Heterobimetallic Ba–Co aminopolycarboxylate complexes as precursors for BaCoO3-δ oxides; towards a one-stage-deposition of cobaltite films

The use of mixed-metal single source precursors for the synthesis of complex metal oxides

“…Higher organic content in precursors allows for greater porosity and smaller particle sizes in their decomposition products, attributed to greater gas escape during thermolysis. 55,56,60 Care should be taken in choosing the maximum heating temperature during annealing, as volatile metal compounds (e.g. Li2O or PbO) can also be lost, negating the carefully constructed intermetal ratio in the SSP.…”

Aminopolycarboxylate Bismuth(III)-Based Heterometallic Compounds as Single-Source Molecular Precursors for Bi4V2O11and Bi2CuO4Mixed Oxides

“…Generally, heating time and temperature have been the most frequently tested factors. Occasionally, the ligand nature 25,45 or the gaseous atmosphere 25 have been also probed. However, according to our recent findings the final product composition is strongly dependent upon the heating rate.…”

“…A similar situation was observed in the previously reported Ba-Co-APC precursors. 25 Among the analyzed complexes, only the samples containing ~31-32 % carbon produced the desired singlephase 2H-BaCoO 3-δ . (Table 5).…”

“…This flexible synthetic pathway has proven efficient in the preparation of BaCo II(III) (APC) molecular precursors. 25 Considering this, we have synthesized five coordination compounds of general formula M(L) y {Bi(APC)} 2 nH 2 O (M = VO 2+ , Cu 2+ ; APC = edta 4-or cdta 4-; L = 2,2'-bipyridine; y = 0, 1 or 2; n = 5-16) and used them as single-source molecular precursors for Bi 4 V 2 O 11 and Bi 2 CuO 4 heterometallic oxides. The decomposition behaviour of the precursors has been studied by combined TG/DTA.…”

“…Moreover, changing the organic matrix in the starting compounds can result in different morphological properties of the final oxide materials regarding the particle's shape and size, specific surface area and porosity. 24 Our previous work on the Ba-Co-containing system 25 demonstrated that, among the molecular precursors with the same Ba:Co ratio and similar APC ligands (nta 3-= nitrilotriacetate, edta 4-= ethylenediaminetetraacetate, cdta 4-= 1,2-cyclohexanediaminetetraacetate, dtpa 5-= diethylenetriaminepentaacetate), only the cdta 4--containing complexes led to pure 2H-BaCoO 3-δ upon thermal treatment at 650ºC. In this context we have expanded our studies to the formation of Bi 4 V 2 O 11 and Bi 2 CuO 4 mixed oxides by thermolysis of appropriate molecular precursors based on different APC ligands.…”