<?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>S0035-001X2019000600590</article-id>
<article-id pub-id-type="doi">10.31349/revmexfis.65.590</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Complex dielectric behavior of doped polyaniline conducting polymer at microwave frequencies using time domain reflectometry]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Bijwe]]></surname>
<given-names><![CDATA[D.R.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Yawale]]></surname>
<given-names><![CDATA[S.S.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Kumbharkhane]]></surname>
<given-names><![CDATA[A.C.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Peng]]></surname>
<given-names><![CDATA[H.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Yawale]]></surname>
<given-names><![CDATA[D.S.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Yawale]]></surname>
<given-names><![CDATA[S.P.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Sydenham College of Commerce and Economics  ]]></institution>
<addr-line><![CDATA[Churchgate Mumbai]]></addr-line>
</aff>
<aff id="Af2">
<institution><![CDATA[,Swami Ramanand Tirth Marathwada University School of Physical Sciences ]]></institution>
<addr-line><![CDATA[Nanded ]]></addr-line>
<country>India</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,East China Normal University Department of Optoelectronics ]]></institution>
<addr-line><![CDATA[Shanghai ]]></addr-line>
<country>China</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Shri Shivaji Science College Department of Physics ]]></institution>
<addr-line><![CDATA[Amravati Maharashtra]]></addr-line>
<country>India</country>
</aff>
<aff id="Af5">
<institution><![CDATA[,Govt. Vidarbha Institute of Science and Humanities Department of Physics ]]></institution>
<addr-line><![CDATA[Amravati Maharashtra]]></addr-line>
<country>India</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2019</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2019</year>
</pub-date>
<volume>65</volume>
<numero>6</numero>
<fpage>590</fpage>
<lpage>600</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0035-001X2019000600590&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0035-001X2019000600590&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0035-001X2019000600590&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Nano size Tin Oxide is prepared in the laboratory from tin tetrachloride SnCl4 and ammonia solution. The polyaniline (PAni) conducting polymer is synthesized by chemical oxidation method using ammonium persulphate as oxidizing agent. The PAni-SnO2 composite was prepared by insitu method. Scanning electron microscopy (SEM) results confirm the particle size of SnO2 in the range of 30-48 nm. Dielectric behavior of nanocomposite of PAni-SnO2 was studied in the frequency range 0.01- 20 GHz at -5, 0, 5, 10, 15, 20 and 25°C. The dielectric constant (real part &#120576;') and dielectric loss (imaginary part &#120576;") have been evaluated. The relaxation time (&#964;, &#964;0, and &#964;1) are calculated. The relaxation time was found to be of the order of ps. The dielectric properties of the solids in the form of powders may be useful in understanding the structural behavior of particles in an alternating field. These studies may also be used to formulate models for predicting the dielectric properties. The microwave absorbing property is decided from the dielectric loss of the material. It is observed that the PAni-SnO2 composite can be a good electromagnetic shielding material.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Dielectric constant]]></kwd>
<kwd lng="en"><![CDATA[relaxation time]]></kwd>
<kwd lng="en"><![CDATA[polyaniline (PAni) and SnO2]]></kwd>
<kwd lng="en"><![CDATA[PAni-SnO2 nano-composite]]></kwd>
<kwd lng="en"><![CDATA[microwave measurements]]></kwd>
<kwd lng="en"><![CDATA[TDR]]></kwd>
<kwd lng="en"><![CDATA[electromagnetic shielding]]></kwd>
<kwd lng="en"><![CDATA[61.41+e]]></kwd>
<kwd lng="en"><![CDATA[61.43-j]]></kwd>
<kwd lng="en"><![CDATA[72.80Le]]></kwd>
<kwd lng="en"><![CDATA[77.22]]></kwd>
<kwd lng="en"><![CDATA[78.70]]></kwd>
</kwd-group>
</article-meta>
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