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.
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.
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