<?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>S0035-001X2003000100004</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Grain growth in polycrystalline Ba0,5Sr0,5TiO3 ceramics prepared at different sintering times]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[García]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Portelles]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Martínez]]></surname>
<given-names><![CDATA[F.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Font]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Quiñones]]></surname>
<given-names><![CDATA[J.R.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Siqueiros]]></surname>
<given-names><![CDATA[J.M.]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad de La Habana Facultad de Física Instituto de Ciencia y Tecnología de Materiales]]></institution>
<addr-line><![CDATA[La Habana ]]></addr-line>
<country>Cuba</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Universidad Nacional Autónoma de México Centro de Ciencias de la Materia Condensada ]]></institution>
<addr-line><![CDATA[Ensenada Baja California]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2003</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2003</year>
</pub-date>
<volume>49</volume>
<numero>1</numero>
<fpage>15</fpage>
<lpage>19</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0035-001X2003000100004&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0035-001X2003000100004&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0035-001X2003000100004&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[A grain size study based on the measurements of the maximum permittivity and the microstructure of samples of Sr0,5Ba0,5TiO3 sintered at different time lengths at a fixed temperature is reported. A linear law of grain growth is found from the experimental results and properly described by the Johnson-Mehl-Avrami theory. The model predicts a zero nucleation rate.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Se reportan los resultados de un estudio del comportamiento del tamaño de grano basado en medidas de permitividad dieléctrica máxima y en la microestructura de muestras de Sr0,5Ba0,5TiO3 sinterizadas durante diferentes tiempos a temperatura fija. De los resultados experimentales se encuentra una ley lineal de crecimiento del grano con el tiempo de sinterizado descrita adecuadamente por la teoría de Johnson-Mehl-Avrami. El modelo predice una tasa cero de nucleación.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Grain size]]></kwd>
<kwd lng="en"><![CDATA[sintering time]]></kwd>
<kwd lng="en"><![CDATA[BST]]></kwd>
<kwd lng="en"><![CDATA[dielectric permittivity]]></kwd>
<kwd lng="es"><![CDATA[Tamaño de grano]]></kwd>
<kwd lng="es"><![CDATA[tiempo de sinterizado]]></kwd>
<kwd lng="es"><![CDATA[BST]]></kwd>
<kwd lng="es"><![CDATA[permitividad dieléctrica]]></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>Grain growth in polycrystalline Ba<sub>0,5</sub>Sr<sub>0,5</sub>TiO<sub>3</sub></b> <b>ceramics prepared at different sintering times</b></font></p>      <p align="center"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="center"><font face="verdana" size="2"><b>S. Garc&iacute;a<sup>a</sup>, J. Portelles<sup>a</sup>, F. Mart&iacute;nez<sup>a</sup>, R. Font<sup>a</sup>, J.R. Qui&ntilde;ones<sup>a</sup> y J.M. Siqueiros<sup>b</sup></b></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><sup>a</sup> <i>Facultad de F&iacute;sica&#45;IMRE, Universidad de la Habana, San L&aacute;zaro y L, 10400, CUBA.</i></font></p>  	    <p align="justify"><font face="verdana" size="2"><sup>b</sup> <i>Centro de Ciencias de la Materia Condensada, Universidad Nacional Aut&oacute;noma de M&eacute;xico, Apartado Postal 2681, Ensenada, Baja California 22800, M&Eacute;XICO.</i></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 7 de noviembre de 2001.    <br> 	Aceptado el 22 de octubre de 2002.</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">A grain size study based on the measurements of the maximum permittivity and the microstructure of samples of Sr<sub>0,5</sub>Ba<sub>0,5</sub>TiO<sub>3</sub> sintered at different time lengths at a fixed temperature is reported. A linear law of grain growth is found from the experimental results and properly described by the Johnson&#45;Mehl&#45;Avrami theory. The model predicts a zero nucleation rate.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Keywords:</b> Grain size; sintering time; BST; dielectric permittivity.</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 reportan los resultados de un estudio del comportamiento del tama&ntilde;o de grano basado en medidas de permitividad diel&eacute;ctrica m&aacute;xima y en la microestructura de muestras de Sr<sub>0,5</sub>Ba<sub>0,5</sub>TiO<sub>3</sub> sinterizadas durante diferentes tiempos a temperatura fija. De los resultados experimentales se encuentra una ley lineal de crecimiento del grano con el tiempo de sinterizado descrita adecuadamente por la teor&iacute;a de Johnson&#45;Mehl&#45;Avrami. El modelo predice una tasa cero de nucleaci&oacute;n.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Descriptores:</b> Tama&ntilde;o de grano; tiempo de sinterizado; BST; permitividad diel&eacute;ctrica.</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: 77.84.&#45;s; 77.84.Dy; 81.35.&#43;k; 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/v49n1/v49n1a4.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">This work was partially sponsored by CoNaCyT Proj. No. 26314E DGAPA Proj. No. IN115098. We thank I. Gradilla, G. Soto and E. Aparicio for their technical help. S. Garc&iacute;a thanks DGIA&#45;UNAM for its financial support.</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.&nbsp;I. Kingon, S.K. Streiffer, C. Basceri, and S.R. Summerfelt, <i>MRS Bulletin</i> <b>21</b> (1996) 46.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8292504&pid=S0035-001X200300010000400001&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.&nbsp;J.M. Siqueiros <i>et al., Rev. Mex. 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