<?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>S0035-001X2020000100047</article-id>
<article-id pub-id-type="doi">10.31349/revmexfis.66.47</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[A comparative study between the addition of nano and micro-particles of Co3O4 on the electrical and microstructural properties of a ceramic system based on SnO2]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Miranda-López]]></surname>
<given-names><![CDATA[M.I.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Hernández]]></surname>
<given-names><![CDATA[M.B.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vera-Barrios]]></surname>
<given-names><![CDATA[B.S.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Toxqui-Teran]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Aguilar-Martínez]]></surname>
<given-names><![CDATA[J.A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Autónoma de Nuevo León Facultad de Ingeniería Mecánica y Eléctrica ]]></institution>
<addr-line><![CDATA[Apodaca N.L.]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Tecnológico de Monterrey Escuela de Ingeniería y Ciencias ]]></institution>
<addr-line><![CDATA[Monterrey N.L.]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Nacional de Moquegua Facultad de Ingeniería de Minas ]]></institution>
<addr-line><![CDATA[Moquegua ]]></addr-line>
<country>Peru</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Centro de Investigación en Materiales Avanzados, S.C.  ]]></institution>
<addr-line><![CDATA[Apodaca N.L.]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>02</month>
<year>2020</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>02</month>
<year>2020</year>
</pub-date>
<volume>66</volume>
<numero>1</numero>
<fpage>47</fpage>
<lpage>55</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0035-001X2020000100047&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0035-001X2020000100047&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0035-001X2020000100047&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract A comparative study between the addition of Co3O4 micro-particles and nano-particles as a densifying dopant of a SnO2 based varistor system was conducted. The ceramic composition was (99.9-X) %SnO2-X % Co3O4-0.05 %Cr2O3-0.05 %Nb2O5 where X = 0, 0.5, 1.0, 2.0 and 4.0 mol%. Two particle sizes of Co3O4 were used (~ 5 &#956;m and ~50 nm). The addition of 0.5 mol% of Co3O4 nano-particles promoted an increase of grain size of the sintered samples up to 7.9 &#956;m, that is, the maximum value among all variations. Characterization techniques such as TGA, DTA, XRD, and Rietveld analysis revealed a decrease of 16 o C in the formation temperature of Co2SnO4 as well as an increase of 2.6 wt% in the amount of such phase with the use of 4.0 mol% of Co3O4 nano-particles in comparison with micro-particles. Statistical analysis indicated that the addition of nano-particles of Co3O4 yielded better repeatability on the densification of ceramic samples. Also, residual porosity was decreased. Electrical breakdown and non-linear coefficient values correspond to a non-ohmic behavior with a potential application for manufacturing high voltage varistors. The findings of this work can be used as a reference for conducting a later study to improve the electrical properties or even to lower the sintering temperature.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Electrical properties]]></kwd>
<kwd lng="en"><![CDATA[varistors]]></kwd>
<kwd lng="en"><![CDATA[sintering]]></kwd>
<kwd lng="en"><![CDATA[grain boundaries]]></kwd>
<kwd lng="en"><![CDATA[breakdown voltage]]></kwd>
<kwd lng="en"><![CDATA[81.20.Ev]]></kwd>
<kwd lng="en"><![CDATA[61.05.cp]]></kwd>
<kwd lng="en"><![CDATA[84.32.Ff]]></kwd>
</kwd-group>
</article-meta>
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