Diffusion of Nb in Nb-H alloys

Yoshihiro Yamazaki, Takahiro Iida, Yoshiaki Iijima, Yuh Fukai

Research output: Contribution to journalArticle

Abstract

Self-diffusion coefficient of 95Nb in NbHx alloys (x=0.05, 0.25 and 0.3) has been determined in the temperature range from 823 to 1323 K by using a serial sputter-microsectioning technique. The self-diffusion coefficient of Nb in the NbHx alloys are larger than that in Nb, suggesting that vacancies are formed by hydrogen dissolution, that is, the formation of hydrogen-induced vacancies. The value of the pre-exponential factor for the Nb diffusion in the NbH0.05 alloy is five times larger than that in Nb, while the difference in the activation energies between the NbH 0.05 alloy and pure Nb is small. The self-diffusion enhancement in the NbH0.05 alloy is mainly caused by lowering in vibrational frequencies of atoms in the immediate neighborhood of hydrogen-induced vacancies.

Original languageEnglish
Pages (from-to)346-351
Number of pages6
JournalDefect and Diffusion Forum
Volume237-240
Issue numberPART 1
Publication statusPublished - Jan 1 2005

Fingerprint

Vacancies
Hydrogen
hydrogen
diffusion coefficient
Vibrational spectra
dissolving
Dissolution
Activation energy
activation energy
Atoms
augmentation
atoms
Temperature
temperature

All Science Journal Classification (ASJC) codes

  • Radiation
  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Yamazaki, Y., Iida, T., Iijima, Y., & Fukai, Y. (2005). Diffusion of Nb in Nb-H alloys. Defect and Diffusion Forum, 237-240(PART 1), 346-351.

Diffusion of Nb in Nb-H alloys. / Yamazaki, Yoshihiro; Iida, Takahiro; Iijima, Yoshiaki; Fukai, Yuh.

In: Defect and Diffusion Forum, Vol. 237-240, No. PART 1, 01.01.2005, p. 346-351.

Research output: Contribution to journalArticle

Yamazaki, Y, Iida, T, Iijima, Y & Fukai, Y 2005, 'Diffusion of Nb in Nb-H alloys', Defect and Diffusion Forum, vol. 237-240, no. PART 1, pp. 346-351.
Yamazaki Y, Iida T, Iijima Y, Fukai Y. Diffusion of Nb in Nb-H alloys. Defect and Diffusion Forum. 2005 Jan 1;237-240(PART 1):346-351.
Yamazaki, Yoshihiro ; Iida, Takahiro ; Iijima, Yoshiaki ; Fukai, Yuh. / Diffusion of Nb in Nb-H alloys. In: Defect and Diffusion Forum. 2005 ; Vol. 237-240, No. PART 1. pp. 346-351.
@article{6c0405a7af6d40d3b345e6cce837ae29,
title = "Diffusion of Nb in Nb-H alloys",
abstract = "Self-diffusion coefficient of 95Nb in NbHx alloys (x=0.05, 0.25 and 0.3) has been determined in the temperature range from 823 to 1323 K by using a serial sputter-microsectioning technique. The self-diffusion coefficient of Nb in the NbHx alloys are larger than that in Nb, suggesting that vacancies are formed by hydrogen dissolution, that is, the formation of hydrogen-induced vacancies. The value of the pre-exponential factor for the Nb diffusion in the NbH0.05 alloy is five times larger than that in Nb, while the difference in the activation energies between the NbH 0.05 alloy and pure Nb is small. The self-diffusion enhancement in the NbH0.05 alloy is mainly caused by lowering in vibrational frequencies of atoms in the immediate neighborhood of hydrogen-induced vacancies.",
author = "Yoshihiro Yamazaki and Takahiro Iida and Yoshiaki Iijima and Yuh Fukai",
year = "2005",
month = "1",
day = "1",
language = "English",
volume = "237-240",
pages = "346--351",
journal = "Defect and Diffusion Forum",
issn = "1012-0386",
publisher = "Trans Tech Publications",
number = "PART 1",

}

TY - JOUR

T1 - Diffusion of Nb in Nb-H alloys

AU - Yamazaki, Yoshihiro

AU - Iida, Takahiro

AU - Iijima, Yoshiaki

AU - Fukai, Yuh

PY - 2005/1/1

Y1 - 2005/1/1

N2 - Self-diffusion coefficient of 95Nb in NbHx alloys (x=0.05, 0.25 and 0.3) has been determined in the temperature range from 823 to 1323 K by using a serial sputter-microsectioning technique. The self-diffusion coefficient of Nb in the NbHx alloys are larger than that in Nb, suggesting that vacancies are formed by hydrogen dissolution, that is, the formation of hydrogen-induced vacancies. The value of the pre-exponential factor for the Nb diffusion in the NbH0.05 alloy is five times larger than that in Nb, while the difference in the activation energies between the NbH 0.05 alloy and pure Nb is small. The self-diffusion enhancement in the NbH0.05 alloy is mainly caused by lowering in vibrational frequencies of atoms in the immediate neighborhood of hydrogen-induced vacancies.

AB - Self-diffusion coefficient of 95Nb in NbHx alloys (x=0.05, 0.25 and 0.3) has been determined in the temperature range from 823 to 1323 K by using a serial sputter-microsectioning technique. The self-diffusion coefficient of Nb in the NbHx alloys are larger than that in Nb, suggesting that vacancies are formed by hydrogen dissolution, that is, the formation of hydrogen-induced vacancies. The value of the pre-exponential factor for the Nb diffusion in the NbH0.05 alloy is five times larger than that in Nb, while the difference in the activation energies between the NbH 0.05 alloy and pure Nb is small. The self-diffusion enhancement in the NbH0.05 alloy is mainly caused by lowering in vibrational frequencies of atoms in the immediate neighborhood of hydrogen-induced vacancies.

UR - http://www.scopus.com/inward/record.url?scp=30844449240&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=30844449240&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:30844449240

VL - 237-240

SP - 346

EP - 351

JO - Defect and Diffusion Forum

JF - Defect and Diffusion Forum

SN - 1012-0386

IS - PART 1

ER -