Hydrogen pressure dependence of structural changes in C15 Laves phase DyMn2 studied by pressure differential scanning calorimetry

Haiwen Li, Kazuhiro Ishikawa, kiyoshi aoki

Research output: Contribution to journalArticle

Abstract

C15 Laves phase DyMn2 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 DyMn2Hx; (2) the simultaneous occurrence of hydrogen-induced amorphization (HIA) and the precipitation of DyH3 and (3) the decomposition of the amorphous hydride into DyH3 + α-Mn were observed independent of the hydrogen pressure. The peak temperature Tp for all reactions showed a negative pressure dependence, and no single-phase c- and a-DyMn2Hx were obtained under the present experimental conditions.
Original languageEnglish
Pages (from-to)86-91
JournalJournal of Alloys and Compounds
Volume399
DOIs
Publication statusPublished - 2005

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

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Hydrogen pressure dependence of structural changes in C15 Laves phase DyMn2 studied by pressure differential scanning calorimetry. / Li, Haiwen; Ishikawa, Kazuhiro; aoki, kiyoshi.

In: Journal of Alloys and Compounds, Vol. 399, 2005, p. 86-91.

Research output: Contribution to journalArticle

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abstract = "C15 Laves phase DyMn2 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 DyMn2Hx; (2) the simultaneous occurrence of hydrogen-induced amorphization (HIA) and the precipitation of DyH3 and (3) the decomposition of the amorphous hydride into DyH3 + α-Mn were observed independent of the hydrogen pressure. The peak temperature Tp for all reactions showed a negative pressure dependence, and no single-phase c- and a-DyMn2Hx were obtained under the present experimental conditions.",
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AB - C15 Laves phase DyMn2 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 DyMn2Hx; (2) the simultaneous occurrence of hydrogen-induced amorphization (HIA) and the precipitation of DyH3 and (3) the decomposition of the amorphous hydride into DyH3 + α-Mn were observed independent of the hydrogen pressure. The peak temperature Tp for all reactions showed a negative pressure dependence, and no single-phase c- and a-DyMn2Hx were obtained under the present experimental conditions.

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