Dielectric properties, complex impedance and electrical conductivity of Fe2TiO5 nanopowder compacts and bulk samples at elevated temperatures
In this work we have investigated changes in dielectric properties, electrical conductivity and complex impedance of Fe 2 TiO 5 nanopowder compacts and bulk samples as a function of elevated temperature (room to 423 K compacts, to 443 K bulk samples), frequency (100 Hz–1 MHz) and composition (starti...
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| Veröffentlicht in: | Journal of materials science. Materials in electronics 2017-03, Vol.28 (6), p.4796-4806 |
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| creator | Nikolic, M. V. Sekulic, D. L. Vasiljevic, Z. Z. Lukovic, M. D. Pavlovic, V. B. Aleksic, O. S. |
| description | In this work we have investigated changes in dielectric properties, electrical conductivity and complex impedance of Fe
2
TiO
5
nanopowder compacts and bulk samples as a function of elevated temperature (room to 423 K compacts, to 443 K bulk samples), frequency (100 Hz–1 MHz) and composition (starting molar ratio of Fe
2
O
3
and TiO
2
1:1—PSB11 and 1:1.5—PSB115). XRD, SEM and TEM analysis of PSB11 and PSB115 powders obtained by a simple solid state process from starting hematite and anatase nanopowders confirmed the formation of nanostructured orthorhombic pseudobrookite with small amounts of excess hematite and rutile. The dielectric constant decreased with frequency and temperature for both compacts and bulk samples. Higher values were determined for bulk samples also reflecting the influence of sample composition. Change in the dielectric loss also reflected the influence of sample composition showing one maximum at high frequencies for compacts, and two maxima at room temperature for bulk samples. Complex impedance was analyzed using equivalent circuits and showed in the case of compacts the influence of both grain and grain boundary components, while in the case of bulk samples the dominant influence of grain boundaries. The temperature dependence of the determined grain and grain boundary resistance for compacts and grain boundary resistance for bulk samples was analyzed using the adiabatic small polaron hopping model enabling determination of activation energies for conduction, while the temperature dependence of relaxation times enabled determination of activation energies for relaxation. Changes in electrical conductivity for compacts and bulk samples followed Jonscher’s power law. The change of the determined frequency constant with temperature showed that at elevated temperatures the quantum mechanical-tunneling model for the case of small polaron hopping explains the conduction mechanism occurring in both compacts and bulk samples. |
| doi_str_mv | 10.1007/s10854-016-6125-6 |
| format | Article |
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2
TiO
5
nanopowder compacts and bulk samples as a function of elevated temperature (room to 423 K compacts, to 443 K bulk samples), frequency (100 Hz–1 MHz) and composition (starting molar ratio of Fe
2
O
3
and TiO
2
1:1—PSB11 and 1:1.5—PSB115). XRD, SEM and TEM analysis of PSB11 and PSB115 powders obtained by a simple solid state process from starting hematite and anatase nanopowders confirmed the formation of nanostructured orthorhombic pseudobrookite with small amounts of excess hematite and rutile. The dielectric constant decreased with frequency and temperature for both compacts and bulk samples. Higher values were determined for bulk samples also reflecting the influence of sample composition. Change in the dielectric loss also reflected the influence of sample composition showing one maximum at high frequencies for compacts, and two maxima at room temperature for bulk samples. Complex impedance was analyzed using equivalent circuits and showed in the case of compacts the influence of both grain and grain boundary components, while in the case of bulk samples the dominant influence of grain boundaries. The temperature dependence of the determined grain and grain boundary resistance for compacts and grain boundary resistance for bulk samples was analyzed using the adiabatic small polaron hopping model enabling determination of activation energies for conduction, while the temperature dependence of relaxation times enabled determination of activation energies for relaxation. Changes in electrical conductivity for compacts and bulk samples followed Jonscher’s power law. The change of the determined frequency constant with temperature showed that at elevated temperatures the quantum mechanical-tunneling model for the case of small polaron hopping explains the conduction mechanism occurring in both compacts and bulk samples.