کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1296888 1498363 2009 4 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Improvement of Bi2Sr2Co1.8Ox thermoelectric properties by laser floating zone texturing
موضوعات مرتبط
مهندسی و علوم پایه شیمی الکتروشیمی
پیش نمایش صفحه اول مقاله
Improvement of Bi2Sr2Co1.8Ox thermoelectric properties by laser floating zone texturing
چکیده انگلیسی

Thermoelectric performances of cobaltite ceramics can be improved raising the electrical conductivity. This can be performed by increasing the size of grains and aligning them along a preferential direction by the Laser Floating Zone (LFZ) method. In this work, Bi2Sr2Co1.8Ox ceramics have been directionally grown at three different speeds, i.e. 15, 30 and 50 mm/h. Their microstructure and thermoelectric properties are significantly influenced by the LFZ growth conditions. In all cases, the microstructure exhibits alternate cobaltite layers with secondary phases and small CoO inclusions, particularly when the growth is performed at high speeds (30 and 50 mm/h). The thermopower is, nevertheless, higher than usual while electrical resistivity values are similar to those obtained by conventional solid state routes, leading to relatively high power factor values. This result is probably linked to the stacking of different BiSrCoO layers and/or to oxygen vacancies.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Solid State Ionics - Volume 180, Issues 11–13, 22 June 2009, Pages 827–830
نویسندگان
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