Patterns of aggregation in coprecipitation reactions

M.A. Pérez, A.B. Cabrera, R. Silva, M.E. Mendoza, J.L. Carrillo


Prismatic polycrystalline magnetic particles of iron oxalate were grown by
allowing the aggregation of the precipitating crystallites that were
produced by a reaction between aqueous iron salts and oxalic acid solutions.
The experiments were done at room temperature and under different pH conditions.
The particle-growing process was followed by optical microscopy and was then
digitally recorded. The effect of the presence of a static magnetic field on
the coprecipitation process was also analyzed. It was found that both pH
and applied field, considerably influence the aggregation of the
crystallites. This is clearly shown in the mean size and surface quality of
the particles. It was observed that high pH values produce larger particles
and that the applied field yields particles with a smoother surface than those
obtained without the application of the field. The polycrystalline particles
grow with the formation of clusters whose spatial distribution can be
characterized by scaling relations. From this scaling behavior, some
information about the spatial correlations occurring during
precipitation can be obtained.


Magnetic materials; aggregation in crystal growth

Full Text:



  • There are currently no refbacks.

REVISTA MEXICANA DE FÍSICA, year 67, issue 1, January-February 2021. Bimonthly Journal published by Sociedad Mexicana de Física, A. C. Departamento de Física, 2º Piso, Facultad de Ciencias, Universidad Nacional Autónoma de México, Ciudad Universitaria, Alcaldía Coyacán, C.P. 04510 , Ciudad de México. Apartado Postal 70-348. Tel. (+52)55-5622-4946,, e-mail: Chief Editor: José Alejandro Ayala Mercado. INDAUTOR Certificate of Reserve: 04-2019-080216404400-203, ISSN: 2683-2224 (on line), 0035-001X (print), both granted by Instituto Nacional del Derecho de Autor. Responsible for the last update of this issue, Technical Staff of Sociedad Mexicana de Física, A. C., Fís. Efraín Garrido Román, 2º. Piso, Facultad de Ciencias, Universidad Nacional Autónoma de México, Ciudad Universitaria, Alcaldía Coyacán, C.P. 04510 , Ciudad de México. Date of last modification, January 4, 2021.

The responsibility of the materials published in Revista Mexicana de Física rests solely with their authors and their content does not necessarily reflect the criteria of the Editorial Committee or the Sociedad Mexicana de Física. The total or partial reproduction of the texts hereby published is authorized as long as the complete source and the electronic address of the publications are cited.

There is no fee for article processing, submission or publication.

Revista Mexicana de Física by Sociedad Mexicana de Física, A. C. is distributed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License