CN115072671A - 一种锗铋碲基热电材料及其制备方法 - Google Patents
一种锗铋碲基热电材料及其制备方法 Download PDFInfo
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- 239000000463 material Substances 0.000 title claims abstract description 59
- 229910052714 tellurium Inorganic materials 0.000 title claims abstract description 21
- 238000002360 preparation method Methods 0.000 title claims abstract description 18
- PORWMNRCUJJQNO-UHFFFAOYSA-N tellurium atom Chemical compound [Te] PORWMNRCUJJQNO-UHFFFAOYSA-N 0.000 title claims abstract description 17
- CWCCJSTUDNHIKB-UHFFFAOYSA-N $l^{2}-bismuthanylidenegermanium Chemical compound [Bi]=[Ge] CWCCJSTUDNHIKB-UHFFFAOYSA-N 0.000 title claims description 6
- 229910052797 bismuth Inorganic materials 0.000 claims abstract description 14
- 229910052732 germanium Inorganic materials 0.000 claims abstract description 11
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 claims abstract description 10
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000000126 substance Substances 0.000 claims abstract description 8
- 150000001875 compounds Chemical class 0.000 claims abstract description 7
- 238000005245 sintering Methods 0.000 claims description 33
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- 238000010791 quenching Methods 0.000 claims description 15
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- 229910052782 aluminium Inorganic materials 0.000 claims description 2
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- 229910052733 gallium Inorganic materials 0.000 claims description 2
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- 238000010309 melting process Methods 0.000 claims description 2
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- 239000002184 metal Substances 0.000 claims description 2
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Abstract
本申请公开了一种锗铋碲基热电材料及其制备方法，所述锗铋碲基热电材料包括化学式GeAxBi2‑xTe4的化合物。本申请通过改变A、Bi的掺杂比例，特别是在掺杂Sb元素后，改变Bi和Sb的比例，能有效调控材料的载流子浓度，达到最佳范围，获得较大的功率因子。且得到的锗铋碲基热电材料为组织和性能分布均匀的单一相。
