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The precipitation of iron (II) and nickel oxalates with alkaline‐earth metal oxalates: Induction periods, nucleation rates and mechanisms
Author(s) -
Packter A.,
Chauhan P.,
Omomo A.
Publication year - 1987
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.2170220308
Subject(s) - oxalate , barium , nucleation , magnesium , nickel , alkaline earth metal , precipitation , chemistry , inorganic chemistry , supersaturation , metal , nuclear chemistry , physics , organic chemistry , meteorology
The coprecipitations of magnesium (and barium) iron(II) and nickel oxalate dihydrates were studied from excess magnesium and barium oxalate solutions. Nucleation rates were estimated from the induction periods for the coprecipitations. The nucleation rates in excess magnesium oxalate solutions first decreased with increasing excess oxalate anion concentration to minimum values and then increased with increasing magnesium cation concentration. At low to intermediate Mg/Fe(II) (and Mg/Ni) ratios the main nuclei were FeOx (and NiOx); at intermediate Mg/Fe(II) (and Mg/Ni) ratios the main nuclei were probably MgOxFeOx (and MgOxNiOx) mixtures and/or solid solutions of compositions Mg α Fe 1α Ox (and Mg α Ni 1α Ox); at high Mg/Fe(II) (and Mg/Ni) ratios the main nuclei were MgOx. The nucleation rates in excess barium oxalate solutions were similar to those for the precipitation of barium oxalate from supersaturated equivalent solutions. The main nuclei in most systems were BaOx.