Grain-boundary and subgrain-boundary effects on the dielectric properties of CaCu3Ti4O12 ceramics
CaCu3Ti4O12 ceramic samples sintered at different temperatures were studied by measurements of microstructural and dielectric properties. Electron microscopy for thermally-etched samples confirmed a microstructure with subgrains (SG) buried in a crystalline grain. The detailed dielectric properties...
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| Veröffentlicht in: | Journal of physics. D, Applied physics Applied physics, 2007-05, Vol.40 (9), p.2899-2905 |
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| container_title | Journal of physics. D, Applied physics |
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| creator | Cao, Guanghan Feng, Lixin Wang, Cao |
| description | CaCu3Ti4O12 ceramic samples sintered at different temperatures were studied by measurements of microstructural and dielectric properties. Electron microscopy for thermally-etched samples confirmed a microstructure with subgrains (SG) buried in a crystalline grain. The detailed dielectric properties were shown to be conformable with the double-barrier-layer capacitance model. The complex electric modulus analysis revealed unambiguously each contribution of the SG interiors, SG boundaries and grain boundaries to the dielectric constant. Our result clarified how the dielectric properties change with increasing sintering temperature. It was concluded that grain boundaries rather than SG boundaries played the key role in the low-frequency giant dielectric constant in CCTO ceramics. |
| doi_str_mv | 10.1088/0022-3727/40/9/035 |
| format | Article |
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Electron microscopy for thermally-etched samples confirmed a microstructure with subgrains (SG) buried in a crystalline grain. The detailed dielectric properties were shown to be conformable with the double-barrier-layer capacitance model. The complex electric modulus analysis revealed unambiguously each contribution of the SG interiors, SG boundaries and grain boundaries to the dielectric constant. Our result clarified how the dielectric properties change with increasing sintering temperature. It was concluded that grain boundaries rather than SG boundaries played the key role in the low-frequency giant dielectric constant in CCTO ceramics.</description><identifier>ISSN: 0022-3727</identifier><identifier>EISSN: 1361-6463</identifier><identifier>DOI: 10.1088/0022-3727/40/9/035</identifier><identifier>CODEN: JPAPBE</identifier><language>eng</language><publisher>Bristol: IOP Publishing</publisher><subject>Condensed matter: electronic structure, electrical, magnetic, and optical properties ; Dielectric properties of solids and liquids ; Dielectrics, piezoelectrics, and ferroelectrics and their properties ; Exact sciences and technology ; Permittivity (dielectric function) ; Physics</subject><ispartof>Journal of physics. 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D, Applied physics</title><description>CaCu3Ti4O12 ceramic samples sintered at different temperatures were studied by measurements of microstructural and dielectric properties. Electron microscopy for thermally-etched samples confirmed a microstructure with subgrains (SG) buried in a crystalline grain. The detailed dielectric properties were shown to be conformable with the double-barrier-layer capacitance model. The complex electric modulus analysis revealed unambiguously each contribution of the SG interiors, SG boundaries and grain boundaries to the dielectric constant. Our result clarified how the dielectric properties change with increasing sintering temperature. It was concluded that grain boundaries rather than SG boundaries played the key role in the low-frequency giant dielectric constant in CCTO ceramics.