, X- ray diffraction patterns, solid state IR absorption, thermogravimetry/ derivative thermogravimetry (TG/DTG) and differential thermal analysis (DTA) were used to characterise the compounds and study their thermal behaviour.