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La_2/3Ca_1/3MnO₃∶Ag_x多晶靶材的制备及其电输运性质

Preparation and Electrical Transport Property of Polycrystalline La_2/3Ca_1/3MnO₃∶Ag_x Composites

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【Author】 CAO Ming-gang~1,LIU Xiang~1,ZHANG Hui~1,SHANG Jie~1,DUAN Yun-biao~1,LAN Jun~1,ZHANG Shao-chun~1,ZHANG Peng-xiang~1,2(1.Institute of Advanced Materials for Photoelectronics,Kunming University of Science and Technology,Kunming 650051,China;2.Max-Planck-insitut für Festkrperfoschung,Heisenbergstr.D 70569,Stuttgart,Germany)

【机构】昆明理工大学光电子新材料研究所；德国马普固体物理所；

【摘要】采用固相反应法制备了不同Ag掺杂量的La2/3Ca1/3MnO3(LCMO)∶Agx(x为摩尔百分比,x=0.00、0.01、0.05、0.10、0.20、0.30、0.40)多晶靶材,XRD图谱显示所制备样品均为纯相的赝立方钙钛矿结构,并且随着Ag掺杂量的增加,a轴和b轴在0≤x≤0.40范围内有微小的涨落;另外R-T曲线显示,0≤x≤0.05时,金属-绝缘转变温度(Tp)开始升高很快,0.05<x≤0.40时逐渐变缓,最大值为192K,这比化学共沉淀法制备的多晶靶材(273K)低约80K,分析其原因可能是粉体粒度的不同所致。更多还原

【Abstract】 Ag-doped polycrystalline La₂/3Ca₁/3MnO₃（LCMO）∶Ag_x（x = 0.00,0.01,0.05,0.10,0.20,0.30,0.40） targets have been prepared by solid-phase sintering method.X-ray diffraction（XRD） patterns show that the samples have a pseudo-cubic perovskite structure.With the addition of Ag,there is a little change in a-axis and b-axis from x=0.00 to x= 0.40.In addition,R-T curves demonstrate that the metal-insulation transition temperatures（Tp） increases sharply for x<0.05,and then increases slowly for x=0.05-0.40.The maximum Tp is 192 K,which is 80 K lower than that made by chemical coprecipitation method.This may be explained by the influence of powder grain size on Tp.更多还原