摘要
通过共沉淀法制备了Al掺杂的Zn O颗粒,并在其表面包覆了不同厚度的Ti O_2,得到了Zn_(0.98)Al_(0.02)O@Ti O_2纳米核/壳异质结构粉体,采用放电等离子体(SPS)烧结技术制备了热电陶瓷材料。结果表明,包覆Ti O_2之后,材料的电学和热学性能均得到调控,其中包覆15%Ti O_2的样品的功率因子在1023 K比未包覆样品提高了10%,而且其热导率在1023 K比未包覆样品降低了将近30%。由于电学和热学的同时优化,使最大ZT值由未包覆时的0.030提高到了包覆之后的0.043,提高了43%,表明氧化钛包覆氧化锌的核/壳结构是提高氧化锌热电性能的有效途径。
Al doped Zn O powders were fabricated by co-precipitation,and then coated with different quantity TiO_2,forming Zn_(0.98)Al_(0.02)O@TiO_2 core-shell heterogeneous structure,which was at last sintered to ceramics by SPS.The result shows that the electrical and thermal properties both are optimized with TiO_2 coating.The power factor of 15wt%TiO_2 coated sample improves by about 10%compared with that of the uncoated sample at 1023 K,and the thermal conductivity of 15 wt%TiO_2 coated sample declines by about 30%compared with that of the uncoated sample.As a result,the maximum ZT value is enhanced by about 43%from 0.030 of the uncoated sample to 0.043 of 15 wt%TiO_2 coated sample at 1023 K,which shows that the forming of Zn_(0.98)Al_(0.02)O@TiO_2 core-shell heterogeneous structure is an effective approach to enhance the thermoelectric properties of Zn O.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2018年第S1期108-112,共5页
Rare Metal Materials and Engineering
基金
国家自然科学基金(51672155
51532003)
中国博士后科学基金(2016M601020)
关键词
ZNO
核/壳结构
热电性能
ZnO
core-shell structure
thermoelectric properties
