Impact of Lanthanide Contraction on the Structure and Electric Transport Properties of the Nano Powder by Doping with (La0.8Ln0.2)2/3Ca1/3MnO3
HE Ning1,2, LI Qinglun2, QI Yang2, ZHANG Caibei2
1. College of Basic Medical Science, China Medical University, Shenyang 110001, China;2. Key Laboratory for Anisotropy and Texture of Materials, Ministry of Education, Northeastern University, Shenyang 110819, China
Abstract:A series of doping (La0.8Ln0.2)2/3Ca1/3MnO3 (Ln represents La, Ce, Pr, Nd, Sm, Eu, Gd, Dy, Ho, and Er, respectively) nanometer level crystals were prepared by using the sol-gel method with the same experiment conditions. It is shown that the average lattice constant and tolerance factor varies monotonically with the increase of atomic number of doping elements for the series of samples, the average lattice constant a is gradually decreased, the average lattice constant b is essentially unchanged, and the average lattice constant c is slightly reduced in general; tolerance factor t is gradually reduced in the range between 0.925 and 0.918, however with the lanthanide contraction of samples, the system remains the perovskite structure. For samples with different doping elements, there is a big discrepancy in the surface morphology and electric transport properties of samples; the distribution of each particle sizes is from 30 nm to 800nm and the transition temperature is from 82K to 194K. At zero field, the transition temperature Tc for the cerium-team (La, Ce, Pr, Nd, Sm, and Eu) doping samples does not exhibit a monotonic changes, while its behavior changes from metallic state to insulated state with the increase of atomic number; and Tc for the yttrium-team (Gd, Dy, Ho, and Er) doping samples increases with the increase of atomic number and is in accordance with the monotony of lanthanide contraction.
何宁;李庆伦;祁阳;张彩碚. 镧系收缩对(La0.8Ln0.2)2/3Ca1/3MnO3纳米粉体结构和电输运性质的影响[J]. , 2013, 31(9): 18-22.
HE Ning;LI Qinglun;QI Yang;ZHANG Caibei. Impact of Lanthanide Contraction on the Structure and Electric Transport Properties of the Nano Powder by Doping with (La0.8Ln0.2)2/3Ca1/3MnO3. , 2013, 31(9): 18-22.