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Characterization of Calcium Lanthanum Oxalate Powders Coprecipitated from Different Binary Solvent Mixtures
Author(s) -
Shen AnnTinn,
Lee YingSheng,
Sungyu NanKuen
Publication year - 1993
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1993.tb03927.x
Subject(s) - coprecipitation , lanthanum , precipitation , agglomerate , oxalic acid , particle size , solvent , inorganic chemistry , particle (ecology) , chemistry , oxalate , surface energy , chemical engineering , mineralogy , materials science , organic chemistry , physics , oceanography , meteorology , engineering , geology
White amorphous powders of well‐mixed calcium and lanthanum oxalates were prepared by coprecipitation of calcium and lanthanum nitrates with 1 M oxalic acid. SEM observation showed particle shapes of cubes, flakes, and agglomerates when water‐organic solvent mixtures were employed as the precipitation media. The measured specific surface area and the median particle diameter ( D 50 ) ranged between 1.5–76 m 2 /g and 0.9–14 μm, respectively, as a result of the divergent particle morphology. The morphology changes were attributed to a change of precipitation rate in different solvent mixtures. An attempt was made to explain the rate changes by the solvation energy change of ions which resulted in interfacial energy change within the depositing surface region.