<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0035-001X</journal-id>
<journal-title><![CDATA[Revista mexicana de física]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. mex. fis.]]></abbrev-journal-title>
<issn>0035-001X</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Mexicana de Física]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0035-001X2009000200003</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Patterns of aggregation in coprecipitation reactions]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pérez]]></surname>
<given-names><![CDATA[M.A.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cabrera]]></surname>
<given-names><![CDATA[A.B.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Silva]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Mendoza]]></surname>
<given-names><![CDATA[M.E.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Carrillo]]></surname>
<given-names><![CDATA[J.L.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad Autónoma de Puebla Instituto de Física ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>04</month>
<year>2009</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>04</month>
<year>2009</year>
</pub-date>
<volume>55</volume>
<numero>2</numero>
<fpage>90</fpage>
<lpage>96</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0035-001X2009000200003&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0035-001X2009000200003&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0035-001X2009000200003&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[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 óptical 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.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Se crecieron partículas magnéticas prismáticas policristalinas de oxalato de hierro permitiendo la agregación de cristalitos precipitados que fueron producidos por una reacción entre soluciónes acuosas de sales de hierro y ácido oxálico. Los experimentos se realizaron a temperatura ambiénte y bajo diferentes condiciones de pH. El proceso de crecimiento de las partículas fue seguido por microscopia óptica y digitalmente grabado. El efecto de la presencia de un campo magnético estático en el proceso de agregación también fue analizado. Se encontró que ambos, el pH y el campo magnético, influyen considerablemente en la agregación de los cristalitos. Esto se muestra claramente en el tamaño medio y la lisura de la superficie de los cristalitos. Se observó que para altos valores de pH se producen partículas mayores y que el campo magnético aplicado produce partículas con superficie mas lisa que aquellas crecidas sin la aplicación del campo. Las partículas policristalinas crecen con la formación de clusters cuya distribución espacial puede ser caracterizada bajo relaciones de escalamiento. Del comportamiento de este escalamiento es posible obtener alguna información sobre las correlaciones espaciales que ocurren durante la coprecipitación.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Magnetic materials]]></kwd>
<kwd lng="en"><![CDATA[aggregation in crystal growth]]></kwd>
<kwd lng="es"><![CDATA[Materiales magnéticos]]></kwd>
<kwd lng="es"><![CDATA[agregación en el crecimiento cristalino]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="justify"><font face="verdana" size="4">Investigaci&oacute;n</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="4"><b>Patterns of aggregation in coprecipitation reactions</b></font></p>     <p align="center"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="2"><b>M.A. P&eacute;rez, A.B. Cabrera, R. Silva, M.E. Mendoza, and J.L. Carrillo</b></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><i>Instituto de F&iacute;sica, Universidad Aut&oacute;noma de Puebla, Apartado Postal J&#150;48, Puebla 72570, M&eacute;xico.</i></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2">Recibido el 31 de marzo de 2008    <br> Aceptado el 24 de marzo de 2009</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Abstract</b></font></p>     <p align="justify"><font face="verdana" size="2">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&#150;growing process was followed by &oacute;ptical 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.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Keywords:</b> Magnetic materials; aggregation in crystal growth.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Resumen</b></font></p>     <p align="justify"><font face="verdana" size="2">Se crecieron part&iacute;culas magn&eacute;ticas prism&aacute;ticas policristalinas de oxalato de hierro permitiendo la agregaci&oacute;n de cristalitos precipitados que fueron producidos por una reacci&oacute;n entre soluci&oacute;nes acuosas de sales de hierro y &aacute;cido ox&aacute;lico. Los experimentos se realizaron a temperatura ambi&eacute;nte y bajo diferentes condiciones de pH. El proceso de crecimiento de las part&iacute;culas fue seguido por microscopia &oacute;ptica y digitalmente grabado. El efecto de la presencia de un campo magn&eacute;tico est&aacute;tico en el proceso de agregaci&oacute;n tambi&eacute;n fue analizado. Se encontr&oacute; que ambos, el pH y el campo magn&eacute;tico, influyen considerablemente en la agregaci&oacute;n de los cristalitos. Esto se muestra claramente en el tama&ntilde;o medio y la lisura de la superficie de los cristalitos. Se observ&oacute; que para altos valores de pH se producen part&iacute;culas mayores y que el campo magn&eacute;tico aplicado produce part&iacute;culas con superficie mas lisa que aquellas crecidas sin la aplicaci&oacute;n del campo. Las part&iacute;culas policristalinas crecen con la formaci&oacute;n de clusters cuya distribuci&oacute;n espacial puede ser caracterizada bajo relaciones de escalamiento. Del comportamiento de este escalamiento es posible obtener alguna informaci&oacute;n sobre las correlaciones espaciales que ocurren durante la coprecipitaci&oacute;n.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Descriptores:</b>  Materiales magn&eacute;ticos; agregaci&oacute;n en el crecimiento cristalino.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2">PACS: 75.50.&#150;y; 81.10.&#150;h; 07.60.Pb</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><a href="/pdf/rmf/v55n2/v55n2a3.pdf" target="_blank">DESCARGAR ART&Iacute;CULO EN FORMATO PDF</a></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Acknowledgments</b></font></p>     <p align="justify"><font face="verdana" size="2">M.E. Mendoza and J.L. Carrillo wish to thank the Secretaria de Estado de Universidades e Investigaci&oacute;n de Espa&ntilde;a for financial support under the grants SAB20050132 and SAB2005&#150;0063. M.E.M. wishes to thank Prof. J. Pascual for hospitality at UAB. J.L.C. wishes to thank Prof. M. Rub&iacute; for hospitality at UB. Partial financial support by CONACyT M&eacute;xico: Grant No. 44296 and U.A.P grants 18/G/EXC/05 and 145&#150;04/EXC/G.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>References</b></font></p>     <!-- ref --><p align="justify"><font face="verdana" size="2">1. M. Yoshimura and J. Livage, <i>MRS Bull. </i><b>25</b> (2000) 12.</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8353542&pid=S0035-001X200900020000300001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p align="justify"><font face="verdana" size="2">2. M. Yoshimura, W.L. Suchanek, and K. 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