Thermodynamic and magnetic properties of GdPd hydride

Masanori Hara; Takayuki Nakazawa; Satoshi Akamaru; Kuniaki Watanabe; Katsuhiko Nishimura; Katsunori Mori; Masao Matsuyama

doi:10.2320/matertrans.MRA2007307

Thermodynamic and magnetic properties of GdPd hydride

Masanori Hara^*, Takayuki Nakazawa, Satoshi Akamaru, Kuniaki Watanabe, Katsuhiko Nishimura, Katsunori Mori, Masao Matsuyama

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

4 Scopus citations

Abstract

Thermodynamic and magnetic properties of GdPd hydride (deuteride) were studied. Each of the pressure-composition isotherms of GdPd-Q (Q = H or D) systems showed a plateau region in 0.05 < [Q]/[GdPd] < 0.4, though hydrogen induced disproportionation of GdPd was observed above [Q]/[GdPd] > 0.4. The disproportionation products were determined to be GdQ₂ and Gd₃Pd₄. Enthalpy changes for GdPd hydride formation at [Q]/[GdPd] = 0.2 were evaluated from the isotherms to be ΔH_fo = -130kJ/mol_H2 and -122kJ/mol_D2. Magnetization measurements revealed that the effective magnetic moments of GdPd and its hydride were approximately the same as that of Gd³⁺. This indicates that magnetic properties of GdPd and its hydride are governed by gadolinium atoms. In fact, the magnetic ordering temperature and the paramagnetic Curie temperature were also found to be almost invariable with hydrogen content, revealing that electrons from the Is orbital of absorbed hydrogen bring little influence on the nature of 4f-electrons of gadolinium. [doi: 10.2320/matertrans.MRA2007307]

Original language	English
Pages (from-to)	1428-1433
Number of pages	6
Journal	Materials Transactions
Volume	49
Issue number	6
DOIs	https://doi.org/10.2320/matertrans.MRA2007307
State	Published - 2008/06

Keywords

Curie temperature
Disproportionation
Effective magnetic moment
GdPd
Hydride formation
Isotherm
Magnetic ordering temperature
Palladium
Rare-earth

ASJC Scopus subject areas

General Materials Science
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

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title = "Thermodynamic and magnetic properties of GdPd hydride",

abstract = "Thermodynamic and magnetic properties of GdPd hydride (deuteride) were studied. Each of the pressure-composition isotherms of GdPd-Q (Q = H or D) systems showed a plateau region in 0.05 < [Q]/[GdPd] < 0.4, though hydrogen induced disproportionation of GdPd was observed above [Q]/[GdPd] > 0.4. The disproportionation products were determined to be GdQ2 and Gd3Pd4. Enthalpy changes for GdPd hydride formation at [Q]/[GdPd] = 0.2 were evaluated from the isotherms to be ΔHfo = -130kJ/molH2 and -122kJ/molD2. Magnetization measurements revealed that the effective magnetic moments of GdPd and its hydride were approximately the same as that of Gd3+. This indicates that magnetic properties of GdPd and its hydride are governed by gadolinium atoms. In fact, the magnetic ordering temperature and the paramagnetic Curie temperature were also found to be almost invariable with hydrogen content, revealing that electrons from the Is orbital of absorbed hydrogen bring little influence on the nature of 4f-electrons of gadolinium. [doi: 10.2320/matertrans.MRA2007307]",

keywords = "Curie temperature, Disproportionation, Effective magnetic moment, GdPd, Hydride formation, Isotherm, Magnetic ordering temperature, Palladium, Rare-earth",

author = "Masanori Hara and Takayuki Nakazawa and Satoshi Akamaru and Kuniaki Watanabe and Katsuhiko Nishimura and Katsunori Mori and Masao Matsuyama",

year = "2008",

month = jun,

doi = "10.2320/matertrans.MRA2007307",

language = "英語",

volume = "49",

pages = "1428--1433",

journal = "Materials Transactions",

issn = "1345-9678",

publisher = "Japan Institute of Metals (JIM)",

number = "6",

}

TY - JOUR

T1 - Thermodynamic and magnetic properties of GdPd hydride

AU - Hara, Masanori

AU - Nakazawa, Takayuki

AU - Akamaru, Satoshi

AU - Watanabe, Kuniaki

AU - Nishimura, Katsuhiko

AU - Mori, Katsunori

AU - Matsuyama, Masao

PY - 2008/6

Y1 - 2008/6

N2 - Thermodynamic and magnetic properties of GdPd hydride (deuteride) were studied. Each of the pressure-composition isotherms of GdPd-Q (Q = H or D) systems showed a plateau region in 0.05 < [Q]/[GdPd] < 0.4, though hydrogen induced disproportionation of GdPd was observed above [Q]/[GdPd] > 0.4. The disproportionation products were determined to be GdQ2 and Gd3Pd4. Enthalpy changes for GdPd hydride formation at [Q]/[GdPd] = 0.2 were evaluated from the isotherms to be ΔHfo = -130kJ/molH2 and -122kJ/molD2. Magnetization measurements revealed that the effective magnetic moments of GdPd and its hydride were approximately the same as that of Gd3+. This indicates that magnetic properties of GdPd and its hydride are governed by gadolinium atoms. In fact, the magnetic ordering temperature and the paramagnetic Curie temperature were also found to be almost invariable with hydrogen content, revealing that electrons from the Is orbital of absorbed hydrogen bring little influence on the nature of 4f-electrons of gadolinium. [doi: 10.2320/matertrans.MRA2007307]

AB - Thermodynamic and magnetic properties of GdPd hydride (deuteride) were studied. Each of the pressure-composition isotherms of GdPd-Q (Q = H or D) systems showed a plateau region in 0.05 < [Q]/[GdPd] < 0.4, though hydrogen induced disproportionation of GdPd was observed above [Q]/[GdPd] > 0.4. The disproportionation products were determined to be GdQ2 and Gd3Pd4. Enthalpy changes for GdPd hydride formation at [Q]/[GdPd] = 0.2 were evaluated from the isotherms to be ΔHfo = -130kJ/molH2 and -122kJ/molD2. Magnetization measurements revealed that the effective magnetic moments of GdPd and its hydride were approximately the same as that of Gd3+. This indicates that magnetic properties of GdPd and its hydride are governed by gadolinium atoms. In fact, the magnetic ordering temperature and the paramagnetic Curie temperature were also found to be almost invariable with hydrogen content, revealing that electrons from the Is orbital of absorbed hydrogen bring little influence on the nature of 4f-electrons of gadolinium. [doi: 10.2320/matertrans.MRA2007307]

KW - Curie temperature

KW - Disproportionation

KW - Effective magnetic moment

KW - GdPd

KW - Hydride formation

KW - Isotherm

KW - Magnetic ordering temperature

KW - Palladium

KW - Rare-earth

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U2 - 10.2320/matertrans.MRA2007307

DO - 10.2320/matertrans.MRA2007307

M3 - 学術論文

AN - SCOPUS:48249096812

SN - 1345-9678

VL - 49

SP - 1428

EP - 1433

JO - Materials Transactions

JF - Materials Transactions

IS - 6

ER -

Thermodynamic and magnetic properties of GdPd hydride

Abstract

Keywords

ASJC Scopus subject areas

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