W掺杂对Zn0.98Al0.02O陶瓷热电性能的影响

doi:10.11896/cldb.18030250

材料导报

2019, Vol. 33

Issue (12): 1959-1962 https://doi.org/10.11896/cldb.18030250

无机非金属及其复合材料

W掺杂对Zn_0.98Al_0.02O陶瓷热电性能的影响

李怀明, 孙秋, 宋英

哈尔滨工业大学化工与化学学院,哈尔滨 150001

Effect of W Doping on Thermoelectric Properties of Zn_0.98Al_0.02O Ceramics

LI Huaiming, SUN Qiu, SONG Ying

School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001

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摘要采用溶胶-凝胶法合成了Zn_0.98-xAl_0.02W_xO (x=0、 0.005、 0.01、 0.02)前驱粉体,在1 400 ℃、N₂氛围下烧结5 h将其煅烧成块状陶瓷。通过XRD和SEM对样品的组成和形貌进行表征,并研究了W掺杂对Zn_0.98Al_0.02O陶瓷热电性能的影响。热电测试结果表明:材料的塞贝克系数绝对值|S|随W的掺入量的增加而先减小后增大,电导率则呈现相反的变化趋势。773 K时,x=0.005样品的功率因子最大,达到3.6×10^-4 W/(m·K),比Zn_0.98Al_0.02O提高了2倍。此外,W的掺杂有效降低了材料的热导率。773 K时,x=0.005样品的无量纲优值(ZT值)达到最大,为0.03,比Zn_0.98Al_0.02O提高了2.3倍。

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关键词: Zn_0.98Al_0.02O陶瓷热电性能氧化锌 W掺杂

Abstract: Zn_0.98-xAl_0.02W_xO (x=0, 0.005, 0.01, 0.02) precursor powders were synthesized via a sol-gel method and their ceramics were prepared for 5 h at 1 400 ℃ in N₂ atmosphere. The phase composition and microstructure of the samples were characterized by XRD and SEM. The effects of W doping on the thermoelectric properties of Zn_0.98Al_0.02O ceramics were investigated. The absolute value of the Seebeck coefficient of the material decreased first and then increased with the increase of the amount of W, and the conductivity showed an opposite trend. The sample with x=0.005 showed the highest power factor of 3.6×10^-4 W/(m·K) at 773 K, which is twice higher than Zn_0.98Al_0.02O. In addition, the doping of W effectively reduced the thermal conductivity. The highest ZT of 0.03 was obtained by x=0.005 sample at 773 K, which was 2.3 times higher than Zn_0.98Al_0.02O.

Key words: Zn_0.98Al_0.02O ceramics thermoelectric property zinc oxide W doping

发布日期: 2019-05-31

ZTFLH:

TB321

通讯作者: songy@hit.edu.cn

作者简介: 李怀明,2018年7月毕业于哈尔滨工业大学化工与化学学院,获得工程硕士学位。于2016年9月至2018年7月在哈尔滨工业大学化工与化学学院学习,主要研究方向为氧化物热电陶瓷。宋英,哈尔滨工业大学化工与化学学院,博导,教授。2000年毕业于哈尔滨工业大学,材料学博士学位。主要从事于氧化物热电陶瓷材料和信息功能陶瓷材料的研究。近5年,先后承担和参与国家自然科学基金及省重点基金、省市攻关项目等省部级课题7项;作为第一、二作者发表核心以上论文26篇(SCI检索11篇,EI检索15篇)。申请发明专利8项,作为第一发明人,获国家发明专利授权6项。

引用本文:

李怀明, 孙秋, 宋英. W掺杂对Zn_0.98Al_0.02O陶瓷热电性能的影响[J]. 材料导报, 2019, 33(12): 1959-1962.
LI Huaiming, SUN Qiu, SONG Ying. Effect of W Doping on Thermoelectric Properties of Zn_0.98Al_0.02O Ceramics. Materials Reports, 2019, 33(12): 1959-1962.

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http://www.mater-rep.com/CN/10.11896/cldb.18030250 或 http://www.mater-rep.com/CN/Y2019/V33/I12/1959

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