High-thermoelectric performance of TiO_(2-x)fabricated under high pressure at high temperatures  

作　　者：Haiqiang Liu Hongan Ma Taichao Su Yuewen Zhang Bing Sun Binwu Liu Lingjiao Kong Baomin Liu Xiaopeng Jia 

机构地区：[1]State Key Laboratory of Superhard Materials,Jilin University,Changchun 130012,China [2]School of Materials Science and Engineering,Henan Polytechnic University,Jiaozuo 454000,China

出　　处：《Journal of Materiomics》2017年第4期286-292,共7页无机材料学学报（英文）

基　　金：This work was supported by the National Natural Science Foundation of China(Grant No.51171070);the Project of Jilin Science and Technology Development Plan(20170101045JC);Graduate Innovation Fund of Jilin University(Project No.2016065).

摘　　要：We present the work about the initiative fabrication of multi-scale hierarchical TiO2-x by our strategy,combining high pressure and high temperature(HPHT)reactive sintering with appropriate ratio of coarse Ti to nanosized TiO_(2).Ubiquitous lattice defects engineering has also been achieved in our samples by HPHT.The thermoelectric performance was significantly enhanced,and rather low thermal conductivity(1.60 W m^(-1)K^(-1))for titanium oxide was reported here for TiO1.76.Correspondingly,a high dimensionless figure of merit(zT)up to 0.33 at 700℃was realized in it.As far as we know,this value is an enhancement of 43%of the ever best result about nonstoichiometric TiO_(2)and the result is also exciting for oxide thermoelectric materials.The moderate power factor,the significantly reduced thermal conductivity and the remarkable synergy between electrical properties and thermal conductivity are responsible for the excellent thermoelectric performance.We develop a facile strategy for preparing multi-scale hierarchical TiO_(2-x)and its superior ability to optimize thermoelectric performance has been demonstrated here.

关 键 词：High pressure High temperature MULTI-SCALE TiO_(2-x) THERMOELECTRIC Integrated phonon scattering 

分 类 号：TB3[一般工业技术—材料科学与工程]