Structure, magnetic, electrical and thermal transport properties of Dy-doped Ca3Co2O6 ceramics
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- 作者：J.Y. Songa ; b ; B.C. Zhaoa ; bchzhao@issp.ac.cn" class="auth_mail" title="E-mail the corresponding author ; Y.N. Huanga ; Y.F. Qina ; b ; X.B. Zhua ; W.H. Songa ; whsong@issp.ac.cn" class="auth_mail" title="E-mail the corresponding author ; Y.P. Suna ; c ; d
- 关键词：Dy doping ; Magnetic properties ; Electrical transport ; Thermopower
- 刊名：Ceramics International
- 出版年：2016
- 出版时间：15 May 2016
- 年：2016
- 卷：42
- 期：7
- 页码：8955-8961
- 全文大小：1778 K
文摘
The effects of Dy doping on the structure, magnetic, electrical and thermal transport properties of Ca3−xDyxCo2O6 (x =0–0.4) ceramics have been investigated. All samples show the rhombohedral structure with space group e06a7970223742a0">
ontainer hidden">. The lattice parameter c is found to increase whereas a decreases in the Dy-doped samples by the Rietveld refinement on the powder x-ray diffraction patterns. The magnetization at high temperatures increases slightly with increasing Dy-doping content, whereas the low-temperature magnetization decreases. The variations of the magnetization in the high- and low-temperature range are considered to be related to the paramagnetism of the doped Dy3+ ions and the weakened ferromagnetic (FM) interaction along the spin–chains, respectively. The resistivity decreases initially and then increases slightly with increasing Dy-doping level. The competition between the increased carrier concentration and the enhanced disorder in the Dy-doped samples may be the origin of the observed phenomenon. The low-temperature thermopower increases considerably in the Dy-doped samples, although its value has a decreasing trend at high temperatures. The result shows that the magnetic ion doping may be an effective method to tune the low-temperature thermoelectric properties of these spin–chain compounds.
ontainer hidden">. The lattice parameter c is found to increase whereas a decreases in the Dy-doped samples by the Rietveld refinement on the powder x-ray diffraction patterns. The magnetization at high temperatures increases slightly with increasing Dy-doping content, whereas the low-temperature magnetization decreases. The variations of the magnetization in the high- and low-temperature range are considered to be related to the paramagnetism of the doped Dy3+ ions and the weakened ferromagnetic (FM) interaction along the spin–chains, respectively. The resistivity decreases initially and then increases slightly with increasing Dy-doping level. The competition between the increased carrier concentration and the enhanced disorder in the Dy-doped samples may be the origin of the observed phenomenon. The low-temperature thermopower increases considerably in the Dy-doped samples, although its value has a decreasing trend at high temperatures. The result shows that the magnetic ion doping may be an effective method to tune the low-temperature thermoelectric properties of these spin–chain compounds.