The investigation of the Zr1-yTiy(Cr1-xNix) 2-H2 system 0.0≤y≤1.0 and 0.0≤x≤1.0 Phase composition analysis and thermodynamic properties

M. Bououdina, H. Enoki, Etsuo Akiba

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

The Zr1-yTiy(Cr1-xNix)2 compounds were synthesized and characterized by means of X-ray powder diffraction. From the Rietveld analysis carried out on the alloys, we determined the phase abundancy and refined the crystal structure. The system crystallized with hexagonal C14-type structure for nickel content less than x=1.0 with some amount of additional phases (ZrNi, Zr9Ni11, Zr7Ni10, TiNi) and pure metals (Ni and Cr). For higher nickel concentrations, the system crystallized in the cubic C15-type structure. The amount of additional phases increased with increasing nickel and titanium content. The Pressure-Composition-Temperature measurements using a volumetric method were carried out at 313 K on some selected alloys. The single phase systems were found to absorb a large amount of hydrogen (H/M≤1.8 wt.%) but had very poor kinetics. The multiphase systems were found to behave as a single phase (presence of single plateau), have a relatively good hydrogen capacity (H/M≤1.4 wt.%) and exhibit faster kinetics. A linear correlation between the heat of formation of the Zr1-yTiy(Cr1-xNix)2 hydrides estimated from the band structure model and the unit cell volume of the alloys determined from the X-ray Rietveld analysis was obtained. It shows a decrease of hydride stability with increasing unit cell volume.

Original languageEnglish
Pages (from-to)290-300
Number of pages11
JournalJournal of Alloys and Compounds
Volume281
Issue number2
DOIs
Publication statusPublished - Dec 18 1998

Fingerprint

Nickel
Phase composition
Rietveld analysis
Thermodynamic properties
Hydrides
Hydrogen
Kinetics
Titanium
Temperature measurement
Band structure
X ray powder diffraction
Crystal structure
Metals
X rays
Chemical analysis

All Science Journal Classification (ASJC) codes

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

Cite this

The investigation of the Zr1-yTiy(Cr1-xNix) 2-H2 system 0.0≤y≤1.0 and 0.0≤x≤1.0 Phase composition analysis and thermodynamic properties. / Bououdina, M.; Enoki, H.; Akiba, Etsuo.

In: Journal of Alloys and Compounds, Vol. 281, No. 2, 18.12.1998, p. 290-300.

Research output: Contribution to journalArticle

@article{39dce8c62d084d8c9579015479830e9b,
title = "The investigation of the Zr1-yTiy(Cr1-xNix) 2-H2 system 0.0≤y≤1.0 and 0.0≤x≤1.0 Phase composition analysis and thermodynamic properties",
abstract = "The Zr1-yTiy(Cr1-xNix)2 compounds were synthesized and characterized by means of X-ray powder diffraction. From the Rietveld analysis carried out on the alloys, we determined the phase abundancy and refined the crystal structure. The system crystallized with hexagonal C14-type structure for nickel content less than x=1.0 with some amount of additional phases (ZrNi, Zr9Ni11, Zr7Ni10, TiNi) and pure metals (Ni and Cr). For higher nickel concentrations, the system crystallized in the cubic C15-type structure. The amount of additional phases increased with increasing nickel and titanium content. The Pressure-Composition-Temperature measurements using a volumetric method were carried out at 313 K on some selected alloys. The single phase systems were found to absorb a large amount of hydrogen (H/M≤1.8 wt.{\%}) but had very poor kinetics. The multiphase systems were found to behave as a single phase (presence of single plateau), have a relatively good hydrogen capacity (H/M≤1.4 wt.{\%}) and exhibit faster kinetics. A linear correlation between the heat of formation of the Zr1-yTiy(Cr1-xNix)2 hydrides estimated from the band structure model and the unit cell volume of the alloys determined from the X-ray Rietveld analysis was obtained. It shows a decrease of hydride stability with increasing unit cell volume.",
author = "M. Bououdina and H. Enoki and Etsuo Akiba",
year = "1998",
month = "12",
day = "18",
doi = "10.1016/S0925-8388(98)00792-0",
language = "English",
volume = "281",
pages = "290--300",
journal = "Journal of Alloys and Compounds",
issn = "0925-8388",
publisher = "Elsevier BV",
number = "2",

}

TY - JOUR

T1 - The investigation of the Zr1-yTiy(Cr1-xNix) 2-H2 system 0.0≤y≤1.0 and 0.0≤x≤1.0 Phase composition analysis and thermodynamic properties

AU - Bououdina, M.

AU - Enoki, H.

AU - Akiba, Etsuo

PY - 1998/12/18

Y1 - 1998/12/18

N2 - The Zr1-yTiy(Cr1-xNix)2 compounds were synthesized and characterized by means of X-ray powder diffraction. From the Rietveld analysis carried out on the alloys, we determined the phase abundancy and refined the crystal structure. The system crystallized with hexagonal C14-type structure for nickel content less than x=1.0 with some amount of additional phases (ZrNi, Zr9Ni11, Zr7Ni10, TiNi) and pure metals (Ni and Cr). For higher nickel concentrations, the system crystallized in the cubic C15-type structure. The amount of additional phases increased with increasing nickel and titanium content. The Pressure-Composition-Temperature measurements using a volumetric method were carried out at 313 K on some selected alloys. The single phase systems were found to absorb a large amount of hydrogen (H/M≤1.8 wt.%) but had very poor kinetics. The multiphase systems were found to behave as a single phase (presence of single plateau), have a relatively good hydrogen capacity (H/M≤1.4 wt.%) and exhibit faster kinetics. A linear correlation between the heat of formation of the Zr1-yTiy(Cr1-xNix)2 hydrides estimated from the band structure model and the unit cell volume of the alloys determined from the X-ray Rietveld analysis was obtained. It shows a decrease of hydride stability with increasing unit cell volume.

AB - The Zr1-yTiy(Cr1-xNix)2 compounds were synthesized and characterized by means of X-ray powder diffraction. From the Rietveld analysis carried out on the alloys, we determined the phase abundancy and refined the crystal structure. The system crystallized with hexagonal C14-type structure for nickel content less than x=1.0 with some amount of additional phases (ZrNi, Zr9Ni11, Zr7Ni10, TiNi) and pure metals (Ni and Cr). For higher nickel concentrations, the system crystallized in the cubic C15-type structure. The amount of additional phases increased with increasing nickel and titanium content. The Pressure-Composition-Temperature measurements using a volumetric method were carried out at 313 K on some selected alloys. The single phase systems were found to absorb a large amount of hydrogen (H/M≤1.8 wt.%) but had very poor kinetics. The multiphase systems were found to behave as a single phase (presence of single plateau), have a relatively good hydrogen capacity (H/M≤1.4 wt.%) and exhibit faster kinetics. A linear correlation between the heat of formation of the Zr1-yTiy(Cr1-xNix)2 hydrides estimated from the band structure model and the unit cell volume of the alloys determined from the X-ray Rietveld analysis was obtained. It shows a decrease of hydride stability with increasing unit cell volume.

UR - http://www.scopus.com/inward/record.url?scp=0032312393&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0032312393&partnerID=8YFLogxK

U2 - 10.1016/S0925-8388(98)00792-0

DO - 10.1016/S0925-8388(98)00792-0

M3 - Article

AN - SCOPUS:0032312393

VL - 281

SP - 290

EP - 300

JO - Journal of Alloys and Compounds

JF - Journal of Alloys and Compounds

SN - 0925-8388

IS - 2

ER -