<?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>S0035-001X2012000300017</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Synthesis of Potassium and Calcium Uranovanadates, analogues of Carnotite and Metatyuyamunite Minerals]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Requena Yáñez]]></surname>
<given-names><![CDATA[J.L.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Reyes Cortés]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Torres Moye]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Lardizabal]]></surname>
<given-names><![CDATA[D.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Riveros]]></surname>
<given-names><![CDATA[H.]]></given-names>
</name>
<xref ref-type="aff" rid="A03"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Montero Cabrera]]></surname>
<given-names><![CDATA[M.E.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Centro de Investigación en Materiales Avanzados, S.C.  ]]></institution>
<addr-line><![CDATA[Chihuahua Chih.]]></addr-line>
</aff>
<aff id="A02">
<institution><![CDATA[,Universidad Autónoma de Chihuahua Facultad de Ingeniería ]]></institution>
<addr-line><![CDATA[Chihuahua Chih.]]></addr-line>
</aff>
<aff id="A03">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Física ]]></institution>
<addr-line><![CDATA[DF ]]></addr-line>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2012</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2012</year>
</pub-date>
<volume>58</volume>
<numero>3</numero>
<fpage>253</fpage>
<lpage>257</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0035-001X2012000300017&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0035-001X2012000300017&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0035-001X2012000300017&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[The aim of this study was to develop a synthesis of metatyuyamunite (Ca(VUO6)2·3-5H2O) and carnotite (KVUO6·1-3H2O) under hydrothermal conditions. Also, crystals obtained from this synthesis were compared with crystals from melting method. The analyses of synthesis products were performed by X-Ray techniques. X-Ray Diffraction was used for both species identification, whereas Scanning Electron Microscopy was used to analyze their morphology and elemental composition. Both uranovanadates were positive synthesized under hydrothermal conditions; besides, their morphology presents particles agglomerates. Calcium uranovanadate agglomerates contain well-defined crystals, whereas potassium uranovanadate agglomerates consist in fine powder particles.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[El objetivo de este trabajo fue desarrollar una ruta de síntesis de metatyuyamunita (Ca(VUO6)2·3-5H2O) y Carnotita (KVUO6·1-3H2O) en condiciones hidrotermales. Los cristales obtenidos de estas síntesis se compararon con cristales obtenidos por el método de fusión. El análisis de los productos de las síntesis fue realizado mediante técnicas de rayos X. La difracción de rayos X fue utilizada para la identificación de las dos especies, mientras que la Microscopía Electrónica de Barrido se utilizó para analizar su morfología y composición elemental. Ambos uranovanadatos fueron exitosamente sintetizados bajo condiciones hidrotermales, presentando una morfología de aglomerados de partículas. Los aglomerados del uranovanadato de calcio están formados por cristales bien definidos, mientras que los aglomerados del uranovanadato de potasio consisten en partículas de polvo muy finas.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Uranium]]></kwd>
<kwd lng="en"><![CDATA[carnotite]]></kwd>
<kwd lng="en"><![CDATA[metatyuyamunite]]></kwd>
<kwd lng="en"><![CDATA[hydrothermal synthesis]]></kwd>
<kwd lng="en"><![CDATA[crystallization]]></kwd>
<kwd lng="es"><![CDATA[Uranio]]></kwd>
<kwd lng="es"><![CDATA[carnotita]]></kwd>
<kwd lng="es"><![CDATA[metatyuyamunita]]></kwd>
<kwd lng="es"><![CDATA[síntesis hidrotermal]]></kwd>
