欢迎来到天天文库
浏览记录
ID:36815037
大小:2.81 MB
页数:60页
时间:2019-05-15
《铟掺杂β-Zn,4Sb,3热电材料的制备和电热输运性能》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、武汉理工大学硕士学位论文摘要JB-ZnaSb3是一种极具应用前景的P型中温热电材料。如何优化IB-Zn4Sb3化合物的热电性能是目前亟待解决的研究课题。本文采用传统工艺制备了名义组成为Zn4Sb3吖InX0~0.08,缸=o.02)的IIl掺杂13-Zn4Sb3基块体材料,发现所有IIl掺杂Zn4Sb3吖lm块体材料的ZT值均显著增大,Zn4Sb2.94Ino.06块体材料的ZT值700K时达到1.13。为了弄清h1杂质对B-zn4sb3热电材料的电热输运的影响及其规律,设计了名义组成为Zn4S
2、b3抽呶(03、p.Zn4Sb3块体材料相比,所有Zn4Sb3也热电材料的刀值均显著增大,其中ZruSb2.92Ino.08和ZmSb2引Ino.09块体材料700K时的刀值分别达到1.37和1.29,与纯B-zn4sb3块体材料700K时的z丁值(0.88)相比,分别提高了56%和47%。Zn位hl掺杂Zn4吖In,Sb3热电材料的Seebeck系数增大,晶格热导率减小。与纯p.ZmSb3块体材料相比,所有Zm吖hkSb3热电材料的ZT值均显著增大,其中Zn3185Ino.15Sb3和Zn3.82Ino.184、Sb3块体材料700K时的刀值分别达到1.28和1.41,与纯J3-Zn4Sb3块体材料700K时的刀值(O.84)相比,分别提高了52%和68%。空隙位hl掺杂Zn4Sb3Im热电材料的电导率变化不明显,但Seebeck系数增大,晶格热导率降低。与纯B.Zn4Sb3块体材料相比,所有111掺杂p-Zn4Sb3基块体材料的Z丁值均显著增大,其中Zn4Sb3Ino.06块体材料700K时的刀值达到1.02,与纯p.Zn4Sb3块体材料700K时的刀值(0.84)相比,提高了21%。关键词:IB-Z5、n4Sb3;In掺杂;显微结构;热电性能武汉理工大学硕士学位论文ABSTRACT13-Zn4Sb3hasbeenconsideredasolleofthemostpromisingp-typethermoelectricmaterialsinthemoderatetemperaturerange.Howtooptimizethethermoelectricpropertiesof[3-Zn4Sb3compoundisallurgentissue.Inthisthesis,aseriesofIn-6、doped13-ZmSb3-basedmaterialswithnominalcompositionofZn4Sb30取(0^旬.08,Ax=-0.02)werepreparedbytraditionalprocessing.ItisfoundthatZTvaluesoftheseIn-dopedp-ZmSb3一basedbulkmaterialsremarkablyenhancedandthehi【ghestZTvaluereaches1.13forZn4Sb2.94In0.06at700K.7、Inordertodemonstratetheeffectofhimpurityonthethermoelectricpropertiesofp-Zn4Sb3,threekindsofIn-dopedp-Zn4lb3一basedmaterialswithnominalcompositionofZmSb3瓤(㈣.12,Ax=-0.03),Zn4_xInxSb3(o-o.24,△x=O.03),andZmSb3Inx(㈣.08,Ax=-0.02)wereintentionallydesignedin8、mannersofoccupyingSbsite,Znsite,andintersticesiteswithIn,respectively.Threekindsofsingle-phaseandcrackfreeIll-dopedp-ZIl4Sb3-basedbulkmaterialshadbeensynthesizedbyemployingtheoptimizedvacuummeltingtimeandsparkplasmasinteringconditions.EmphasisWasplac
3、p.Zn4Sb3块体材料相比,所有Zn4Sb3也热电材料的刀值均显著增大,其中ZruSb2.92Ino.08和ZmSb2引Ino.09块体材料700K时的刀值分别达到1.37和1.29,与纯B-zn4sb3块体材料700K时的z丁值(0.88)相比,分别提高了56%和47%。Zn位hl掺杂Zn4吖In,Sb3热电材料的Seebeck系数增大,晶格热导率减小。与纯p.ZmSb3块体材料相比,所有Zm吖hkSb3热电材料的ZT值均显著增大,其中Zn3185Ino.15Sb3和Zn3.82Ino.18
4、Sb3块体材料700K时的刀值分别达到1.28和1.41,与纯J3-Zn4Sb3块体材料700K时的刀值(O.84)相比,分别提高了52%和68%。空隙位hl掺杂Zn4Sb3Im热电材料的电导率变化不明显,但Seebeck系数增大,晶格热导率降低。与纯B.Zn4Sb3块体材料相比,所有111掺杂p-Zn4Sb3基块体材料的Z丁值均显著增大,其中Zn4Sb3Ino.06块体材料700K时的刀值达到1.02,与纯p.Zn4Sb3块体材料700K时的刀值(0.84)相比,提高了21%。关键词:IB-Z
5、n4Sb3;In掺杂;显微结构;热电性能武汉理工大学硕士学位论文ABSTRACT13-Zn4Sb3hasbeenconsideredasolleofthemostpromisingp-typethermoelectricmaterialsinthemoderatetemperaturerange.Howtooptimizethethermoelectricpropertiesof[3-Zn4Sb3compoundisallurgentissue.Inthisthesis,aseriesofIn-
6、doped13-ZmSb3-basedmaterialswithnominalcompositionofZn4Sb30取(0^旬.08,Ax=-0.02)werepreparedbytraditionalprocessing.ItisfoundthatZTvaluesoftheseIn-dopedp-ZmSb3一basedbulkmaterialsremarkablyenhancedandthehi【ghestZTvaluereaches1.13forZn4Sb2.94In0.06at700K.
7、Inordertodemonstratetheeffectofhimpurityonthethermoelectricpropertiesofp-Zn4Sb3,threekindsofIn-dopedp-Zn4lb3一basedmaterialswithnominalcompositionofZmSb3瓤(㈣.12,Ax=-0.03),Zn4_xInxSb3(o-o.24,△x=O.03),andZmSb3Inx(㈣.08,Ax=-0.02)wereintentionallydesignedin
8、mannersofoccupyingSbsite,Znsite,andintersticesiteswithIn,respectively.Threekindsofsingle-phaseandcrackfreeIll-dopedp-ZIl4Sb3-basedbulkmaterialshadbeensynthesizedbyemployingtheoptimizedvacuummeltingtimeandsparkplasmasinteringconditions.EmphasisWasplac
此文档下载收益归作者所有