Description
技术领域
本申请涉及一种锗铋碲基热电材料及其制备方法，属于热电材料领域。
背景技术
随着社会经济的发展，有限的化石能源面临着即将枯竭的问题，因此人们转而探索新型的可再生能源，如风能、热能等，同时能源的存储、输运、转化等关键技术也吸引了高度的关注。在不断的探索与研究中，人们发现热电材料具有无噪音、污染少、系统体积小、适用温度广等优点，这些优势使得热电材料在各种民用与军事领域得到了广泛的应用。热电材料的热电性能衡量标准是ZT值，ZT＝S2σT/k，其中S为塞贝克系数，σ为电导率，T为绝对温度，κ为总热导率。理想的高ZT值热电材料需要较大的功率因数(PF＝S2σ)和较小的热导率。然而，由于这三个系数是相互耦合，提升ZT成为了一个很大的挑战。
目前热电材料的种类繁多，有低温区的Bi2Te3体系材料；高温区的硅锗合金；中温区的PbTe、SnTe基材料等，这些二元化合物都具有较高的ZT值。同时，这些二元化合物还可以形成一系列的三元化合物(ⅣTe)x(Ⅴ2Te3)y(Ⅳ＝Ge，Sn，Pb；Ⅴ＝Sb，Bi)，在它们之中，Ge-Sb-Te(GST)通常被用作相变储存材料而被人们熟知，类似的Ge-Bi-Te(GBT)基化合物被认为是良好的拓扑绝缘体，良好的拓扑绝缘体与热电材料之间有着密切的联系，如Bi2Te3。大多数关于GB(S)T的研究集中在薄膜以及其拓扑性质上，关于其热电性能系统性研究的报道较少。
发明内容
根据本申请的一个方面，提供了一种锗铋碲基热电材料及其制备方法，该热电材料通过元素的掺杂，并调控掺杂元素的比例，提高了锗铋碲基热电材料的热电性能。
所述锗铋碲基热电材料包括式I所示化学式的化合物；
GeAxBi2-xTe4 式I
其中，A元素为金属元素；
A元素选自IIIA族元素、VA族元素中的任意一种；
x的取值为：0＜x＜2.0。
可选地，所述IIIA族元素选自Al、Ga、In、Tl中的任意一种；
所述VA族元素选自As、Sb中的任意一种。
优选地，A元素选用Sb。
可选地，所述x的取值范围在0.5≤x≤1.5。
根据本申请的又一个方面，提供了锗铋碲基热电材料的制备方法，其特征在于，所述方法至少包括：
步骤1、将Ge源、A源、Bi源、Te源熔融、淬火，得到铸锭；
步骤2、对所述铸锭进行退火处理，得到前驱体；
步骤3、对所述前驱体进行烧结，得到所述锗铋碲基热电材料。
可选地，所述Ge源、Bi源、Te源独立选自各元素对应的单质原料；
A源选自A元素的单质、氯化物中的至少一种。
优选地，Ge源、Te源、A源、Bi源均采用单质，且纯度大于99.999％。
可选地，步骤1中，所述熔融条件为：
熔融温度700～1100℃，熔融时间为1～5h。
具体地，熔融温度的下限独立地选自700℃、750℃、800℃、850℃、900℃；熔融温度的上限独立地选自950℃、975℃、1000℃、1050℃、1100℃。
具体地，熔融时间可独立选自1h、2h、3h、4h、5h，或上述两点之间的任意数值。
可选地，所述熔融过程中，控制真空度为1～10Pa。
可选地，步骤1中，所述淬火条件为：
淬火温度20～25℃。
具体地，淬火温度独立地选自20℃、21℃、22℃、23℃、24℃、25℃，或上述两点之间的任意数值。
本申请对于淬火时间没有特别限定，本领域技术人员可根据所得铸锭的大小，淬火的要求等，选择淬火时间，比如仅几毫米规格的铸锭，放入冷水中，直接拿出即可实现淬火目的。
可选地，步骤2中，所述退火处理条件为：
退火温度550～650℃，退火时间为1～5天。
具体地，退火温度的下限独立地选自550℃、560℃、570℃、580℃、590℃；退火温度的上限独立地选自600℃、610℃、620℃、630℃、650℃。
具体地，退火时间可独立选自1天、1.5天、2天、2.5天、3天、3.5天、4天、4.5天、5天，或上述两点之间的任意数值。
可选地，步骤3中，所述烧结采用热压烧结。
可选地，所述烧结条件为：
烧结压力40～55Mpa，烧结温度400～550℃，烧结时间20～50min。
具体地，烧结压力的下限独立地选自40Mpa、42Mpa、44Mpa、45Mpa、47Mpa；烧结压力的上限独立地选自50Mpa、51Mpa、52Mpa、53Mpa、55Mpa。
具体地，烧结温度的下限独立地选自400℃、420℃、440℃、450℃、470℃；烧结温度的上限独立地选自500℃、520℃、530℃、540℃、550℃。
