Crystal structure, thermal expansion and electrical conductivity of perovskite oxides BaxSr1-xCo0.8Fe0.2O3-δ (0.3 ≤ x ≤ 0.7)
BaxSr1-xCo0.8Fe0.2O3-delta (x = 0.3-0.7) composite oxides were prepared and characterised. The crystal structure, thermal expansion and electrical conductivity were studied by XRD, dilatometry and four-point DC, respectively. For x up to 0.6 compositions, cubic perovskite structure was obtained and...
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| Veröffentlicht in: | Journal of the European Ceramic Society 2006, Vol.26 (13), p.2827-2832 |
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| container_title | Journal of the European Ceramic Society |
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| creator | Wei, Bo Lü, Zhe Huang, Xiqiang Miao, Jipeng Sha, Xueqing Xin, Xianshuang Su, Wenhui |
| description | BaxSr1-xCo0.8Fe0.2O3-delta (x = 0.3-0.7) composite oxides were prepared and characterised. The crystal structure, thermal expansion and electrical conductivity were studied by XRD, dilatometry and four-point DC, respectively. For x up to 0.6 compositions, cubic perovskite structure was obtained and the lattice constant increased with increasing Ba content. A large amount of lattice oxygen was lost below 550 C, which had significant effects on thermal and electrical properties. All the dilatometric curves had an inflection at about 350-500 C, and thermal expansion coefficients were very high between 50 and 1000 C with a value > 20 x 10 exp(-6)/C. The conductivity was > 30 S/cm above 500 C except for x > 0.5 compositions. Conductivity relaxation behaviour was also investigated at 400-550 C. Generally, Ba0.4Sr0.6Co0.8Fe0.2O3-delta and Ba0.5Sr0.5Co0.8Fe0.2O3-delta are potential cathode materials. 24 refs. |
| doi_str_mv | 10.1016/j.jeurceramsoc.2005.06.047 |
| format | Article |
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The crystal structure, thermal expansion and electrical conductivity were studied by XRD, dilatometry and four-point DC, respectively. For x up to 0.6 compositions, cubic perovskite structure was obtained and the lattice constant increased with increasing Ba content. A large amount of lattice oxygen was lost below 550 C, which had significant effects on thermal and electrical properties. All the dilatometric curves had an inflection at about 350-500 C, and thermal expansion coefficients were very high between 50 and 1000 C with a value > 20 x 10 exp(-6)/C. The conductivity was > 30 S/cm above 500 C except for x > 0.5 compositions. Conductivity relaxation behaviour was also investigated at 400-550 C. 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The crystal structure, thermal expansion and electrical conductivity were studied by XRD, dilatometry and four-point DC, respectively. For x up to 0.6 compositions, cubic perovskite structure was obtained and the lattice constant increased with increasing Ba content. A large amount of lattice oxygen was lost below 550 C, which had significant effects on thermal and electrical properties. All the dilatometric curves had an inflection at about 350-500 C, and thermal expansion coefficients were very high between 50 and 1000 C with a value > 20 x 10 exp(-6)/C. The conductivity was > 30 S/cm above 500 C except for x > 0.5 compositions. Conductivity relaxation behaviour was also investigated at 400-550 C. Generally, Ba0.4Sr0.6Co0.8Fe0.2O3-delta and Ba0.5Sr0.5Co0.8Fe0.2O3-delta are potential cathode materials. 24 refs.</description><subject>Applied sciences</subject><subject>Building materials. Ceramics. 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Glasses</topic><topic>Ceramic industries</topic><topic>Chemical industry and chemicals</topic><topic>Electrotechnical and electronic ceramics</topic><topic>Exact sciences and technology</topic><topic>Technical ceramics</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Wei, Bo</creatorcontrib><creatorcontrib>Lü, Zhe</creatorcontrib><creatorcontrib>Huang, Xiqiang</creatorcontrib><creatorcontrib>Miao, Jipeng</creatorcontrib><creatorcontrib>Sha, Xueqing</creatorcontrib><creatorcontrib>Xin, Xianshuang</creatorcontrib><creatorcontrib>Su, Wenhui</creatorcontrib><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>Ceramic Abstracts</collection><collection>Technology Research Database</collection><collection>Materials Research Database</collection><jtitle>Journal of the European Ceramic Society</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Wei, Bo</au><au>Lü, Zhe</au><au>Huang, Xiqiang</au><au>Miao, Jipeng</au><au>Sha, Xueqing</au><au>Xin, Xianshuang</au><au>Su, Wenhui</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Crystal structure, thermal expansion and electrical conductivity of perovskite oxides BaxSr1-xCo0.8Fe0.2O3-δ (0.3 ≤ x ≤ 0.7)</atitle><jtitle>Journal of the European Ceramic Society</jtitle><date>2006</date><risdate>2006</risdate><volume>26</volume><issue>13</issue><spage>2827</spage><epage>2832</epage><pages>2827-2832</pages><issn>0955-2219</issn><eissn>1873-619X</eissn><abstract>BaxSr1-xCo0.8Fe0.2O3-delta (x = 0.3-0.7) composite oxides were prepared and characterised. The crystal structure, thermal expansion and electrical conductivity were studied by XRD, dilatometry and four-point DC, respectively. For x up to 0.6 compositions, cubic perovskite structure was obtained and the lattice constant increased with increasing Ba content. A large amount of lattice oxygen was lost below 550 C, which had significant effects on thermal and electrical properties. All the dilatometric curves had an inflection at about 350-500 C, and thermal expansion coefficients were very high between 50 and 1000 C with a value > 20 x 10 exp(-6)/C. The conductivity was > 30 S/cm above 500 C except for x > 0.5 compositions. Conductivity relaxation behaviour was also investigated at 400-550 C. Generally, Ba0.4Sr0.6Co0.8Fe0.2O3-delta and Ba0.5Sr0.5Co0.8Fe0.2O3-delta are potential cathode materials. 24 refs.</abstract><cop>Oxford</cop><pub>Elsevier</pub><doi>10.1016/j.jeurceramsoc.2005.06.047</doi><tpages>6</tpages></addata></record> |
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| subjects | Applied sciences Building materials. Ceramics. Glasses Ceramic industries Chemical industry and chemicals Electrotechnical and electronic ceramics Exact sciences and technology Technical ceramics |
| title | Crystal structure, thermal expansion and electrical conductivity of perovskite oxides BaxSr1-xCo0.8Fe0.2O3-δ (0.3 ≤ x ≤ 0.7) |
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