Hydrogenation properties of ternary intermetallic compounds Mg 2-xPr xNi 4

N. Terashita, K. Sakaki, S. Tsunokake, Y. Nakamura, Etsuo Akiba

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Ternary intermetallic compounds, Mg 2-xPr xNi 4 (0.6 ≤ x ≤ 1.4) were synthesized by induction melting and investigated with respect to hydrogenation properties and structural changes. These compounds have a cubic C15 b-type Laves structure (space group F-43m), where Mg and Pr have an ordered arrangement. The lattice parameters increased from a = 0.70101(3)nm to a = 0.71726(8)nm with increase of the Pr content. Mg 1.4Pr 0.6Ni 4 and Mg 1.2Pr 0.8Ni 4 absorbed and desorbed hydrogen up to ∼0.7 H/M reversibly through one plateau in the p-c isotherms. The stoichiometric MgPrNi 4 showed two plateaus and its maximum hydrogen content reached to ∼1.0 H/M at 35MPa. The enthalpy changes of hydrides formation of Mg 1.4Pr 0.6Ni 4 and Mg 1.2Pr 0.8Ni 4 were estimated to be -39.2 and -40.3 kJ/mol H 2 respectively. The enthalpy changes of hydrides formation of MgPrNi 4 at the lower and higher plateaus were estimated to be -42.4 and -19.6 kJ/mol H 2 respectively. The metal sublattice of hydrides Mg 1.4Pr 0.6Ni 4H ∼4 and Mg 1.2Pr 0.8Ni 4H ∼4 had cubic ordered C15 b-type Laves structure same as the crystal structure before hydrogenation while hydride at the lower plateau of the stoichiometric MgPrNi 4 had an orthorhombic structure. The hydrogenation of Mg 0.8Pr 1.2Ni 4 and Mg 0.6Pr 1.4Ni 4 led to amorphization.

Original languageEnglish
Pages (from-to)513-517
Number of pages5
JournalMaterials Transactions
Volume53
Issue number3
DOIs
Publication statusPublished - Apr 5 2012

Fingerprint

Hydrides
Hydrogenation
hydrogenation
hydrides
Intermetallics
intermetallics
plateaus
Hydrogen
Enthalpy
enthalpy
Amorphization
hydrogen
sublattices
Lattice constants
Isotherms
lattice parameters
induction
isotherms
Melting
Crystal structure

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Terashita, N., Sakaki, K., Tsunokake, S., Nakamura, Y., & Akiba, E. (2012). Hydrogenation properties of ternary intermetallic compounds Mg 2-xPr xNi 4 Materials Transactions, 53(3), 513-517. https://doi.org/10.2320/matertrans.M2011334

Hydrogenation properties of ternary intermetallic compounds Mg 2-xPr xNi 4 . / Terashita, N.; Sakaki, K.; Tsunokake, S.; Nakamura, Y.; Akiba, Etsuo.

In: Materials Transactions, Vol. 53, No. 3, 05.04.2012, p. 513-517.

Research output: Contribution to journalArticle

Terashita, N, Sakaki, K, Tsunokake, S, Nakamura, Y & Akiba, E 2012, 'Hydrogenation properties of ternary intermetallic compounds Mg 2-xPr xNi 4 ', Materials Transactions, vol. 53, no. 3, pp. 513-517. https://doi.org/10.2320/matertrans.M2011334
Terashita, N. ; Sakaki, K. ; Tsunokake, S. ; Nakamura, Y. ; Akiba, Etsuo. / Hydrogenation properties of ternary intermetallic compounds Mg 2-xPr xNi 4 In: Materials Transactions. 2012 ; Vol. 53, No. 3. pp. 513-517.
@article{f68386f0dde04ae7a80082f06483b029,
title = "Hydrogenation properties of ternary intermetallic compounds Mg 2-xPr xNi 4",
abstract = "Ternary intermetallic compounds, Mg 2-xPr xNi 4 (0.6 ≤ x ≤ 1.4) were synthesized by induction melting and investigated with respect to hydrogenation properties and structural changes. These compounds have a cubic C15 b-type Laves structure (space group F-43m), where Mg and Pr have an ordered arrangement. The lattice parameters increased from a = 0.70101(3)nm to a = 0.71726(8)nm with increase of the Pr content. Mg 1.4Pr 0.6Ni 4 and Mg 1.2Pr 0.8Ni 4 absorbed and desorbed hydrogen up to ∼0.7 H/M reversibly through one plateau in the p-c isotherms. The stoichiometric MgPrNi 4 showed two plateaus and its maximum hydrogen content reached to ∼1.0 H/M at 35MPa. The enthalpy changes of hydrides formation of Mg 1.4Pr 0.6Ni 4 and Mg 1.2Pr 0.8Ni 4 were estimated to be -39.2 and -40.3 kJ/mol H 2 respectively. The enthalpy changes of hydrides formation of MgPrNi 4 at the lower and higher plateaus were estimated to be -42.4 and -19.6 kJ/mol H 2 respectively. The metal sublattice of hydrides Mg 1.4Pr 0.6Ni 4H ∼4 and Mg 1.2Pr 0.8Ni 4H ∼4 had cubic ordered C15 b-type Laves structure same as the crystal structure before hydrogenation while hydride at the lower plateau of the stoichiometric MgPrNi 4 had an orthorhombic structure. The hydrogenation of Mg 0.8Pr 1.2Ni 4 and Mg 0.6Pr 1.4Ni 4 led to amorphization.",
author = "N. Terashita and K. Sakaki and S. Tsunokake and Y. Nakamura and Etsuo Akiba",
year = "2012",
month = "4",
day = "5",
doi = "10.2320/matertrans.M2011334",
language = "English",
volume = "53",
pages = "513--517",
journal = "Materials Transactions",
issn = "0916-1821",
publisher = "The Japan Institute of Metals and Materials",
number = "3",

