稀有金属材料与工程
稀有金屬材料與工程
희유금속재료여공정
RARE METAL MATERIALS AND ENGINEERNG
2009年
z2期
315-318
,共4页
尚鹏鹏%张波萍%李敬锋%赵立东%刘玮书%马宁
尚鵬鵬%張波萍%李敬鋒%趙立東%劉瑋書%馬寧
상붕붕%장파평%리경봉%조립동%류위서%마저
钛酸锶%溶胶-凝胶%放电等离子烧结%电传输性能
鈦痠鍶%溶膠-凝膠%放電等離子燒結%電傳輸性能
태산송%용효-응효%방전등리자소결%전전수성능
SrTiO_3%sol-gel%spark plasma sintering%electrical transport
利用溶胶凝胶(sol-gel)法和放电等离子烧结(SPS)制备了单相的钙钛矿结构La_xSr_(1-x)TiO_3 (0≤x≤0.15)块体材料,与传统的固相反应法相比,烧结温度大幅降低.在室温至679 K的温度范围内测量了La_xSr_(1-x)TiO_3 (0≤x≤0.15)的Seebeck系数和电导率,确定了最佳La掺杂量x=0.08.La_0.08Sr_0.92TiO_3在679 K时,最大功率因子PF=2.95 μWm~(-1)·K~(-2),随温度升高,PF增大趋势明显,表明在高温环境中可具有更大的PF.
利用溶膠凝膠(sol-gel)法和放電等離子燒結(SPS)製備瞭單相的鈣鈦礦結構La_xSr_(1-x)TiO_3 (0≤x≤0.15)塊體材料,與傳統的固相反應法相比,燒結溫度大幅降低.在室溫至679 K的溫度範圍內測量瞭La_xSr_(1-x)TiO_3 (0≤x≤0.15)的Seebeck繫數和電導率,確定瞭最佳La摻雜量x=0.08.La_0.08Sr_0.92TiO_3在679 K時,最大功率因子PF=2.95 μWm~(-1)·K~(-2),隨溫度升高,PF增大趨勢明顯,錶明在高溫環境中可具有更大的PF.
이용용효응효(sol-gel)법화방전등리자소결(SPS)제비료단상적개태광결구La_xSr_(1-x)TiO_3 (0≤x≤0.15)괴체재료,여전통적고상반응법상비,소결온도대폭강저.재실온지679 K적온도범위내측량료La_xSr_(1-x)TiO_3 (0≤x≤0.15)적Seebeck계수화전도솔,학정료최가La참잡량x=0.08.La_0.08Sr_0.92TiO_3재679 K시,최대공솔인자PF=2.95 μWm~(-1)·K~(-2),수온도승고,PF증대추세명현,표명재고온배경중가구유경대적PF.
The single phase perovskite La_xSr_(1-x)TiO_3 (0≤x≤0.15) ceramics were prepared by sol-gel process and spark plasma sintering (SPS). The thermal treating conditions were selected out through TG-DTA analysis of the drying gel. The phase structures of ceramics were studied with X-ray diffraction (XRD). The size and distribution of grains were tested by scanning electron microscopy (SEM). Sintering temperature of the as-prepared samples was significantly decreased compared with conventional solid-state reactions. Seebeck coefficient and electrical conductivity were measured from room temperature to 679 K. The optimal lanthanum doping content x was 0.08 mol, with which the La_0.08Sr_0.92TiO_3 sample shows the maximum power factor (PF) of 2.95 μW·m~(-1)·K~(-2) at 679 K. The larger PF would be obtained at higher measuring temperature.