Influence of Cr-doping on the magnetic and electrical transport properties of Nd0.75Na0.25MnO3
来源期刊：Journal of Rare Earths2011年第3期
论文作者：张兴华 李志青
文章页码：230 - 234
摘 要：Polycrystalline Nd0.75Na0.25Mn1-xCrxO3（0≤x≤0.1） samples were prepared by sol-gel method and their magnetic and electrical transport properties were investigated experimentally.The parent compound with x=0 was a charge ordered manganite and the charge ordering transition occurred at 170 K.For lower Cr concentration（x<0.03）,the samples preserved the charge ordering features of the parent compound,but the charge ordering transition temperature decreased with increasing x,in particular from 170 K for x=0 to 154 K for x=0.02.For the x≥0.03 samples,paramagnetic to ferromagnetic phase transition took place and the Curie temperature increased from 112.8 K for x=0.04 to 125.5 K for x=0.1.The electrical transport properties were also influenced by Cr doping.For x<0.03,the samples displayed insulator characteristics below 300 K.For x=0.04,the sample showed insulator-metal transition around 75 K.For x≥0.05,the insulator-metal transition disappeared and the compounds showed insulator features again.The magnetic and electrical properties could be well explained by the phase separation scenario.
张兴华1，李志青2
1. School of Materials Science and Engineering,Hebei University of Technology2. Tianjin Key Laboratory of Low Dimensional Materials Phys-ics and Preparing Technology,Tianjin University
摘 要：Polycrystalline Nd0.75Na0.25Mn1-xCrxO3（0≤x≤0.1） samples were prepared by sol-gel method and their magnetic and electrical transport properties were investigated experimentally.The parent compound with x=0 was a charge ordered manganite and the charge ordering transition occurred at 170 K.For lower Cr concentration（x<0.03）,the samples preserved the charge ordering features of the parent compound,but the charge ordering transition temperature decreased with increasing x,in particular from 170 K for x=0 to 154 K for x=0.02.For the x≥0.03 samples,paramagnetic to ferromagnetic phase transition took place and the Curie temperature increased from 112.8 K for x=0.04 to 125.5 K for x=0.1.The electrical transport properties were also influenced by Cr doping.For x<0.03,the samples displayed insulator characteristics below 300 K.For x=0.04,the sample showed insulator-metal transition around 75 K.For x≥0.05,the insulator-metal transition disappeared and the compounds showed insulator features again.The magnetic and electrical properties could be well explained by the phase separation scenario.
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