<?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>S0035-001X2005000300010</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Stoichiometric hydroxyapatite obtained by precipitation and sol gel processes]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Guzmán Vázquez]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Piña Barba]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Munguía]]></surname>
<given-names><![CDATA[N.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Investigaciones en Materiales ]]></institution>
<addr-line><![CDATA[México D.F.]]></addr-line>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2005</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2005</year>
</pub-date>
<volume>51</volume>
<numero>3</numero>
<fpage>284</fpage>
<lpage>293</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0035-001X2005000300010&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0035-001X2005000300010&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0035-001X2005000300010&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Three methods for obtaining hydroxiapatite (HA) are described. HA is a very interesting ceramic because of its many medical applications. The first two precipitation methods start from calcium and phosphorous compounds, whereas the third method is a sol-gel process that uses alcoxides. The products were characterized and compared. The observed differences are important for practical applications.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Se describen tres métodos para obtener hidroxiapatita (HA). La HA es una cerámica muy interesante por sus múltiples aplicaciones médicas. Los primeros dos métodos de precipitación parten de compuestos de calcio y fósforo, mientras que el tercer método es un proceso sol-gel que usa alcóxidos. Los productos fueron caracterizados y comparados entre sí. Las diferencias observadas son importantes para aplicaciones prácticas.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Hydroxyapatite]]></kwd>
<kwd lng="en"><![CDATA[sol-gel]]></kwd>
<kwd lng="en"><![CDATA[calcium phosphate]]></kwd>
<kwd lng="en"><![CDATA[ICP-UES]]></kwd>
<kwd lng="es"><![CDATA[Hidroxiapatita]]></kwd>
<kwd lng="es"><![CDATA[sol-gel]]></kwd>
<kwd lng="es"><![CDATA[fosfato de calcio]]></kwd>
<kwd lng="es"><![CDATA[ICP-UES]]></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>Stoichiometric hydroxyapatite obtained by precipitation and sol gel processes</b></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="center"><font face="verdana" size="2"><b>C. Guzm&aacute;n V&aacute;zquez, C. Pi&ntilde;a Barba, and N. Mungu&iacute;a</b></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><i>Instituto de Investigaciones en Materiales, UNAM, Ciudad Universitaria, Apartado Postal 70&#45;360 M&eacute;xico 04510 D.F., e&#45;mail:</i> <a href="mailto:caroguz@servidor.unam.mx"><i>caroguz@servidor.unam.mx</i></a><i>,</i> <a href="mailto:mcpb@servidor.unam.mx"><i>mcpb@servidor.unam.mx</i></a><i>,</i> <a href="mailto:muna@servidor.unam.mx"><i>muna@servidor.unam.mx</i></a></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Recibido el 22 de noviembre de 2004.    <br> 	Aceptado el 3 de marzo de 2005.</font></p>  	    <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">Three methods for obtaining hydroxiapatite (HA) are described. HA is a very interesting ceramic because of its many medical applications. The first two precipitation methods start from calcium and phosphorous compounds, whereas the third method is a sol&#45;gel process that uses alcoxides. The products were characterized and compared. The observed differences are important for practical applications.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Keywords:</b> Hydroxyapatite; sol&#45;gel; calcium phosphate; ICP&#45;UES.</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 describen tres m&eacute;todos para obtener hidroxiapatita (HA). La HA es una cer&aacute;mica muy interesante por sus m&uacute;ltiples aplicaciones m&eacute;dicas. Los primeros dos m&eacute;todos de precipitaci&oacute;n parten de compuestos de calcio y f&oacute;sforo, mientras que el tercer m&eacute;todo es un proceso sol&#45;gel que usa alc&oacute;xidos. Los productos fueron caracterizados y comparados entre s&iacute;. Las diferencias observadas son importantes para aplicaciones pr&aacute;cticas.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Descriptores:</b> Hidroxiapatita; sol&#45;gel; fosfato de calcio; ICP&#45;UES.</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2">PACS: 81.20 Fw; 81.40&#45;z</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><a href="/pdf/rmf/v51n3/v51n3a10.pdf" target="_blank">DESCARGAR ART&Iacute;CULO EN FORMATO PDF</a></font></p>  	    <p align="justify">&nbsp;</p> 	    <p align="justify"><font face="verdana" size="2"><b>References</b></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">1. Rao R. Ramachandra, H.N. Roopa, and T.S. Kannan, <i>J. Mater. Sci. Mater. Med.</i> <b>8</b>(1997) 511.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8310261&pid=S0035-001X200500030001000001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">2. Tas A. Cuney, F. Korkusuz, M. Timicin, and N. Akkas, <i>J. Mater. Sci. Mater. Med.</i> <b>8</b> (1997) 91.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8310263&pid=S0035-001X200500030001000002&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>  	    ]]></body>
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