</description><identifier>ISSN: 0957-4522</identifier><identifier>EISSN: 1573-482X</identifier><identifier>DOI: 10.1007/s10854-016-6125-6</identifier><language>eng</language><publisher>New York: Springer US</publisher><subject>Activation energy ; Adiabatic flow ; Anatase ; Bulk sampling ; Characterization and Evaluation of Materials ; Chemistry and Materials Science ; Compacts ; Composition ; Conduction heating ; Copper ; Dielectric loss ; Dielectric properties ; Electrical resistivity ; Equivalent circuits ; Grain boundaries ; Hematite ; High temperature ; Hopping conduction ; Impedance ; Materials Science ; Maxima ; Microstructure ; Optical and Electronic Materials ; Polarons ; Quantum mechanics ; Temperature ; Temperature dependence ; Titanium dioxide</subject><ispartof>Journal of materials science. Materials in electronics, 2017-03, Vol.28 (6), p.4796-4806</ispartof><rights>Springer Science+Business Media New York 2016</rights><rights>Journal of Materials Science: Materials in Electronics is a copyright of Springer, (2016). All Rights Reserved.</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c316t-e84a75243469e647daa6df98285513b8e1e626e4d22fa292889bc6217f302ab73</citedby><cites>FETCH-LOGICAL-c316t-e84a75243469e647daa6df98285513b8e1e626e4d22fa292889bc6217f302ab73</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://link.springer.com/content/pdf/10.1007/s10854-016-6125-6$$EPDF$$P50$$Gspringer$$H</linktopdf><linktohtml>$$Uhttps://link.springer.com/10.1007/s10854-016-6125-6$$EHTML$$P50$$Gspringer$$H</linktohtml><link.rule.ids>314,776,780,27901,27902,41464,42533,51294</link.rule.ids></links><search><creatorcontrib>Nikolic, M. V.</creatorcontrib><creatorcontrib>Sekulic, D. L.</creatorcontrib><creatorcontrib>Vasiljevic, Z. Z.</creatorcontrib><creatorcontrib>Lukovic, M. D.</creatorcontrib><creatorcontrib>Pavlovic, V. B.</creatorcontrib><creatorcontrib>Aleksic, O. S.</creatorcontrib><title>Dielectric properties, complex impedance and electrical conductivity of Fe2TiO5 nanopowder compacts and bulk samples at elevated temperatures</title><title>Journal of materials science. Materials in electronics</title><addtitle>J Mater Sci: Mater Electron</addtitle><description>In this work we have investigated changes in dielectric properties, electrical conductivity and complex impedance of Fe
2
TiO
5
nanopowder compacts and bulk samples as a function of elevated temperature (room to 423 K compacts, to 443 K bulk samples), frequency (100 Hz–1 MHz) and composition (starting molar ratio of Fe
2
O
3
and TiO
2
1:1—PSB11 and 1:1.5—PSB115). XRD, SEM and TEM analysis of PSB11 and PSB115 powders obtained by a simple solid state process from starting hematite and anatase nanopowders confirmed the formation of nanostructured orthorhombic pseudobrookite with small amounts of excess hematite and rutile. The dielectric constant decreased with frequency and temperature for both compacts and bulk samples. Higher values were determined for bulk samples also reflecting the influence of sample composition. Change in the dielectric loss also reflected the influence of sample composition showing one maximum at high frequencies for compacts, and two maxima at room temperature for bulk samples. Complex impedance was analyzed using equivalent circuits and showed in the case of compacts the influence of both grain and grain boundary components, while in the case of bulk samples the dominant influence of grain boundaries. The temperature dependence of the determined grain and grain boundary resistance for compacts and grain boundary resistance for bulk samples was analyzed using the adiabatic small polaron hopping model enabling determination of activation energies for conduction, while the temperature dependence of relaxation times enabled determination of activation energies for relaxation. Changes in electrical conductivity for compacts and bulk samples followed Jonscher’s power law. The change of the determined frequency constant with temperature showed that at elevated temperatures the quantum mechanical-tunneling model for the case of small polaron hopping explains the conduction mechanism occurring in both compacts and bulk samples.