The effects of Ga addition on the structure and agnetic properties of Nd2Fe14B compounds

Quan, Chengri; Wang, Yizhong; Yin, Lei; Zhao, Jianming

doi:10.1016/0038-1098(89)90435-3

Cited by 12 publications

(5 citation statements)

References 14 publications

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“…The consequences of these evolutions are significant increases of the unit cell volume and of the c/a parameter upon Ga for Fe substitution. A previous study 16 has suggested that this behavior could be linked to a preferential occupation of the Ga substituent atoms on some crystallographic sites. In order to determine the solubility limit of Ga in Nd 2 Fe 14 B, we have also tried to synthesize the Nd 2 Fe 11 Ga 3 B compound but the diffraction pattern clearly exhibits the same lattice parameters as Nd 2 Fe 12.2 Ga 1.8 B as well as the existence of extra phases.…”

Section: A Crystal Structurementioning

confidence: 88%

Determination of the substitution scheme of gallium and magnetic features of Nd2Fe14−xGaxB

Isnard

2000

Journal of Applied Physics

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The unsolved question of the location of the gallium atoms within the Nd2Fe14B structure is addressed. We have performed a high-resolution neutron diffraction investigation on Nd2Fe14−xGaxB powder samples evidencing a preferential substitution of Ga in the Fe (4c), Fe (8j1), and Fe (16k2) sites of the structure. The crystal structure has been investigated using the Rietveld method and the evolution of the shorter iron–iron interatomic distances has been linked to the observed increase of the Curie temperature when the Ga concentration increases. The combined use of neutron diffraction investigation and of scanning electron microscope analysis reveals that the solubility limit of Ga is equal to 1.8 atoms per formula unit. The effects of Ga for Fe substitution on the structural and magnetic properties of the Nd2Fe14−xGaxB compounds have been studied. The magnetic moment values of each atom and the saturation magnetization are clearly sensitive to the Ga for Fe substitution but also to the temperature. A significant modification of the Nd atoms near neighborhood is observed via the evolution of the interatomic distances and the influence of the Ga concentration on the spin reorientation temperature is discussed. The angle of tilt of the magnetization away from the c axis has been determined below the spin reorientation temperature for both Nd2Fe13GaB and Nd2Fe12.2Ga1.8B phases. Finally, a comparison with the influence of Ga on the structural properties of R2Fe17 compounds is presented.

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Section: A Crystal Structurementioning

confidence: 88%

Determination of the substitution scheme of gallium and magnetic features of Nd2Fe14−xGaxB

Isnard

2000

Journal of Applied Physics

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“…The iron was replaced by gallium up to x = 2-2.1 in compounds with Nd , Xie et al 1988, Quan et al 1989, or up to x = 1 for R = Pr (Kowalczyk 1989), R = Nd (Grössinger et al 1988b, Kou et al 1989c, Burzo and Plugaru 1991 and R = Gd, Y (Sun X K et al 1989b).…”

Section: Crystal Structure Of R 2 Fe 14 B-and R 2 Fe 14 C-based Compo...mentioning

confidence: 99%

“…• R 2 Fe 14−x Ga x B with R = Pr (Pedziwiatr et al 1988, Kowalczyk 1989; R = Nd , Grössinger et al 1988b, Pedziwiatr et al 1988, Xie et al 1988, Kou et al 1989c, Quan et al 1989; R = Gd (Sun X K et al 1989b, Kou et al 1990c, Wiessinger et al 1992; R = Er (Radwanski et al 1992); R = Y (Sun X K et al 1989b, Burzo and Plugaru 1991, Kou et al 1992c, Wiessinger et al 1992.…”

Section: D Magnetismmentioning

confidence: 99%

Permanent magnets based on R-Fe-B and R-Fe-C alloys

Burzo

1998

Rep. Prog. Phys.

206

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A review is given on the basic properties of 2:14:1 hard magnetic phases as well as technological procedures used for manufacturing R-Fe-B and R-Fe-C permanent magnets. First, we analyse the phase diagrams, crystal structure of hard magnetic phases and composition ranges in which these phases form solid solutions, as a result of various types of substitution. Then, the magnetic properties of R 2 Fe 14 B-, R 2 Fe 14 C-and R 2 Co 14 Bbased compounds are described. The routes used for manufacturing R-Fe-B and R-Fe-C permanent magnets are detailed. The magnets' microstructure as well as their coercivities are described in correlation with composition and manufacturing routes. The properties of nanostructure magnets are then presented. Finally, the stability of Nd-Fe-B and Nd-Fe-C magnets in various working conditions is analysed.

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“…And the Curie temperatures T c of Nd 2 Fe 14 B, a-Fe and Fe 3 B phases almost do not change by the addition of Ga, which is in contrast with the dependence of T c of Nd 2 (Fe 1-x-Ga x ) 14 B in which Ga atoms were proved to replace Fe atoms in the Nd 2 Fe 14 B phase. 10 The Curie temperatures in R-T (R ¼ rare earth metal, T ¼ transition metal) compounds depend upon the summarization of Fe-Fe exchange interactions; it increases with increasing Fe-Fe interatomic distan-ces and with decreasing the number of Fe nearest neighbors. 11 The constant Curie temperature indicates that Fe-Fe interatomic distances and the number of Fe nearest neighbors are not changed with the Ga content.…”

Section: Resultsmentioning

confidence: 99%

Effects of Ga addition on structural and magnetic properties of nanocomposite Nd-Fe-B-Ti-C thick ribbons

Guo

et al. 2012

Journal of Applied Physics

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The effects of Ga addition on the structure and agnetic properties of Nd2Fe14B compounds

Cited by 12 publications

References 14 publications

Determination of the substitution scheme of gallium and magnetic features of Nd2Fe14−xGaxB

Determination of the substitution scheme of gallium and magnetic features of Nd2Fe14−xGaxB

Permanent magnets based on R-Fe-B and R-Fe-C alloys

Effects of Ga addition on structural and magnetic properties of nanocomposite Nd-Fe-B-Ti-C thick ribbons

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