Microscopic Structure and Thermoelectric Properties of ZnO Ceramics with Various Added Elements Prepared by the Polymerized Complex Method
We have synthesized ZnO ceramics added with Ag or Y by the polymerized complex method. The microscopic structure and the thermoelectric properties such as Seebeck coefficient, electrical resistivity and thermal conductivity of the materials are much affected by the added elements. Ag metal or Y<SUB>2</SUB>O<SUB>3</SUB> oxide was observed as a second phase in the sintered Ag-or Y-added samples, respectively. The crystal grain size of the Ag-or Y-added samples is much smaller than that of the non-added samples. The absolute values of the Seebeck coefficient and electrical resistivity for the Y-added samples increase with an increase of the Y content, while those for the Ag-added samples are almost constant independent of the Ag content. More reduction in the thermal conductivity was observed in the Y-added samples. These behaviors are ascribed to the physical properties of the precipitated second phases.
粉体および粉末冶金 50(11), 944-947, 2003-11-15
Japan Society of Powder and Powder Metallurgy