THE EFFECT OF SUBSTITUTION IN Nd2Fe14-xZxB (Z = Al, Si, Ga, Co, Ni) COMPOUNDS

Größinger, R.; Chou, Xiaochen; Krewenka, R.; Wiesinger, G.; Eibler, R.; Sun, X.K.; Chuang, Y.C.

doi:10.1051/jphyscol:19888273

Cited by 4 publications

(12 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The Ga for Fe substitution also modifies the temperature of spin reorientation. 31,32 The spin reorientation phenomenon occurring on the Nd 2 Fe 14 B compounds corresponds to a change of the spin arrangement from conical to an orientation of the magnetic moments along the c axis. [33][34][35] It is the result of a competition between the magnetocrystalline anisotropy terms due to the Nd and Fe sublattices that imposes the direction of magnetization.…”

Section: B Magnetic Propertiesmentioning

confidence: 99%

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

Isnard

2000

Journal of Applied Physics

View full text Add to dashboard Cite

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.

show abstract

Section: B Magnetic Propertiesmentioning

confidence: 99%

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

Isnard

2000

Journal of Applied Physics

View full text Add to dashboard Cite

show abstract

“…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%

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

Burzo

1998

Rep. Prog. Phys.

210

View full text Add to dashboard Cite

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.

show abstract

“…A profile analysis with the Rietveld technique indicated that all the studied alloys possess the tetragonal 2:14:1 (P4 2 /mmm) phase. Traces of minority phases were also detected, which are probably a mixture of Nd-rich phases, Ndcarbides (such as Nd 2 C 3 ) as well as a mixture α-and ε-type structures, as has been observed in this class of compounds [3,5,6,16,21,24]. The relative proportion of the secondary phases seemingly diminishes with the Ru content, as can be observed by the decrease of the intensities of the Bragg reflections.…”

Section: Resultsmentioning

confidence: 78%

“…Among the six nonequivalent crystallographic Fe sites, namely, 16k 1 , 16k 2 , 8j 1 , 8j 2 , 4e and 4c, the k-sites are preferred by the substituent for transition metals, while a preference of Fe for the j-sites has been found [1,[7][8][9]16]. As Co atoms substitute for Fe atoms a deviation from random occupation has already been reported [3,17]. An increase of the Curie temperature is observed as well as a decrease in the saturation magnetization and in the anisotropy field.…”

Section: Introductionmentioning

confidence: 98%

“…Few decades ago the discovery of a new class of high energy magnets based on the rare earth-transition metal (R-T) compounds has stimulated the search for new ternary intermetallics as promising candidates for applications as permanent magnets [1][2][3][4][5][6]. Experimental findings have shown that the intrinsic magnetic properties of Nd 2 Fe 14 B-based magnets can be improved with the addition of transition metals [7][8][9][10][11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

An investigation of structural and magnetic properties of the Nd16Co72-xRu xC11B coro-carbides

et al. 2008

View full text Add to dashboard Cite

Nd 16 Co 72−x Ru x C 11 B boro-carbides have been prepared by arc melting and studied by X-ray diffraction and magnetization measurements. X-ray diffraction results confirm that all the prepared alloys possess the tetragonal 2:14:1 (P4 2 /mmm) hard magnetic phase. The observed decrease of the magnetization and Curie temperature indicate the development of antiferromagnetic spin correlations with the increase of the Ru content. The combined addition of B and C is favorable to the formation and stabilization of the tetragonal phase in these compounds. At lower Ru contents the Curie temperature is higher than in the corresponding Co-based boride in spite of larger cell volumes.

show abstract

THE EFFECT OF SUBSTITUTION IN Nd₂Fe_14-xZ_xB (Z = Al, Si, Ga, Co, Ni) COMPOUNDS

Cited by 4 publications

References 2 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

An investigation of structural and magnetic properties of the Nd16Co72-xRu xC11B coro-carbides

Contact Info

Product

Resources

About