【摘要】 用自蔓延高温合成技术合成La0.67Sr0.33MnO3-δ粉体。探讨了放电等离子烧结的烧结温度对合成粉体的显微结构和输运性质的影响。扫描电镜和密度测试结果表明:放电等离子烧结后的晶粒大小均匀,烧结体致密度高。随着烧结温度的升高,样品的电阻率明显下降。由于氧缺位的存在,金属绝缘相转变温度随着烧结温度的升高而降低。相对于传统的固相烧结,放电等离子工艺制得的样品的致密度较高导致颗粒间的巨磁电阻有所提高。更多还原

【Abstract】 The powder of was synthesized by self-propagating high-temperature synthesis (SHS).The influences of the sintering temperature of spark plasma sintering(SPS) on the microstructure and the transport properties of the powder are discussed.The results of scanning electron microscope and the density test show that the sample produced by SPS has high density and a uniform grain size.The transition temperature of the metalinsulator decreases with the increase of the sintering temperature due to the deficiency of oxygen.Compared to the conventional sintering,the elevated colossal magnetoresistance between grains can be attributed to the high density of the sample by SPS.更多还原