</description><subject>Activation energy</subject><subject>Adiabatic flow</subject><subject>Anatase</subject><subject>Bulk sampling</subject><subject>Characterization and Evaluation of Materials</subject><subject>Chemistry and Materials Science</subject><subject>Compacts</subject><subject>Composition</subject><subject>Conduction heating</subject><subject>Copper</subject><subject>Dielectric loss</subject><subject>Dielectric properties</subject><subject>Electrical resistivity</subject><subject>Equivalent circuits</subject><subject>Grain boundaries</subject><subject>Hematite</subject><subject>High temperature</subject><subject>Hopping conduction</subject><subject>Impedance</subject><subject>Materials Science</subject><subject>Maxima</subject><subject>Microstructure</subject><subject>Optical and Electronic Materials</subject><subject>Polarons</subject><subject>Quantum mechanics</subject><subject>Temperature</subject><subject>Temperature dependence</subject><subject>Titanium dioxide</subject><issn>0957-4522</issn><issn>1573-482X</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2017</creationdate><recordtype>article</recordtype><sourceid>BENPR</sourceid><recordid>eNp1kE1LxDAQhoMouH78AG8Br1aTaZKmR1ldFRb2ouAtZNOpVLttTdJVf4T_2ayrePI0MLzvM8xDyAln55yx4iJwpqXIGFeZ4iAztUMmXBZ5JjQ87pIJK2WRCQmwTw5CeGaMKZHrCfm8arBFF33j6OD7AX1sMJxR16-GFt9psxqwsp1DaruK_kZtmwJdNbrYrJv4QfuazhDum4Wkne36oX-r0H8zrIvhu7oc2xca7IaaFnGDWtuIFY2YTngbR4_hiOzVtg14_DMPycPs-n56m80XN3fTy3nmcq5ihlrYQoLIhSpRiaKyVlV1qUFLyfOlRo4KFIoKoLZQgtbl0ingRZ0zsMsiPySnW256-XXEEM1zP_ounTSQPKoChNIpxbcp5_sQPNZm8M3K-g_DmdlYN1vrJlk3G-tGpQ5sOyFluyf0f-T_S187XIc7</recordid><startdate>20170301</startdate><enddate>20170301</enddate><creator>Nikolic, M. V.</creator><creator>Sekulic, D. L.</creator><creator>Vasiljevic, Z. Z.</creator><creator>Lukovic, M. D.</creator><creator>Pavlovic, V. B.</creator><creator>Aleksic, O. S.</creator><general>Springer US</general><general>Springer Nature B.V</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7SP</scope><scope>7SR</scope><scope>8BQ</scope><scope>8FD</scope><scope>8FE</scope><scope>8FG</scope><scope>ABJCF</scope><scope>AFKRA</scope><scope>ARAPS</scope><scope>BENPR</scope><scope>BGLVJ</scope><scope>CCPQU</scope><scope>D1I</scope><scope>DWQXO</scope><scope>F28</scope><scope>FR3</scope><scope>HCIFZ</scope><scope>JG9</scope><scope>KB.</scope><scope>L7M</scope><scope>P5Z</scope><scope>P62</scope><scope>PDBOC</scope><scope>PQEST</scope><scope>PQQKQ</scope><scope>PQUKI</scope><scope>PRINS</scope><scope>S0W</scope></search><sort><creationdate>20170301</creationdate><title>Dielectric properties, complex impedance and electrical conductivity of Fe2TiO5 nanopowder compacts and bulk samples at elevated temperatures</title><author>Nikolic, M. V. ; Sekulic, D. L. ; Vasiljevic, Z. Z. ; Lukovic, M. D. ; Pavlovic, V. B. ; Aleksic, O. S.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c316t-e84a75243469e647daa6df98285513b8e1e626e4d22fa292889bc6217f302ab73</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2017</creationdate><topic>Activation energy</topic><topic>Adiabatic flow</topic><topic>Anatase</topic><topic>Bulk sampling</topic><topic>Characterization and Evaluation of Materials</topic><topic>Chemistry and Materials Science</topic><topic>Compacts</topic><topic>Composition</topic><topic>Conduction heating</topic><topic>Copper</topic><topic>Dielectric loss</topic><topic>Dielectric properties</topic><topic>Electrical resistivity</topic><topic>Equivalent circuits</topic><topic>Grain boundaries</topic><topic>Hematite</topic><topic>High temperature</topic><topic>Hopping conduction</topic><topic>Impedance</topic><topic>Materials Science</topic><topic>Maxima</topic><topic>Microstructure</topic><topic>Optical and Electronic Materials</topic><topic>Polarons</topic><topic>Quantum mechanics</topic><topic>Temperature</topic><topic>Temperature dependence</topic><topic>Titanium dioxide</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Nikolic, M. V.