The coprecipitation of magnesium nickel oxalate dihydrates from mixed metal cation solutions was monitored by conductivity measurements. A series of coprecipitates was then prepared from 0.2 M solutions with Mg contents varying from 0.2 t o 0.9 total metal cation and their cornpositions and structures studied by chemical analysis, infra-red spectrophotometry, thermogravimetric analysis and detailed differential calorimetry. The coprecipitates with upto 20 percent Mg content were solid solutions with structures similar t o nickel oxalate dihydrate, the coprecipitates with 20 to 80 percent Mg content were probably mixed solid solutions while the coprecipitates with over 80 percent Mg content were solid solutions with structures similar t o magnesium oxalate dihydrate.The ionic equilibria in supersaturated magnesium nickel oxalate solutions were analysed and mechanisms are proposed for coprecipitations from solutions of different Mg/(Mg + Ni) ratios.
The coprecipitations of iiiagnesiuni (and barium) iron(I1) antl nickcl oxalatc tlihydratcs were studied froin excess magnesium and bariuin oxalate solutions. Nucleation rates were estimated froiii the induction periods for the coprecipitations. Thc nucleation rates in oxcess magnesiu~n oxalate solutions first decreased with increasing excess oxalato anion concentration to niini~nuni values and then increased with increasing riiagnesiri~ri cation concentration. At low to interinediate Mg/Fe(II) (antl Mg/Ni) ratios the main nuclei were YeOx (and NiOx); at interiiiediate Mg/Fe(II) (and Mg/Ni) ratios the iiiairi nuclei were probably MgOx-FeOx (antl MgOx-NiOx) inixtures and/or solid solutions of cor>ipositions MgaFel-,Ox (and Mg,Nil-,Ox); at high Mg/Fe(II) (and Mg/Ni) ratios the iiiain nuclei wei't: MgOx.The nuuleat.ioii ratt:s in excess bariutn oxalate solutiuns were siinilar to those for thc:prwipitation of bariuni oxalate from supersaturated equivalent solutions. The inain nuclei i n i i i o s t systems were &Ox.
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