<?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>1665-3521</journal-id>
<journal-title><![CDATA[Superficies y vacío]]></journal-title>
<abbrev-journal-title><![CDATA[Superf. vacío]]></abbrev-journal-title>
<issn>1665-3521</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Mexicana de Ciencia y Tecnología de Superficies y Materiales A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1665-35212005000100006</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Influencia del método de síntesis en la respuesta de resonancia paramagnética electrónica en manganitas]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gutiérrez]]></surname>
<given-names><![CDATA[M. P.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Montiel]]></surname>
<given-names><![CDATA[H.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Valenzuela]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Alvarez]]></surname>
<given-names><![CDATA[G.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Zamorano]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional Autónoma de México Facultad de Química Departamento de Química Inorgánica y Nuclear]]></institution>
<addr-line><![CDATA[ México, DF.]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Investigaciones en Materiales Departamento de Materiales Metálicos y Cerámicos]]></institution>
<addr-line><![CDATA[ México, DF.]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Instituto Politécnico Nacional Escuela Superior de Física y Matemáticas Departamento de Ciencia de los Materiales]]></institution>
<addr-line><![CDATA[ México DF.]]></addr-line>
<country>Mexico</country>
</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>18</volume>
<numero>1</numero>
<fpage>6</fpage>
<lpage>10</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1665-35212005000100006&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1665-35212005000100006&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1665-35212005000100006&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Presentamos la respuesta de la absorción de microondas de dos muestras policristalinas de composición La0.85Sr0.15MnO3, preparadas por dos rutas de síntesis diferentes: el método cerámico tradicional y la síntesis por medio de un precursor obtenido mediante la técnica sol-gel, seguido de un proceso de sinterización. Las mediciones se realizaron en la banda X (9.2 GHz) con un barrido de campo magnético dc de 0-8000 Gauss, en un intervalo de temperaturas de 300-80 K. Los espectros de Resonancia Paramagnética/Ferromagnética (EPR/FMR) de ambas muestras presentan importantes diferencias, indicando que los procesos de absorción magnética y las temperaturas de transición de fase se ven influenciados por el orden/desorden local modificado por la ruta de síntesis. Nuestros resultados se sustentan en medidas de resistividad dc y de susceptibilidad magnética en función de la temperatura.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract The microwave absorption response for polycrystalline samples La0.85Sr0.15MnO3 prepared by two different methods are compared. Two different samples were prepared: one by the traditional ceramic method and the other by means of a sol-gel precursor followed by a sintering process. Measurements were carried out at X Band (9.2 GHz) with a dc magnetic field up to 8000 Gauss, in the 300-80 K temperature range. Electron Paramagnetic/Ferromagnetic resonance (EPR/FMR) spectra of both samples show important differences indicating that the magnetic absorption processes and the phase transition temperatures are sensitive to the local order/disorder induced by the route of preparation. These results are supported by dc resistivity and magnetic susceptibility measurements as a function of the temperature.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Resonancia paramagnética electrónica]]></kwd>
<kwd lng="es"><![CDATA[Resonancia ferromagnética electrónica]]></kwd>
<kwd lng="es"><![CDATA[Manganitas]]></kwd>
<kwd lng="en"><![CDATA[Electron paramagnetic resonance]]></kwd>
<kwd lng="en"><![CDATA[Ferromagnetic resonance]]></kwd>
<kwd lng="en"><![CDATA[Manganites]]></kwd>
</kwd-group>
</article-meta>
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