}

TY - JOUR

T1 - Hydrogenation properties of ternary intermetallic compounds Mg 2-xPr xNi 4

AU - Terashita, N.

AU - Sakaki, K.

AU - Tsunokake, S.

AU - Nakamura, Y.

AU - Akiba, Etsuo

PY - 2012/4/5

Y1 - 2012/4/5

N2 - Ternary intermetallic compounds, Mg 2-xPr xNi 4 (0.6 ≤ x ≤ 1.4) were synthesized by induction melting and investigated with respect to hydrogenation properties and structural changes. These compounds have a cubic C15 b-type Laves structure (space group F-43m), where Mg and Pr have an ordered arrangement. The lattice parameters increased from a = 0.70101(3)nm to a = 0.71726(8)nm with increase of the Pr content. Mg 1.4Pr 0.6Ni 4 and Mg 1.2Pr 0.8Ni 4 absorbed and desorbed hydrogen up to ∼0.7 H/M reversibly through one plateau in the p-c isotherms. The stoichiometric MgPrNi 4 showed two plateaus and its maximum hydrogen content reached to ∼1.0 H/M at 35MPa. The enthalpy changes of hydrides formation of Mg 1.4Pr 0.6Ni 4 and Mg 1.2Pr 0.8Ni 4 were estimated to be -39.2 and -40.3 kJ/mol H 2 respectively. The enthalpy changes of hydrides formation of MgPrNi 4 at the lower and higher plateaus were estimated to be -42.4 and -19.6 kJ/mol H 2 respectively. The metal sublattice of hydrides Mg 1.4Pr 0.6Ni 4H ∼4 and Mg 1.2Pr 0.8Ni 4H ∼4 had cubic ordered C15 b-type Laves structure same as the crystal structure before hydrogenation while hydride at the lower plateau of the stoichiometric MgPrNi 4 had an orthorhombic structure. The hydrogenation of Mg 0.8Pr 1.2Ni 4 and Mg 0.6Pr 1.4Ni 4 led to amorphization.

AB - Ternary intermetallic compounds, Mg 2-xPr xNi 4 (0.6 ≤ x ≤ 1.4) were synthesized by induction melting and investigated with respect to hydrogenation properties and structural changes. These compounds have a cubic C15 b-type Laves structure (space group F-43m), where Mg and Pr have an ordered arrangement. The lattice parameters increased from a = 0.70101(3)nm to a = 0.71726(8)nm with increase of the Pr content. Mg 1.4Pr 0.6Ni 4 and Mg 1.2Pr 0.8Ni 4 absorbed and desorbed hydrogen up to ∼0.7 H/M reversibly through one plateau in the p-c isotherms. The stoichiometric MgPrNi 4 showed two plateaus and its maximum hydrogen content reached to ∼1.0 H/M at 35MPa. The enthalpy changes of hydrides formation of Mg 1.4Pr 0.6Ni 4 and Mg 1.2Pr 0.8Ni 4 were estimated to be -39.2 and -40.3 kJ/mol H 2 respectively. The enthalpy changes of hydrides formation of MgPrNi 4 at the lower and higher plateaus were estimated to be -42.4 and -19.6 kJ/mol H 2 respectively. The metal sublattice of hydrides Mg 1.4Pr 0.6Ni 4H ∼4 and Mg 1.2Pr 0.8Ni 4H ∼4 had cubic ordered C15 b-type Laves structure same as the crystal structure before hydrogenation while hydride at the lower plateau of the stoichiometric MgPrNi 4 had an orthorhombic structure. The hydrogenation of Mg 0.8Pr 1.2Ni 4 and Mg 0.6Pr 1.4Ni 4 led to amorphization.

UR - http://www.scopus.com/inward/record.url?scp=84859231536&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84859231536&partnerID=8YFLogxK

U2 - 10.2320/matertrans.M2011334

DO - 10.2320/matertrans.M2011334

M3 - Article

AN - SCOPUS:84859231536

VL - 53

SP - 513

EP - 517

JO - Materials Transactions

JF - Materials Transactions

SN - 0916-1821

IS - 3

ER -