2012 ©
             Publication
Journal Publication
Title of Article thermoelectric properties of transition metals (ไม่ผ่านการอนุมัติ 1321346687) 
Date of Acceptance 2 April 2010 
Journal
     Title of Journal Journal of Alloys and Compounds 
     Standard  
     Institute of Journal Journal of Alloys and Compounds 
     ISBN/ISSN  
     Volume 503 
     Issue
     Month
     Year of Publication 2012 
     Page 431-435 
     Abstract Wereport the synthesis of a thermoelectric oxide Ca3Co4O9 using a sol–gel method with polyvinyl alcohol as the dispersion agent. The transition metals (Cr, Fe, Ni, Cu and Zn) were doped at the Co-site to form Ca3Co3.8M0.2O9. The single phases of the doped Ca3Co3.8M0.2O9 were confirmed by thermogravimetric and differential thermal analysis, and X-ray diffraction patterns. Relatively high porosity was observed in scanning electron micrographs. The density of the samples was the highest for Cu-doped Ca3Co3.8M0.2O9 (78% of the theoretical density). The Young’s modulus and shear modulus measured by the sound velocity method were found to be in the order of tens of GPa, and also found to be highly correlated to the density of the samples. The magnetic properties of the transition metals-doped Ca3Co3.8M0.2O9 were found to be insensitive to the doping and all sintered samples showed paramagnetic behaviour, with susceptibility of ∼10−6 emu/(Oe g), at room temperature. 
     Keyword Thermoelectric, Ca3Co4O9, Sol-gel synthesis, mechanical properties, Magnetic measurement 
Author
515020135-6 Miss NEUNGNUCH LERSSONGKRAM [Main Author]
Science Master's Degree

Reviewing Status มีผู้ประเมินอิสระ 
Status ได้รับการตอบรับให้ตีพิมพ์ 
Level of Publication นานาชาติ 
citation true 
Part of thesis true 
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