## 抄録

A partially Fe-substituted solid solution of a higher manganese silicide, (Mn_{1-x}Fe_{x} )Siγ , has been prepared by means of arc-melting and a subsequent annealing process. According to the linear relationship between x and lattice parameters, the solid solution can be prepared up to x = 0:35. The compounds consist of two tetragonal subsystems of [Mn_{1-x}Fe_{x} ] and [Si], with an irrational c-axis ratio γ = c_{Mn}=c_{Si} ̃ 1:7. With increasing x from 0 to 0.35, equivalent to increase electron carriers, the a-axis and cMn-axis lengths gradually decrease, while the cSi-axis length linearly increases. On the basis of a valence electron counting rule, we expected that a transition from p-type to n-type would occur at x = 0:23 ± 0:05. This transition is experimentally confirmed at x ̃ 0:28; the n-type samples are prepared at 0:28 ≤ x ≤ 0:35. The electrical conductivity at room temperature exhibits symmetrical curves versus x for both p- and n-type samples. However, the solubility limit of Fe appears to suppress any further increase in carrier concentration, resulting in poor electrical conductivity for n-type samples. As a consequence, the maximum dimensionless figure-of-merit ZT = 0:071 at 644 K is obtained for a sample with x = 0:30.

本文言語 | 英語 |
---|---|

論文番号 | 035804 |

ジャーナル | Japanese journal of applied physics |

巻 | 50 |

号 | 3 |

DOI | |

出版ステータス | 出版済み - 3月 2011 |

外部発表 | はい |

## !!!All Science Journal Classification (ASJC) codes

- 工学（全般）
- 物理学および天文学（全般）

## フィンガープリント

「Preparation and thermoelectric properties of a chimney-ladder (Mn_{1-x}Fex )Si

_{y}(y ̃ 1:7) solid solution」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。