naa a22 4500 510803970 CHVBK 20180411083408.0 cr unu---uuuuu 180411e20130401xx s 000 0 eng 10.1007/s11664-012-2445-3 doi (NATIONALLICENCE)springer-10.1007/s11664-012-2445-3 Preparation, Structure, and Electrical Properties of Ca1− x Er x MnO3 Powders [Elektronische Daten] [Yunjiao Li, Sue Hao, Xue Xia, Jialin Xu, Xin Du, Siyu Fang, Xianwei Meng] To improve the electrical properties of modified CaMnO3 powders, we synthesized Ca1−x Er x MnO3 (CEM) (0≤x≤0.3) powders by sol-gel autocombustion technology. The effects of the Er-doping concentration on the structure and electrical properties of the powders were studied. The results show that Er-doping can decrease the resistivity of the CEM powders effectively and the variation of the resistivity presents a typical V-type with increasing Er-doping concentration. The resistivity reaches the lowest point of 0.5258Ωm at x=0.25. Meanwhile, the Ca0.75Er0.25MnO3 powder showed good frequency stability and higher conductivity at high temperatures. x-Ray diffraction (XRD) patterns and valence analysis illustrate that the grain size and average valence of the Mn ions, which relate to the resistivity of the CEM powders, are affected by the Er-doping concentration. When x=0.25, the average valence of the Mn ions reaches the lowest point of 3.576. Scanning electron microscopy (SEM) analysis demonstrates that higher Er-doping concentration leads to smaller grain size in the CEM powders. Er-doping restrains the growth of the powder particles while decreasing the porosity and increasing the unit cell volume, resulting in improvement of the electrical properties of the modified powders. TMS, 2013 CaMnO3 nationallicence rare earths nationallicence Er-doping nationallicence electrical properties nationallicence Li Yunjiao Department of Chemistry, Harbin Institute of Technology, 150001, Harbin, China aut Hao Sue Department of Chemistry, Harbin Institute of Technology, 150001, Harbin, China aut Xia Xue Department of Chemistry, Harbin Institute of Technology, 150001, Harbin, China aut Xu Jialin Department of Chemistry, Harbin Institute of Technology, 150001, Harbin, China aut Du Xin Department of Chemistry, Harbin Institute of Technology, 150001, Harbin, China aut Fang Siyu Department of Chemistry, Harbin Institute of Technology, 150001, Harbin, China aut Meng Xianwei Department of Chemistry, Harbin Institute of Technology, 150001, Harbin, China aut Journal of Electronic Materials Springer US; http://www.springer-ny.com 42/4(2013-04-01), 745-751 0361-5235 42:4<745 2013 42 11664 https://doi.org/10.1007/s11664-012-2445-3 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11664-012-2445-3 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Li Yunjiao Department of Chemistry, Harbin Institute of Technology, 150001, Harbin, China aut NATIONALLICENCE 700 1- Hao Sue Department of Chemistry, Harbin Institute of Technology, 150001, Harbin, China aut NATIONALLICENCE 700 1- Xia Xue Department of Chemistry, Harbin Institute of Technology, 150001, Harbin, China aut NATIONALLICENCE 700 1- Xu Jialin Department of Chemistry, Harbin Institute of Technology, 150001, Harbin, China aut NATIONALLICENCE 700 1- Du Xin Department of Chemistry, Harbin Institute of Technology, 150001, Harbin, China aut NATIONALLICENCE 700 1- Fang Siyu Department of Chemistry, Harbin Institute of Technology, 150001, Harbin, China aut NATIONALLICENCE 700 1- Meng Xianwei Department of Chemistry, Harbin Institute of Technology, 150001, Harbin, China aut NATIONALLICENCE 773 0- Journal of Electronic Materials Springer US; http://www.springer-ny.com 42/4(2013-04-01), 745-751 0361-5235 42:4<745 2013 42 11664 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer