摘要
采用固相反应和真空热压法,以CaSi2、Mg、Si为原料制备Ca取代的Mg2Si基热电材料,研究了钙取代对Mg2Si热电性能的影响。XRD结果表明Ca取代Mg2Si材料成相良好,测量了样品的电导率、Seebeck系数及热导率。由于Ca和Mg电负性、离子半径的不同,Ca对Mg位的替代对声子形成散射,降低了材料热导率,提高了其热电性能。
Mg 2-x CaxSi（x=0,0.03,0.05,0.07）thermoelectric materials have been prepared by solid state reaction and hot pressing techniques.The influence of Ca substitution on the thermoelectric properties has been investigated in detail.The XRD results proved that the prepared materials were single-phased.The electrical conductivity,Seebeck coefficient and thermal conductivity were measured.Because of the electro negativity and ionic radius difference between Ca and Mg,the substitution of Ca for Mg reduces the thermal conductivity obviously,and improves the thermoelectric properties.
出处
《材料科学与工程学报》
CAS
CSCD
北大核心
2010年第2期260-262,255,共4页
Journal of Materials Science and Engineering
关键词
MG2SI
热电材料
固相反应
Mg2Si
thermoelectric material
solid state reaction
