### 抜粋

The growth process of RE123 (REBa _{2}Cu _{3}O _{7-x}, RE = Nd and Sm) crystals in the atmosphere of Ar-1%O _{2} were observed insitu to investigate the nucleation and growth process of faceted RE123 crystals from the liquid +422(Nd _{4}Ba _{2}Cu _{2}O _{10}) or 211 (Sm _{2}BaCuO _{5}) on MgO(100) substrate through a peritectic reaction by using high temperature optical microscope with zoom lens. The nucleated faceted 123 crystals grew at a rate depended on the undercooling (Δ T). Growth rate (u) and incubation time (t _{inc}) for nucleation were obtained from the changes in position of faceted interface during isothermal solidification. Growth rate u (m/s) was approximated by the following relation: u=A _{g} (Δ T _{r} ^{2}/η (T) ), where η (T) was the viscosity, Δ T= T _{p} - T, Δ T _{r}=ΔT/ T _{p}, T was temperature, T _{p} was peritectic temperature, A _{g} was a constant: A _{g} = 0.60×10 ^{6} for Nd and A _{g}=1.8×10 ^{-5} for Sm. Nucleation rate(I _{v}) was obtained from the relationship between the number of nucleated crystals(n) and time(t). I _{v}(m ^{-3} s ^{-1}) was approximated by I _{v}= A _{n}(1/η(r)) exp (-B/ΔT _{r} ^{2}), where A _{n} and 5 were constants: A _{n} = 3.5×10 ^{7}, B= 1.5 ×10 ^{-3} for Nd, and A _{n} = 12.5×10 ^{7}, B=3.2×10 ^{-3} for Sm.

元の言語 | 英語 |
---|---|

ページ（範囲） | 592-598 |

ページ数 | 7 |

ジャーナル | Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals |

巻 | 70 |

発行部数 | 7 |

DOI | |

出版物ステータス | 出版済み - 7 1 2006 |

### All Science Journal Classification (ASJC) codes

- Condensed Matter Physics
- Mechanics of Materials
- Metals and Alloys
- Materials Chemistry

## フィンガープリント In-situ observation and analysis of crystal growth process in NdBCO and SmBCO superconductive oxide' の研究トピックを掘り下げます。これらはともに一意のフィンガープリントを構成します。

## これを引用

*Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals*,

*70*(7), 592-598. https://doi.org/10.2320/jinstmet.70.592