Effect of high pressure sintering and annealing on microstructure and thermoelectric properties of n

来源 :自然科学进展(英文版) | 被引量 : 0次 | 上传用户:xuzhao123456
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
Bi2Te2.7Se0.3 of high performance doped with Gd bulk materials was prepared by a high pressure (6.0 GPa) sintering (HPS) method at 593 K, 633 K, 673 K and 693 K. The sample was then annealed for 36 h in a vacuum at 633 K. The phase composition, crystal structure and morphology of the sample were analyzed by X-ray diffraction and scanning electron microscopy. The electric conductivity, Seebeck coefficient, and thermal conductivity aspects of the sample were measured from 298 K to 473 K. The results show that high pressure sintering and the doping with Gd has a great effect on the crystal structure and the thermoelectric properties of the samples. The samples are consisted of nanoparticles before and after annealing, and these nanostructures have good stability at high temperature. HPS together with annealing can improve the TE properties of the sample by decreasing the thermal conductivity of the sample with nanostructures. The maximum ZT value of 0.74 was obtained at 423 K for the sample, which was sintered at 673 K and then annealed at 633 K for 36 h. Compared with the zone melting sample, it was increased by 85%at 423 K. Hence the temperature of the maximum of figure of merit was increased. The results can be applied to the field of thermoelectric power generation materials.
其他文献
近年来,我国电视机市场竞争日趋激烈。1990年四川长虹集团率先降价,引发了全国性的彩电价格大战。长虹、康佳、LG等几家实力雄厚的集团在激烈的市场竞争中崭露头角,电视机市场逐
民营企业融资难、融资贵,一直是社会关注的问题,也是困扰民营企业发展的老大难问题.为破解民营企业融资难、融资贵,为民营企业解困,从而激发市场活力,促进创新就业、推动高质
利用固体与分子经验电子理论(EET),计算了奥氏体及马氏体中含碳的质量分数ωc
用RF磁控溅射沉积的Fe-N磁性薄膜,饱和磁化强度比较高,但矫顽力太高,因而降低H_c成为Fe-N是否可以用于高密度磁记录的关键,在低功率200W下溅射沉积200um的薄膜,在250℃,12000
分析了马氏体相变表象晶体学W-L-R理论不适用于{225}_f马氏体转变的原因,并作了修正,结果表明,修正后的W-L-R理论较成功地预测了不同合金的{225}_f马氏体转变,惯习面的理论预
期刊
对修饰聚合物 -盐 -水液 -固萃取体系进行了讨论 ,综述了该体系在萃取分离金属离子与生物活性物质方面的应用 ,并展望其前景 . The modified polymer-salt-water liquid-sol
期刊
随着互联网金融的蓬勃兴起,大学生的金融消费需求也达到了前所未有的高度,以弹窗形式出现的金融广告比比皆是,其中不乏以“校园贷”以及以回租贷、求职贷、培训贷、创业贷为
随着科学技术的进步,玉米除作为粮食作物和基本的农副产品加工外,还被广泛应用在化工、医药和新型材料等行业,涉及的产品达到3000多个,它已经成为可再生资源产业链条最长和经
Though carbon dioxide is the main green house gas due to burning of fossil resource or miscellaneous chemical processes,we propose here that carbon dioxide be a
为探究吕家坨井田地质构造格局,根据钻孔勘探资料,采用分形理论和趋势面分析方法,研究了井田7