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首页> 外文期刊>Journal of Materials Research >Crystal structure and thermoelectric properties of the incommensurate chimney-ladder compound RhGe_γ (γ ～ 1.293)
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Crystal structure and thermoelectric properties of the incommensurate chimney-ladder compound RhGe_γ (γ ～ 1.293)

机译：不相称的烟梯化合物RhGe_γ（γ〜1.293）的晶体结构和热电性能

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摘要

The (3 + 1)-dimensional crystal structure of the Nowotny chimney-ladder compound Rh_(17)Ge_(22) was revealed using powder x-ray diffraction technique. As in the case of the higher manganese silicide MnSi_γ (known as Mn_(11)Si_(19), etc.), this germanide consists of two tetragonal subsystems of [Rh] and [Ge] with an irrational c-axis ratio γ = C_(Rh)/C_(Ge), and hence the structural formula can be represented as RhGe_γ As expected from first-principles calculations of the approximate structure and the valence electron count, n-type (negative Seebeck coefficient) conduction was experimentally confirmed over the whole temperature range of 333-984 K. Although the absolute value of the Seebeck coefficient was limited to |S| ≤ 53 μV/K, a high electrical conductivity (σ = 4.8 × 10~3 S/cm) yielded a reasonable power factor of S~2σ ～ 1 mW/K~2 m above 600 K. A maximum dimensionless figure-of-merit of ～0.1 at 900 K was expected using thermal conductivity data of a sintered pellet.
机译：使用粉末X射线衍射技术揭示了诺沃特尼烟囱梯化合物Rh_（17）Ge_（22）的（3 +1）维晶体结构。与高锰硅化物MnSi_γ（称为Mn_（11）Si_（19）等）一样，该锗化物由两个[Rh]和[Ge]的四边形子系统组成，其c轴比γ= C_（Rh）/ C_（Ge），因此结构式可以表示为RhGe_γ。根据近似结构和价电子数的第一性原理的计算，通过实验确定了n型（负塞贝克系数）传导尽管塞贝克系数的绝对值限制为| S |，但整个温度范围为333-984K。 ≤53μV/ K，高电导率（σ= 4.8×10〜3 S / cm）在600 K以上产生了合理的功率因数S〜2σ〜1 mW / K〜2 m。最大无因次图根据烧结球团的热导率数据，在900 K时预期〜0.1的优点。

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  • 来源
    《Journal of Materials Research》 |2015年第17期|2611-2617|共7页
  • 作者

    Yuzuru Miyazaki; Takaki Nakajo; Yuta Kikuchi; Kei Hayashi;

  • 作者单位

    Department of Applied Physics, Graduate School of Engineering, Tohoku University, Aoba-ku, Sendai 980-8579, Japan;

    Department of Applied Physics, Graduate School of Engineering, Tohoku University, Aoba-ku, Sendai 980-8579, Japan;

    Department of Applied Physics, Graduate School of Engineering, Tohoku University, Aoba-ku, Sendai 980-8579, Japan;

    Department of Applied Physics, Graduate School of Engineering, Tohoku University, Aoba-ku, Sendai 980-8579, Japan;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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