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Mg掺杂n型Sn基Ⅷ型单晶笼合物的结构及电传输特性

孟代仪 申兰先 李德聪 晒旭霞 邓书康

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Mg掺杂n型Sn基Ⅷ型单晶笼合物的结构及电传输特性

孟代仪, 申兰先, 李德聪, 晒旭霞, 邓书康

Structural and electrical transport properties of Mg-doped n-type Sn-based type Ⅷ single crystalline clathrate

Meng Dai-Yi, Shen Lan-Xian, Li De-Cong, Shai Xu-Xia, Deng Shu-Kang
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  • 本文采用Sn自熔剂法,制备Mg掺杂Sn基单晶笼合物Ba8Ga16-XMgXSn30 (0 X 1.5),并对其结构及电传输性能进行研究. 结果表明所制备化合物为具有空间群I43 m的Ⅷ型单晶笼合物,随Mg掺杂量的增加,对应化合物的熔点略有升高,晶格常数减小,掺杂样品中填充原子Ba的实际含量低于理想值8.0,其在十二面体空洞中的占有率约为0.93(Mg的名义含量X=1.5时). 所有样品均表现为n型传导,Mg的掺入对材料的能带结构有一定影响,Mg掺杂后,样品的载流子浓度降低,Seebeck系数的绝对值、电阻率增加,Mg的名义含量X=1.5时,样品的功率因子在430 K附近取得最大值1.2610-3 Wm-1K-2.
    Mg-doped Sn-based single crystalline samples Ba8Ga16-XMgXSn30(0 X 1.5) were grown from Sn flux to characterize their structural and electrical transport properties. Research results show that the prepared compounds are well indexed by the type-Ⅷ clathrate structure with a space group I43 m. With the increase in Mg content, the melting point of the corresponding compounds increases. On the contrary, the lattice constant decreases. The actual content of filling atomic Ba in doped samples is below the ideal value of 8.0, the occupancy of Ba in the dodecahedron is about 0.93 for the sample with X=1.5. All the samples show n-type conduction. The Mg atoms have an effect on the band structure of the materials, and the carrier concentrations in the doped samples are reduced. However, the absolute values of Seebeck coefficient and the resistivity of doped compounds increase, respectively. By calculation, the sample of X=1.5 obtains the maximum value of power factor 1.2610-3 Wm-1K-2 near 430 K.
    • 基金项目: 国家自然科学基金研究项目(批准号:51262032)资助的课题.
    • Funds: Project supported by the National Natural Science Foundation of China (Grant No. 51262032).
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    [2]

    Deng S K, Saiga Y, Suekuni K, Takabatake T 2010 J. Appl. Phys. 108 073705

    [3]
    [4]

    Deng S K, Saiga Y, Kajisa K, Takabatake T 2011 J. Appl. Phys. 109 103704

    [5]
    [6]
    [7]

    Du B L, Saiga Y, Kajisa K, Takabatake T 2012 J. Appl. Phys. 111 013707

    [8]

    Deng S K, Li D C, Shen L X, Hao R T, Takabatake T 2012 Chin. Phys. B 21 017401

    [9]
    [10]
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    Slack G A 1995 Handbook of Thermoelectrics CRC 1995

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    CahilI D G, Watson S K, Pohl R O 1992 Phys. Rev. B 46 6131

    [13]
    [14]

    Avila M A, Suekuni K, Umeo K, Fukuoka H, Yamanaka S, Takabatake T 2006 Phys. Rev. B 74 125109

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    [16]

    Suekuni K, Avila M A, Umeo K, Fukuoka H, Yamanaka S, Nakagawa T, Takabatake T 2008 Phys. Rev. B 77 235119

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    [18]

    Sasaki Y, Kishimoto K, Koyanagi T, Asada H, Akai K 2009 Appl. Phys. Lett. 105 073702

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    [21]

    Bentien A, Pacheco V, Paschen S, Grin Y, Steglich F 2005 Phys. Rev. B 71 165206

    [22]
    [23]

    Phan M H, Woods G T, Chaturvedi A, Stefanoski S, Nolas G S, Srikant H 2008 Appl. Phys. Lett. 93 252505

    [24]

    Pacheco V, Bentien A, Carrillo-Cabrera W, Paschen S, Steglich F, Grin Y 2005 Phys. Rev. B 71 165205

    [25]
    [26]

    Kishimoto K, Ikeda N, Akai K, Koyanagi T 2008 Appl. Phys. Express 1 031201

    [27]
    [28]

    Chen Y X, Du B L, Saiga Y, Kajisa K, Takabatake T 2013 J. Appl. Phys. 46 205302

    [29]
    [30]

    Saiga Y, Suekuni K, Deng S K, Yamamoto T, Kono Y, Ohya N and Takabatake T 2010 J. Alloy. Compd. 507 1

    [31]
    [32]

    Deng S K 2008 Ph. D. Preparation (Hubei: Wuhan University of Technology) (in Chinese)[邓书康 2008 博士学位 (湖北: 武汉理工大学)]

    [33]
    [34]

    Kono Y, Akai K, Ohya1 N, Saiga Y, Suekuni K, Takabatake T, Yamamoto S 2012 Mater. Trans 53 636

    [35]
    [36]
    [37]

    Meng D Y, Shen L X, Shai X X, Dong G J, Deng S K 2013 Acta Phys. Sin. 62 247401

    [38]

    Carrillo C W, Budnyk S, Prots Y, Grin Y 2004 Anorg. Allg. Chem. 630 2267

    [39]
    [40]

    Zhao J, Buldum A, Lu J P 1999 Phys. Rev. B 60 14177

    [41]
    [42]
    [43]

    Zhao J T, Corbett J D 1994 Inorg. Chem. 33 5721

    [44]

    Blake N P, Latturner S, Bryan J D 2001 J. Chem. Phys. 115 8060

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出版历程
  • 收稿日期:  2014-04-15
  • 修回日期:  2014-04-30
  • 刊出日期:  2014-09-05

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