Hydrogen pressure dependence of structural changes in C15 Laves phase DyMn 2 studied by pressure differential scanning calorimetry

H. W. Li, K. Ishikawa, K. Aoki

Research output: Contribution to journalArticle

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Abstract

C15 Laves phase DyMn 2 was thermally analyzed using a pressure differential scanning calorimeter (PDSC) in a hydrogen atmosphere between 0.1 and 5.0 MPa and its structural changes were investigated with a powder X-ray diffraction (XRD), a conventional differential scanning calorimeter in an argon atmosphere (Ar-DSC), a transmission electron microscope (TEM) and a hydrogen analyzer. Three exothermic peaks of (1) hydrogen absorption forming a crystalline (c-) and an amorphous (a-) hydride DyMn 2H x; (2) the simultaneous occurrence of hydrogen-induced amorphization (HIA) and the precipitation of DyH 3 and (3) the decomposition of the amorphous hydride into DyH 3 + α-Mn were observed independent of the hydrogen pressure. The peak temperature T p for all reactions showed a negative pressure dependence, and no single-phase c- and a-DyMn 2H x were obtained under the present experimental conditions.

Original languageEnglish
Pages (from-to)86-91
Number of pages6
JournalJournal of Alloys and Compounds
Volume399
Issue number1-2
DOIs
Publication statusPublished - Aug 16 2005
Externally publishedYes

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Hydrogen
Differential scanning calorimetry
Calorimeters
Hydrides
Scanning
Amorphization
Argon
X ray powder diffraction
Electron microscopes
Crystalline materials
Decomposition
Temperature

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

Cite this

Hydrogen pressure dependence of structural changes in C15 Laves phase DyMn 2 studied by pressure differential scanning calorimetry. / Li, H. W.; Ishikawa, K.; Aoki, K.

In: Journal of Alloys and Compounds, Vol. 399, No. 1-2, 16.08.2005, p. 86-91.

Research output: Contribution to journalArticle

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N2 - C15 Laves phase DyMn 2 was thermally analyzed using a pressure differential scanning calorimeter (PDSC) in a hydrogen atmosphere between 0.1 and 5.0 MPa and its structural changes were investigated with a powder X-ray diffraction (XRD), a conventional differential scanning calorimeter in an argon atmosphere (Ar-DSC), a transmission electron microscope (TEM) and a hydrogen analyzer. Three exothermic peaks of (1) hydrogen absorption forming a crystalline (c-) and an amorphous (a-) hydride DyMn 2H x; (2) the simultaneous occurrence of hydrogen-induced amorphization (HIA) and the precipitation of DyH 3 and (3) the decomposition of the amorphous hydride into DyH 3 + α-Mn were observed independent of the hydrogen pressure. The peak temperature T p for all reactions showed a negative pressure dependence, and no single-phase c- and a-DyMn 2H x were obtained under the present experimental conditions.

AB - C15 Laves phase DyMn 2 was thermally analyzed using a pressure differential scanning calorimeter (PDSC) in a hydrogen atmosphere between 0.1 and 5.0 MPa and its structural changes were investigated with a powder X-ray diffraction (XRD), a conventional differential scanning calorimeter in an argon atmosphere (Ar-DSC), a transmission electron microscope (TEM) and a hydrogen analyzer. Three exothermic peaks of (1) hydrogen absorption forming a crystalline (c-) and an amorphous (a-) hydride DyMn 2H x; (2) the simultaneous occurrence of hydrogen-induced amorphization (HIA) and the precipitation of DyH 3 and (3) the decomposition of the amorphous hydride into DyH 3 + α-Mn were observed independent of the hydrogen pressure. The peak temperature T p for all reactions showed a negative pressure dependence, and no single-phase c- and a-DyMn 2H x were obtained under the present experimental conditions.

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