RM3Ga2 Compounds (R ≡ rare earth, M ≡ Co, Ni): A new structural series

Frémy, M.A.; Gignoux, D.; Moreau, Jean-Michel; Paccard, D.; Paccard, L.

doi:10.1016/0022-5088(85)90260-7

Cited by 40 publications

(11 citation statements)

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“…There are some published data on the GdNi 5−x Ga x system, where it was reported that GdNi 4 Ga [20] crystallizes with the CaCu 5 type of structure. It was also reported that GdNi 3 Ga 2 crystallizes with a larger unit cell of the YCo 3 Ga 2 type, that is closely related to the CaCu 5 structure [15,17,21]. The hydrogen sorption properties of GdNi 4 Ga [20] and of the binary GdNi 5 [20,22] have also been reported.…”

Section: Introductionmentioning

confidence: 90%

“…In all these systems the equilibrium pressure as well as the hydrogen capacity of the binary compound is drastically reduced by substitution. Some other examples of the influence of substitution on the magnetic and structural properties of AB 5 compounds can be found in the systems RECo 5−x Ga x [11], CeNi 5−x Ga x [12,13], CeNi 5−x Cu x [14] and at the compositions RET 2 Ga 3 (T = Co, Ni, Cu) [15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

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Crystal structure, thermal expansion and hydrogen sorption properties of the alloys

Blažina¹,

Šorgić²,

Drašner³

1999

J. Phys.: Condens. Matter

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Alloys of the composition were prepared and their structural and hydrogen sorption properties were studied. It was found that nickel in can be replaced by gallium up to the composition . The crystal structure of the alloys depends on the heat treatment. The hexagonal structure of the prototype compound ( type; space group ) is preserved in all as-cast alloys. After annealing the alloys of the compositions and crystallize with a larger unit cell of the type, but closely related to the structure of . The linear coefficients of thermal expansion were determined between room temperature and 873 K by x-ray powder diffraction. All alloys exhibit expansion anisotropy; the expansion along the a axis being larger than along the c axis. Alloys have been exposed to hydrogen and were found to absorb up to 4.3 hydrogen atoms per alloy formula unit at room temperature. The hydrogen uptake depends on the structure and the composition of the alloy. Binary and alloys with the larger unit cell are inert to hydrogen at pressures up to 20 MPa. The hydrogen equilibrium pressure and the hydrogen capacity decrease as the content of gallium increases. The entropy and the enthalpy have been calculated for the alloy-hydrogen systems that exhibit a desorption equilibrium plateau.

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Section: Introductionmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Crystal structure, thermal expansion and hydrogen sorption properties of the alloys

Blažina¹,

Šorgić²,

Drašner³

1999

J. Phys.: Condens. Matter

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“…A representation of these two crystallographic structures is given in detail in Refs. (2,4,5). The occurrence of the HoNi Ga -type is connected with a steric e!ect: the substitution of a larger X-element for Ni leads to a shift of some of the Gd-atoms along the c-axis to the z"1/2 plane.…”

Section: Introductionmentioning

confidence: 97%

Relationship between the Synthesis Conditions and the Structural, Electrical, Magnetic, and Hydrogen Absorption Properties of the Ternary Compounds GdNi3X2 with X=Al, Ga, or Sn

Péchev

Chevalier

Darriet

et al. 2000

Journal of Solid State Chemistry

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“…X-ray powder diffraction patterns indicated that the prepared samples HoNis_xAl,, have the CaCus-type structure (Haucke, 1940;Nowotny, 1942) up to x = 2 and the YCo3Ga2-type (Fremy, Gignoux, Moreau, Paccard & Paccard, 1985) for x > 2, the latter type having the unit-cell parameter a larger by a factor of 31/2 than that of the first type. The observed and calculated powder patterns of selected samples are presented in Fig.…”

Section: Xrd Characterization Of the Samplesmentioning

confidence: 95%

Phases, lattice parameters and thermal expansion of HoNi_5−xAl_x, 4 ≥x≥ 0

Gržeta¹,

Šorgić²,

Blažina³

1997

J Appl Cryst

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The phases, lattice parameters and linear coefficient of thermal expansion were determined by X-ray powder diffraction between room temperature and 873 K for the system HoNis_xAlx (3 >_ x > 0). Alloys were hexagonal, in the space group P6/mmm; for 2 >_ x >_ 0 they were isostructural with CaCus, and for 3 >_ x _> 2 they were isostructural with YCo3Ga2. In both cases, the unit-cell parameters a and c increased as the AI content increased. The linear thermal expansion coefficient was composition dependent. Each of the investigated alloys exhibited an anisotropy in thermal expansion, the linear expansion coefficient along the a axis being larger than along the c axis.

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RM3Ga2 Compounds (R ≡ rare earth, M ≡ Co, Ni): A new structural series

Cited by 40 publications

References 1 publication

Crystal structure, thermal expansion and hydrogen sorption properties of the alloys

Crystal structure, thermal expansion and hydrogen sorption properties of the alloys

Relationship between the Synthesis Conditions and the Structural, Electrical, Magnetic, and Hydrogen Absorption Properties of the Ternary Compounds GdNi3X2 with X=Al, Ga, or Sn

Phases, lattice parameters and thermal expansion of HoNi_5−xAl_x, 4 ≥x≥ 0

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RM3Ga2 Compounds (R ≡ rare earth, M ≡ Co, Ni): A new structural series

Cited by 40 publications

References 1 publication

Crystal structure, thermal expansion and hydrogen sorption properties of the alloys

Crystal structure, thermal expansion and hydrogen sorption properties of the alloys

Relationship between the Synthesis Conditions and the Structural, Electrical, Magnetic, and Hydrogen Absorption Properties of the Ternary Compounds GdNi3X2 with X=Al, Ga, or Sn

Phases, lattice parameters and thermal expansion of HoNi5−xAlx, 4 ≥x≥ 0

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Phases, lattice parameters and thermal expansion of HoNi_5−xAl_x, 4 ≥x≥ 0