<?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>2617-4731</journal-id>
<journal-title><![CDATA[Revista de la Sociedad Científica del Paraguay]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. Soc. cient. Parag.]]></abbrev-journal-title>
<issn>2617-4731</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Científica del Paraguay]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2617-47312025000200044</article-id>
<article-id pub-id-type="doi">10.32480/rscp.2025.30.2.4455</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Síntesis de nanopartículas de óxido de cobre por el método de precipitación química: caracterización cristalográfica mediante difracción de rayos x y refinamiento de Rietveld]]></article-title>
<article-title xml:lang="en"><![CDATA[Synthesis of copper oxide nanoparticles by the chemical precipitation method: crystallographic characterization by x-ray diffraction and Rietveld refinement]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Casanova Ozuna]]></surname>
<given-names><![CDATA[Pablo Javier]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Monteiro]]></surname>
<given-names><![CDATA[Magna]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ferreiro Balbuena]]></surname>
<given-names><![CDATA[Omayra Beatriz]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Espínola Colman]]></surname>
<given-names><![CDATA[María Magdalena]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ries]]></surname>
<given-names><![CDATA[Andreas]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Montiel-Centeno]]></surname>
<given-names><![CDATA[Kiara]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sapag]]></surname>
<given-names><![CDATA[Karim]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Furlong]]></surname>
<given-names><![CDATA[Octavio J.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional de Asunción Facultad Politécnica Laboratorio de Bio y Materiales]]></institution>
<addr-line><![CDATA[San Lorenzo ]]></addr-line>
<country>Paraguay</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Nacional de San Luis Instituto de Física Aplicada Laboratorio de Sólidos Porosos]]></institution>
<addr-line><![CDATA[San Luis ]]></addr-line>
<country>Argentina</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2025</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2025</year>
</pub-date>
<volume>30</volume>
<numero>2</numero>
<fpage>44</fpage>
<lpage>55</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.iics.una.py/scielo.php?script=sci_arttext&amp;pid=S2617-47312025000200044&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.iics.una.py/scielo.php?script=sci_abstract&amp;pid=S2617-47312025000200044&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.iics.una.py/scielo.php?script=sci_pdf&amp;pid=S2617-47312025000200044&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN: Este estudio presenta la síntesis de nanopartículas de óxido de cobre (NPsCuO) mediante el método de precipitación química, con énfasis en su caracterización estructural por difracción de rayos X (XRD) y espectroscopia fotoelectrónica de rayos X (XPS). Las nanopartículas presentan morfología semiesférica y un promedio de tamaño de partícula de 124 nm, según lo revelado por microscopía electrónica de barrido (MEB). El análisis de DRX confirmó la formación de la fase monoclínica, con tamaños de cristalito de ~22 nm. Por medio del refinamiento de Rietveld (Chi² = 1.2) de los espectros de DRX se pudo confirmar que la distancia Cu-O es de 1.96 Å y los ángulos de enlace son 60.67° y 154.57°. El análisis XPS mostró picos Cu 2p&#8323;/&#8322; (~942.7 eV) y Cu 2p&#8321;/&#8322; (~962.7 eV), característicos del estado de oxidación del Cu²&#8314; en CuO. Los resultados confirman la eficacia del método para obtener NPs de CuO de alta pureza.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT: This study presents the synthesis of copper oxide nanoparticles (NPsCuO) employing the chemical precipitation method, with emphasis on product characterization by X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The nanoparticles exhibited a hemispherical morphology with an average diameter of 124 nm, as observed by scanning electron microscopy (SEM). XRD analysis confirmed the formation of a monoclinic phase, with a mean crystallite size of ~22 nm. Rietveld refinement (Chi² = 1.2) and visualization with VESTA revealed a Cu-O distance of 1.96 Å and bond angles of 60.67° and 154.57°. XPS analysis showed Cu 2p&#8323;/&#8322; (~942.7 eV) and Cu 2p&#8321;/&#8322; (~962.7 eV) peaks, characteristic of the Cu²&#8314; state in CuO. The results confirm the effectiveness of the method to obtain NPsCuO of high purity.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[nanopartículas]]></kwd>
<kwd lng="es"><![CDATA[óxido de cobre]]></kwd>
<kwd lng="es"><![CDATA[difracción de rayos X]]></kwd>
<kwd lng="es"><![CDATA[espectroscopia fotoelectrónica]]></kwd>
<kwd lng="es"><![CDATA[refinamiento Rietveld]]></kwd>
<kwd lng="en"><![CDATA[nanoparticles]]></kwd>
<kwd lng="en"><![CDATA[copper oxide]]></kwd>
<kwd lng="en"><![CDATA[X-ray diffraction]]></kwd>
<kwd lng="en"><![CDATA[photoelectron spectroscopy]]></kwd>
<kwd lng="en"><![CDATA[Rietveld refinement]]></kwd>
</kwd-group>
</article-meta>
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