| Crystal structure,thermal expansion and electrical conductivity of Pr（Ga1-xCox）0.9Mg0.1O3-δ （x=0, 0.1, 0.2, 0.3） |
| |
| 引用本文： | 任志华,;闫柏军,;刘建华,;张家芸. Crystal structure,thermal expansion and electrical conductivity of Pr（Ga1-xCox）0.9Mg0.1O3-δ （x=0, 0.1, 0.2, 0.3）[J]. 中国稀土学报(英文版), 2008, 26(3): 331-336. DOI: 10.1016/S1002-0721(08)60090-3 |
| |
| 作者姓名： | 任志华, 闫柏军, 刘建华, 张家芸 |
| |
| 作者单位： | [1]Department of Physical Chemistry of Metallurgy, University of Science and Technology Beijing, Beijing 10083, China; [2]School of Chemical Engineering, Qingdao University of Science and Technology, Qingdao 266042, China |
| |
| 基金项目： | Project supported by the National Natural Science Foundation of China （50374008）.Acknowledgements： The authors would like to thank Mrs. Liu Guirong and Zhang Mei for taking XRD and DSC measurements, respectively. |
| |
| 摘 要： | Pr（Ga1-xCox）0.9Mg0.1O3-δ （x=0, 0.1, 0.2, 0.3） was synthesized using solid-state reaction technique to study the effects of Co doping on their structure and properties. Room and high temperature XRD, DSC and electrical conductivity measurement with D.C. four-probe technique were adopted in the study. The results indicated its orthorhombic-distorted perovskite structure at room temperature. PrGa0.9Mg0.1O3-δ maintained its orthorhombic-distorted structure between 298 and 1173 K. For Pr（Ga0.7Co0.3）0.9Mg0.1O3-δ, such structure existed below 873 K. From 873 to 1173 K, it possessed tetragonal structure. The transformation from orthorhombic to tetragonal structure at 873 K was of second order. The intrinsic volume thermal expansion of tetragonal structured Pr（Ga0.7Co0.3）0.9Mg0.1O3-δ Was about 50% higher than those of PrGa0.9Mg0.1O3-δ. The electrical conductivity increased with Co content. The activation energies of conduction for Pr（Ga1-xCox）0.9Mg0.1O3-δ are in range from 0.197 to 0.246 eV, much lower than 1.543 eV for PrGaO3.
|
| 关 键 词： | 镨元素 五倍子酸盐 钙钛矿 晶体 |
| 收稿时间： | 2007-06-27 |
Crystal structure, thermal expansion and electrical conductivity of Pr(Ga1-xCox)0.9Mg0.1O3-δ (x=0, 0.1, 0.2, 0.3) |
| |
| Zhihua REN, Baijun YAN, Jianhua LIU,Jiayun ZHANG,. Crystal structure, thermal expansion and electrical conductivity of Pr(Ga1-xCox)0.9Mg0.1O3-δ (x=0, 0.1, 0.2, 0.3)[J]. Journal of Rare Earths, 2008, 26(3): 331-336. DOI: 10.1016/S1002-0721(08)60090-3 |
| |
| Authors: | Zhihua REN Baijun YAN Jianhua LIU Jiayun ZHANG |
| |
| Affiliation: | aDepartment of Physical Chemistry of Metallurgy, University of Science and Technology Beijing, Beijing 10083, China;bSchool of Chemical Engineering, Qingdao University of Science and Technology, Qingdao 266042, China |
| |
| Abstract: | Pr(Ga1-xCox)0.9Mg0.1O3–δ(x=0, 0.1, 0.2, 0.3) was synthesized using solid-state reaction technique to study the effects of Co doping on their structure and properties. Room and high temperature XRD, DSC and electrical conductivity measurement with D.C. four-probe technique were adopted in the study. The results indicated its orthorhombic-distorted perovskite structure at room temperature. PrGa0.9Mg0.1O3–δ maintained its orthorhombic-distorted structure between 298 and 1173 K. For Pr(Ga0.7Co0.3)0.9Mg0.1O3–δ, such structure existed below 873 K. From 873 to 1173 K, it possessed tetragonal structure. The transformation from orthorhombic to tetragonal structure at 873 K was of second order. The intrinsic volume thermal expansion of tetragonal structured Pr(Ga0.7Co0.3) 0.9Mg0.1O3–δ was about 50% higher than those of PrGa0.9Mg0.1O3–δ. The electrical conductivity increased with Co content. The activation energies of conduction for Pr(Ga1–xCox)0.9Mg0.1O3–δ are in range from 0.197 to 0.246 eV, much lower than 1.543 eV for PrGaO3. |
| |
| Keywords: | praseodymium gallate perovskites electrical properties crystal structure thermal expansion rare earths |
| 本文献已被 维普 ScienceDirect 等数据库收录！ |
|
