Table 1. Metal salts used for the SAS precipitations and the physical properties of the resultant perovskites.
Sample | B metal salt | Precursor solution La : B molar ratio | Precipitated La : B molar ratio a | Phase composition from XRD | Crystallite size (nm) | Surface area (g m–2) |
LaCrO3 | Chromium(iii) acetate b | 1 : 1 | 1 : 1.06 | LaCrO3, trace La2CrO6 c | 6 | 52 |
LaMnO3 | Manganese(ii) acetate tetrahydrate | 1 : 1.2 | 1 : 1.03 | LaMnO3 (100%) | 18 | 32 |
LaFeO3 | Iron(ii) acetate | 1 : 1.4 | 1 : 0.99 | LaFeO3 (85%), La2O3 (9%), Fe2O3 (6%) | 21 | 26 |
LaCoO3 | Cobalt(ii) acetate tetrahydrate | 1 : 1.1 | 1 : 1.05 | LaCoO3 (90%), Co3O4 (10%) | 22 | 22 |
LaNiO3 | Nickel(ii) acetate tetrahydrate | 1 : 1.1 | 1 : 1.07 | LaNiO3 (90%), La2O3 (8%), NiO (2%) | 15 | 36 |
aRatios calculated by MPAES.
bChromium acetate prepared in house from potassium chromate and sodium acetate.
cPhase composition of La2CrO6 could not be quantified.