</creatorcontrib><creatorcontrib>Sekulic, D. L.</creatorcontrib><creatorcontrib>Vasiljevic, Z. Z.</creatorcontrib><creatorcontrib>Lukovic, M. D.</creatorcontrib><creatorcontrib>Pavlovic, V. B.</creatorcontrib><creatorcontrib>Aleksic, O. 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Materials in electronics</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Nikolic, M. V.</au><au>Sekulic, D. L.</au><au>Vasiljevic, Z. Z.</au><au>Lukovic, M. D.</au><au>Pavlovic, V. B.</au><au>Aleksic, O. S.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Dielectric properties, complex impedance and electrical conductivity of Fe2TiO5 nanopowder compacts and bulk samples at elevated temperatures</atitle><jtitle>Journal of materials science. Materials in electronics</jtitle><stitle>J Mater Sci: Mater Electron</stitle><date>2017-03-01</date><risdate>2017</risdate><volume>28</volume><issue>6</issue><spage>4796</spage><epage>4806</epage><pages>4796-4806</pages><issn>0957-4522</issn><eissn>1573-482X</eissn><abstract>In this work we have investigated changes in dielectric properties, electrical conductivity and complex impedance of Fe
2
TiO
5
nanopowder compacts and bulk samples as a function of elevated temperature (room to 423 K compacts, to 443 K bulk samples), frequency (100 Hz–1 MHz) and composition (starting molar ratio of Fe
2
O
3
and TiO
2
1:1—PSB11 and 1:1.5—PSB115). XRD, SEM and TEM analysis of PSB11 and PSB115 powders obtained by a simple solid state process from starting hematite and anatase nanopowders confirmed the formation of nanostructured orthorhombic pseudobrookite with small amounts of excess hematite and rutile. The dielectric constant decreased with frequency and temperature for both compacts and bulk samples. Higher values were determined for bulk samples also reflecting the influence of sample composition. Change in the dielectric loss also reflected the influence of sample composition showing one maximum at high frequencies for compacts, and two maxima at room temperature for bulk samples. Complex impedance was analyzed using equivalent circuits and showed in the case of compacts the influence of both grain and grain boundary components, while in the case of bulk samples the dominant influence of grain boundaries. The temperature dependence of the determined grain and grain boundary resistance for compacts and grain boundary resistance for bulk samples was analyzed using the adiabatic small polaron hopping model enabling determination of activation energies for conduction, while the temperature dependence of relaxation times enabled determination of activation energies for relaxation. Changes in electrical conductivity for compacts and bulk samples followed Jonscher’s power law. The change of the determined frequency constant with temperature showed that at elevated temperatures the quantum mechanical-tunneling model for the case of small polaron hopping explains the conduction mechanism occurring in both compacts and bulk samples.</abstract><cop>New York</cop><pub>Springer US</pub><doi>10.1007/s10854-016-6125-6</doi><tpages>11</tpages></addata></record> |
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| source | Springer Nature - Complete Springer Journals |
| subjects | Activation energy Adiabatic flow Anatase Bulk sampling Characterization and Evaluation of Materials Chemistry and Materials Science Compacts Composition Conduction heating Copper Dielectric loss Dielectric properties Electrical resistivity Equivalent circuits Grain boundaries Hematite High temperature Hopping conduction Impedance Materials Science Maxima Microstructure Optical and Electronic Materials Polarons Quantum mechanics Temperature Temperature dependence Titanium dioxide |
| title | Dielectric properties, complex impedance and electrical conductivity of Fe2TiO5 nanopowder compacts and bulk samples at elevated temperatures |
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