Phase stability, crystal structure and thermoelectric properties of Cu doped AgSbTe2
文献类型：期刊论文
| 作者 | Zhang, H ; Luo, J ; Zhu, HT ; Liu, QL ; Liang, JK ; Rao, GH |
| 刊名 | ACTA PHYSICA SINICA
 |
| 出版日期 | 2012 |
| 卷号 | 61期号:8 |
| 关键词 | HIGH-TEMPERATURE HIGH FIGURE SYSTEM MERIT PERFORMANCE DIAGRAM GLASSES |
| ISSN号 | 1000-3290 |
| 通讯作者 | Zhang, H (reprint author), Univ Sci & Technol Beijing, Sch Mat Sci & Engn, State Key Lab Adv Met & Mat, Beijing 100083, Peoples R China. |
| 中文摘要 | CuxAg1-xSbTe2 samples with x = 0-0.3 are prepared by a combined process of melt-quenching and spark plasma sintering (SPS). X-ray powder diffraction (XRD) analysis indicates that single phase samples with the NaCl-type structure are obtained for the Cu-doped samples before SPS treatment, whereas a small quantity of Ag2Te impurities coexist with the main cubic phase for the sample without Cu. According to our thermoanalysis and XRD results, the substitution of Cu for Ag can effectively prevent the precipitation of Ag2Te, but this also leads to the presence of a minor amorphous phase in the melt-quenched sample. The amorphous phase crystallizes into Sb7Te metastable phase at about 540 K, which finally transforms into the stable Sb2Te3 compound. After the SPS treatment of the melt-quenched sample, the sample with x = 0.1 remains a single phase with the face-centered-cubic crystal structure, while Sb7Te and Sb2Te3 are precipitated as the second phases for the samples with x = 0.2 and 0.3, respectively. The electrical conductivity increases and the Seebeck coefficient decreases with the addition of Cu due to the existence of the second phase in the samples with x = 0.2 and 0.3. Accordingly, thermal conductivities also increase with the addition of Cu, leading to the reduced thermoelectric performance of the x = 0.2 and 0.3 samples. For the sample with x = 0.1, its power factor is comparable to that of the literature reported AgSbTe2 compound. As a result of so-called alloying effect, the phonon scattering effect is enhanced due to the partial replacement of Ag by Cu, leading to the reduced thermal conductivity of the x = 0.1 sample. Therefore, the Cu0.1Ag0.9SbTe2 sample exhibits the promising thermoelectric performance and a dimensionless thermoelectric figure of merit (ZT) value of 1 is achieved at 620 K. |
| 收录类别 | SCI |
| 资助信息 | National Natural Science Foundation of China [11144002]; State Key Development Program for Basic Research of China [2007CB925003]; Ministry of Education, China [309006] |
| 语种 | 中文 |
| 公开日期 | 2013-09-24 |
| 源URL | [http://ir.iphy.ac.cn/handle/311004/50809]  |
| 专题 | 物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文 |
| 推荐引用方式 GB/T 7714 | Zhang, H,Luo, J,Zhu, HT,et al. Phase stability, crystal structure and thermoelectric properties of Cu doped AgSbTe2[J]. ACTA PHYSICA SINICA,2012,61(8). |
| APA | Zhang, H,Luo, J,Zhu, HT,Liu, QL,Liang, JK,&Rao, GH.(2012).Phase stability, crystal structure and thermoelectric properties of Cu doped AgSbTe2.ACTA PHYSICA SINICA,61(8). |
| MLA | Zhang, H,et al."Phase stability, crystal structure and thermoelectric properties of Cu doped AgSbTe2".ACTA PHYSICA SINICA 61.8(2012). |
入库方式： OAI收割
来源：物理研究所
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