具体地，烧结时间可独立选自20min、25min、30min、35min、40min、45min、50min，或上述两点之间的任意数值。
本申请中，“Ge-Bi(Sb)-Te热电材料”，是指锗铋碲基热电材料中掺杂有一定比例的Sb，且Bi和Sb形成完全固溶体。
本申请能产生的有益效果包括：
1)本申请方法制备的得到的锗铋碲基热电材料，通过改变A、Bi的掺杂比例(即改变x的值)，特别是在掺杂Sb元素后，改变Bi和Sb的比例，能有效调控材料的载流子浓度，达到最佳范围，获得较大的功率因子。
2)本申请制备方法中，起始原料采用纯度大于99.999％的单质原料，保证最终得到的热电材料纯度更高，热电性能更优。
3)本申请制备得到锗铋碲基热电材料为组织和性能分布均匀的单一相。
4)本申请采用热压烧结法制备锗铋碲基热电材料，制备工艺、设备要求都较简单。
附图说明
图1是本申请实施例1、2制备所得热电材料的XRD图；
图2是本申请实施例1-4所得热电材料的功率因子随温度变化的关系图；
图3是本申请实施例1、2所得热电材料的热电优值随温度变化的关系图。
具体实施方式
下面结合实施例详述本申请，但本申请并不局限于这些实施例。
如无特别说明，本申请的实施例中的原料均通过商业途径购买。
本申请的实施例中分析方法如下：
利用X射线衍射仪(D8 Advance)进行样品的组成分析。
利用电学性能测试系统(ZEM-3)与激光热导仪(Netzsch LFA-457)进行材料的电性能和热性能分析。
根据本申请的一种实施方式，一种Ge-Bi(Sb)-Te基热电材料的制备方法，具体包括如下步骤：
(a)按一定的化学计量比称取Ge、Bi、Sb和Te混合料，加入洁净的石英玻璃管中，真空封管，然后依次进行熔炼、淬火。
(b)将上述材料在高温退火炉中进行550～650℃退火，退火时间为1～5d，退火完成后得到铸锭。将铸锭破碎，研磨过筛后得到粉末。
(c)将(b)中的粉末放入石墨模具中，在<1Pa真空，温度为400～550℃条件下进行烧结，烧结压力为40～55Mpa，热压时间为20～50min。烧结完成后取出样品，将样品磨成粉末进行XRD测试，将样品切割成3mm*3mm*10mm条状和10mm*10mm*1.5mm片状分别进行电输运性能和热输运性能的测试。
实施例1
GeBi2Te4样品的制备
制备方法具体如下：
(1)按化学计量比称取纯度为99.999％的Ge块(1.09克)、Bi块(6.26克)和Te粒(7.65克)混合。将混合物密封在直径为10mm的石英玻璃管中，保持10Pa以下的高真空度，采用乙炔焊枪封管。将石英玻璃管置于摇摆炉中在950℃熔炼摇摆1h，然后25℃冷水淬火，得到块体材料。
(2)将(1)中得到的块体材料在580℃条件下退火2d后，破碎石英管，研磨块体材料，并过125目筛后，得到GeBi2Te4粉末。
(3)将(2)中的得到的粉末放入石墨模具中，在<1Pa真空下，控制烧结温度为500℃，压力为50MPa，热压烧结30min。
实施例2
GeBi1.5Sb0.5Te4样品的制备
制备方法具体如下：
(1)按化学计量比称取纯度为99.999％的Ge块(1.14克)、Bi块(4.91克)、Sb块(0.95克)和Te粒(8.00克)混合。将混合物密封在直径为10mm的石英玻璃管中，保持10Pa以下的高真空度，采用乙炔焊枪封管。将石英玻璃管置于摇摆炉中在950℃熔炼摇摆1h，然后25℃冷水淬火，得到块体材料。
(2)将(1)中得到的块体材料在580℃条件下退火2d后，破碎石英管，研磨块体材料，并过125目筛后，得到GeBi1.5Sb0.5Te4粉末。
(3)将(2)中的得到的粉末放入石墨模具中，在<1Pa真空下，控制烧结温度为500℃，压力为50MPa，热压烧结30min。
实施例3
GeBiSbTe4样品的制备
制备方法具体如下：
(1)按化学计量比称取纯度为99.999％的Ge块(1.19克)、Bi块(3.43克)、Sb块(2.00克)和Te粒(8.38克)混合。将混合物密封在直径为10mm的石英玻璃管中，保持10Pa以下的高真空度，采用乙炔焊枪封管。将石英玻璃管置于摇摆炉中在950℃熔炼摇摆1h，然后25℃冷水淬火，得到块体材料。
(2)将(1)中得到的块体材料580℃条件下进行退火2d后，破碎石英管，研磨块体材料，并过125目筛后，得到GeBiSbTe4粉末。
(3)将(2)中的得到的粉末放入石墨模具中，在<1Pa真空下，控制烧结温度为500℃，压力为50MPa，热压烧结30min。
实施例4
GeBi0.5Sb1.5Te4样品的制备
制备方法具体如下：
