کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1618476 1005706 2010 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
High-temperature transport and thermoelectric properties of Ca3Co4−xTixO9
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
High-temperature transport and thermoelectric properties of Ca3Co4−xTixO9
چکیده انگلیسی

We report the high-temperature transport and thermoelectric properties of Co-site doped Ca3Co4−xTixO9 system. The results reveal that both resistivity and thermopower increase monotonously with Ti doping. When the relative Ti content is not more than x = 0.2, the substitution takes place in Ca2CoO3 sublayer; in contrast, if the relative Ti content reaches x = 0.3, the doped Ti ions may exist in both Ca2CoO3 and CoO2 sublayers. As the Co ions in CoO2 layer are substituted, the transport mechanism of the system varies, and the electronic correlation is pronounced enhanced. These changes induce a noticeable increase in thermopower. The figure of merit ZT value of Ca3Co3.7Ti0.3O9 is close to 0.3 at 1000 K, suggesting that Ti doped Ca3Co4O9 series are promising thermoelectric oxides for high-temperature applications.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 501, Issue 1, 2 July 2010, Pages 115–119
نویسندگان
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