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.
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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 -