</description><subject>Condensed matter: electronic structure, electrical, magnetic, and optical properties</subject><subject>Dielectric properties of solids and liquids</subject><subject>Dielectrics, piezoelectrics, and ferroelectrics and their properties</subject><subject>Exact sciences and technology</subject><subject>Permittivity (dielectric function)</subject><subject>Physics</subject><issn>0022-3727</issn><issn>1361-6463</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2007</creationdate><recordtype>article</recordtype><recordid>eNptkU1LxDAQhoMouK7-AU-5KHiozdem6VGKrsLCXnoP-dRIt61Je_Dfm2WXBdHTMPM-M8y8A8AtRo8YCVEiREhBK1KVDJV1iejqDCww5bjgjNNzsDgBl-AqpU-E0IoLvABqHVXoCz3MvVXxG6rewjTr999V570zU4JDD6cPB21wXc5jMHCMw-jiFFwWPWxUM9M2sC0m0LiodsGka3DhVZfczTEuQfvy3DavxWa7fmueNkUgQkyFdiuDmVXG18JabKzjxjNhtTLOMOs11l5XyGiuqFeOW4GYNZWmhGhLNV2C-8PYvNHX7NIkdyEZ13Wqd8OcJKkFJpSLDN4dQZWM6nxUvQlJjjHs8qkSi4pSTKvMPRy4MIwndW-j3NsoGZK1zD7L0frMFn9ZjOT-N__00B8nb4IU</recordid><startdate>20070507</startdate><enddate>20070507</enddate><creator>Cao, Guanghan</creator><creator>Feng, Lixin</creator><creator>Wang, Cao</creator><general>IOP Publishing</general><general>Institute of Physics</general><scope>IQODW</scope><scope>7U5</scope><scope>8FD</scope><scope>L7M</scope></search><sort><creationdate>20070507</creationdate><title>Grain-boundary and subgrain-boundary effects on the dielectric properties of CaCu3Ti4O12 ceramics</title><author>Cao, Guanghan ; Feng, Lixin ; Wang, Cao</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-i288t-be5c14dacf98dd1cde6cf48dbacec4dfb1bfb70cb6a3fae6d804dc7b322bd3b3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2007</creationdate><topic>Condensed matter: electronic structure, electrical, magnetic, and optical properties</topic><topic>Dielectric properties of solids and liquids</topic><topic>Dielectrics, piezoelectrics, and ferroelectrics and their properties</topic><topic>Exact sciences and technology</topic><topic>Permittivity (dielectric function)</topic><topic>Physics</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Cao, Guanghan</creatorcontrib><creatorcontrib>Feng, Lixin</creatorcontrib><creatorcontrib>Wang, Cao</creatorcontrib><collection>Pascal-Francis</collection><collection>Solid State and Superconductivity Abstracts</collection><collection>Technology Research Database</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>Journal of physics. D, Applied physics</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Cao, Guanghan</au><au>Feng, Lixin</au><au>Wang, Cao</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Grain-boundary and subgrain-boundary effects on the dielectric properties of CaCu3Ti4O12 ceramics</atitle><jtitle>Journal of physics. D, Applied physics</jtitle><date>2007-05-07</date><risdate>2007</risdate><volume>40</volume><issue>9</issue><spage>2899</spage><epage>2905</epage><pages>2899-2905</pages><issn>0022-3727</issn><eissn>1361-6463</eissn><coden>JPAPBE</coden><abstract>CaCu3Ti4O12 ceramic samples sintered at different temperatures were studied by measurements of microstructural and dielectric properties. Electron microscopy for thermally-etched samples confirmed a microstructure with subgrains (SG) buried in a crystalline grain. The detailed dielectric properties were shown to be conformable with the double-barrier-layer capacitance model. The complex electric modulus analysis revealed unambiguously each contribution of the SG interiors, SG boundaries and grain boundaries to the dielectric constant. Our result clarified how the dielectric properties change with increasing sintering temperature. It was concluded that grain boundaries rather than SG boundaries played the key role in the low-frequency giant dielectric constant in CCTO ceramics.</abstract><cop>Bristol</cop><pub>IOP Publishing</pub><doi>10.1088/0022-3727/40/9/035</doi><tpages>7</tpages></addata></record> |
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| source | IOP Publishing Journals; Institute of Physics (IOP) Journals - HEAL-Link |
| subjects | Condensed matter: electronic structure, electrical, magnetic, and optical properties Dielectric properties of solids and liquids Dielectrics, piezoelectrics, and ferroelectrics and their properties Exact sciences and technology Permittivity (dielectric function) Physics |
| title | Grain-boundary and subgrain-boundary effects on the dielectric properties of CaCu3Ti4O12 ceramics |
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