(1)按化学计量比称纯度为99.999％的Ge块(1.25克)、Bi块(1.80克)Sb块(3.15克)和Te粒(8.80克)混合。将混合物密封在直径为10mm的石英玻璃管中，保持10Pa以下的高真空度，采用乙炔焊枪封管。将石英玻璃管置于摇摆炉中在950℃熔炼摇摆1h，然后25℃冷水淬火得到块体材料。
(2)将(1)中得到的块体材料在580℃条件下退火2d后，破碎石英管，研磨块体材料，并过125目筛后，得到GeBi0.5Sb1.5Te4粉末。
(3)将(2)中的得到的粉末放入石墨模具中，在<1Pa真空下，控制烧结温度为500℃，压力为50MPa，热压烧结30min。
实施例5
GeIn0.08Bi1.82Te4样品的制备
制备方法具体如下：
(1)按化学计量比称取纯度为99.999％的Ge块(1.00克)、Bi块(6.24克)In粒(0.14克)和Te粒(7.62克)混合。将混合物密封在直径为10mm的石英玻璃管中，保持10Pa以下的高真空度，采用乙炔焊枪封管。将石英玻璃管置于摇摆炉中在950℃熔炼摇摆2h，然后20℃冷水淬火，得到块体材料。
(2)将(1)中得到的块体材料580℃条件下进行退火3d后，破碎石英管，研磨块体材料，并过125目筛后，得到GeIn0.08Sb1.82Te4粉末。
(3)将(2)中的得到的粉末放入石墨模具中，在<1Pa真空下，控制烧结温度为450℃，压力为55MPa，热压烧结50min。
实施例5
将实施例1-4所得样品磨成粉末进行XRD测试，将样品切割成3mm*3mm*10mm条状和10mm*10mm*1.5mm片状分别进行电输运性能和热输运性能的测试。
采用X射线衍射仪对实施例1-4制得的热电材料进行检测，其中图1为是实施例1、实施例2得到的XRD图，从图中可以观察到，与标准卡片对比，实施例1、2与标准PDF卡片峰位对应，证明得到了单一的纯相热电材料，Sb掺杂后，形成了GeBi(Sb)Te相固熔体。
对实施例1-4所得样品制成的条状、片状样品分别经ZEM-3仪器与激光热导仪测试电性能跟热性能后，计算其功率因子和热电优值，由图2所示，相比于未掺杂Sb元素的材料，在Sb的固溶后，材料的功率因子得到进一步提升，但是随着固溶量的增加，功率因子又呈现下降趋势，最终结果显示最优Sb固熔比例的样品为实施例2，即GeBi1.5Sb0.5Te4。根据图3可知，实施例2样品的热电优值相对于实施例1有明显提升。
以上所述，仅是本申请的几个实施例，并非对本申请做任何形式的限制，虽然本申请以较佳实施例揭示如上，然而并非用以限制本申请，任何熟悉本专业的技术人员，在不脱离本申请技术方案的范围内，利用上述揭示的技术内容做出些许的变动或修饰均等同于等效实施案例，均属于技术方案范围内。
Claims (10)
1.一种锗铋碲基热电材料，其特征在于，所述锗铋碲基热电材料包括式I所示化学式的化合物；
GeAxBi2-xTe4 式I
其中，A元素为金属元素；
A元素选自IIIA族元素、VA族元素中的任意一种；
x的取值为：0＜x＜2.0。
2.根据权利要求1所述的锗铋碲基热电材料，其特征在于，所述IIIA族元素选自Al、Ga、In、Tl中的任意一种；
所述VA族元素选自As、Sb中的任意一种。
3.根据权利要求1所述的锗铋碲基热电材料，其特征在于，所述x的取值范围在0.5≤x≤1.5。
4.权利要求1-3任一项所述的锗铋碲基热电材料的制备方法，其特征在于，所述方法至少包括：
步骤1、将Ge源、A源、Bi源、Te源熔融、淬火，得到铸锭；
步骤2、对所述铸锭进行退火处理，得到前驱体；
步骤3、对所述前驱体进行烧结，得到所述锗铋碲基热电材料。
5.根据权利要求4所述的制备方法，其特征在于，步骤1中，所述Ge源、Bi源、Te源独立选自各元素对应的单质原料；
A源选自A元素的单质、氯化物中的至少一种。
6.根据权利要求4所述的制备方法，其特征在于，步骤1中，所述熔融条件为：
熔融温度700～1100℃，熔融时间为1～5h。
7.根据权利要求4所述的制备方法，其特征在于，步骤1中，所述熔融过程中，控制真空度为1～10Pa。
8.根据权利要求4所述的制备方法，其特征在于，步骤1中，所述淬火条件为：
淬火温度20～25℃。
9.根据权利要求4所述的制备方法，其特征在于，步骤2中，所述退火处理条件为：
退火温度550～650℃，退火时间为1～5天。
10.根据权利要求4所述的制备方法，其特征在于，步骤3中，所述烧结采用热压烧结；
优选地，所述烧结条件为：
烧结压力40～55Mpa，烧结温度400～550℃，烧结时间20～50min。
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