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

doi:10.1016/j.jallcom.2005.02.046

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 journal › Article › peer-review

1 Citation (Scopus)

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 language	English
Pages (from-to)	86-91
Number of pages	6
Journal	Journal of Alloys and Compounds
Volume	399
Issue number	1-2
DOIs	https://doi.org/10.1016/j.jallcom.2005.02.046
Publication status	Published - Aug 16 2005
Externally published	Yes

All Science Journal Classification (ASJC) codes

Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

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10.1016/j.jallcom.2005.02.046

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@article{69dc9bba0a434ab995f6942706920ef9,

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

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.",

author = "Li, \{H. W.\} and K. Ishikawa and K. Aoki",

note = "Funding Information: This work was supported in part by a “Grant-in-Aid” for Scientific Research on Priority Area A of “New Protium Function” from the Ministry of Education, Culture, Sports, Science, and Technology.",

year = "2005",

month = aug,

day = "16",

doi = "10.1016/j.jallcom.2005.02.046",

language = "English",

volume = "399",

pages = "86--91",

journal = "Journal of Alloys and Compounds",

issn = "0925-8388",

publisher = "Elsevier BV",

number = "1-2",

}

TY - JOUR

T1 - Hydrogen pressure dependence of structural changes in C15 Laves phase DyMn 2 studied by pressure differential scanning calorimetry

AU - Li, H. W.

AU - Ishikawa, K.

AU - Aoki, K.

N1 - Funding Information: This work was supported in part by a “Grant-in-Aid” for Scientific Research on Priority Area A of “New Protium Function” from the Ministry of Education, Culture, Sports, Science, and Technology.

PY - 2005/8/16

Y1 - 2005/8/16

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.

UR - https://www.scopus.com/pages/publications/21344445000

UR - https://www.scopus.com/pages/publications/21344445000#tab=citedBy

U2 - 10.1016/j.jallcom.2005.02.046

DO - 10.1016/j.jallcom.2005.02.046

M3 - Article

AN - SCOPUS:21344445000

SN - 0925-8388

VL - 399

SP - 86

EP - 91

JO - Journal of Alloys and Compounds

JF - Journal of Alloys and Compounds

IS - 1-2

ER -

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

Abstract

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