<kwd lng="es"><![CDATA[cristalización]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="justify"><font face="verdana" size="4">F&iacute;sica de la radiaci&oacute;n</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="4"><b>Synthesis of Potassium and Calcium Uranovanadates, analogues of Carnotite and Metatyuyamunite Minerals</b></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="2"><b>J.L. Requena Y&aacute;&ntilde;ez<sup>a</sup>, M. Reyes Cort&eacute;s<sup>a;b</sup>, E. Torres Moye<sup>a</sup>, D. Lardizabal<sup>a</sup>, H. Riveros<sup>c</sup> and M.E. Montero Cabrera<sup>a;*</sup></b></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><i><sup>a</sup> Centro de Investigaci&oacute;n en Materiales Avanzados, S.C., Chihuahua, Chih.</i> * e&#45;mail: <a href="mailto:elena.montero@cimav.edu.mx">elena.montero@cimav.edu.mx</a> </font></p>     <p align="justify"><font face="verdana" size="2"><i><sup>b</sup> Facultad de Ingenier&iacute;a, Universidad Aut&oacute;noma de Chihuahua, Chihuahua, Chih.   </i></font></p>     <p align="justify"><font face="verdana" size="2"><i><sup>c </sup>Instituto de F&iacute;sica, Universidad Nacional Aut&oacute;noma de M&eacute;xico, DF.</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 20 de octubre de 2011;    <br> aceptado el 10 de abril de 2012</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">The aim of this study was to develop a synthesis of metatyuyamunite (Ca(VUO<sub>6</sub>)<sub>2</sub>&#183;3&#45;5H<sub>2</sub>O) and carnotite (KVUO<sub>6</sub>&#183;1&#45;3H<sub>2</sub>O) under hydrothermal conditions. Also, crystals obtained from this synthesis were compared with crystals from melting method. The analyses of synthesis products were performed by X&#45;Ray techniques. X&#45;Ray Diffraction was used for both species identification, whereas Scanning Electron Microscopy was used to analyze their morphology and elemental composition. Both uranovanadates were positive synthesized under hydrothermal conditions; besides, their morphology presents particles agglomerates. Calcium uranovanadate agglomerates contain well&#45;defined crystals, whereas potassium uranovanadate agglomerates consist in fine powder particles.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Keywords:</b> Uranium; carnotite; metatyuyamunite; hydrothermal synthesis; crystallization.</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">El objetivo de este trabajo fue desarrollar una ruta de s&iacute;ntesis de metatyuyamunita (Ca(VUO<sub>6</sub>)<sub>2</sub>&#183;3&#45;5H<sub>2</sub>O) y Carnotita (KVUO<sub>6</sub>&#183;1&#45;3H<sub>2</sub>O) en condiciones hidrotermales. Los cristales obtenidos de estas s&iacute;ntesis se compararon con cristales obtenidos por el m&eacute;todo de fusi&oacute;n. El an&aacute;lisis de los productos de las s&iacute;ntesis fue realizado mediante t&eacute;cnicas de rayos X. La difracci&oacute;n de rayos X fue utilizada para la identificaci&oacute;n de las dos especies, mientras que la Microscop&iacute;a Electr&oacute;nica de Barrido se utiliz&oacute; para analizar su morfolog&iacute;a y composici&oacute;n elemental. Ambos uranovanadatos fueron exitosamente sintetizados bajo condiciones hidrotermales, presentando una morfolog&iacute;a de aglomerados de part&iacute;culas. Los aglomerados del uranovanadato de calcio est&aacute;n formados por cristales bien definidos, mientras que los aglomerados del uranovanadato de potasio consisten en part&iacute;culas de polvo muy finas.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Descriptores:</b> Uranio; carnotita; metatyuyamunita; s&iacute;ntesis hidrotermal; cristalizaci&oacute;n.</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: 61.66.Fn; 81.10.&#45;h.</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/v58n3/v58n3a17.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">We want to thanks David Singer, from University of California at Berkeley, USA; Prof. Peter C. Burns and Laurent Jouffret from University of Notre Dame, Indiana USA; Miguel Humberto Bocanegra Bernal from CIMAV, Chihuahua, Mexico for discussions and suggestions during the experimental part of this work, and Hector Rubio Arias from UACH, Chihuahua, Mexico for improving the manuscript. This study has been partially supported by SEP&#45;CONACYT Basic Science Project 26040.</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. K.J. Wenrich, P.J. Modreski, R.A. Zielinski, and J.L. Seeley, Am. 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