The Crystal Structure and Magnetic Property of Bi-Substituted Nd₂Fe_17-x-yTi_xSi_y Intermetallic Compounds

Abstract:

The synergetic effects of the substitution of Ti and Si for Fe on the crystallographic structure and magnetic properties of Nd₂Fe_17-x-yTi_xSi_y compounds have been comprehensively investigated by means of x-ray diffraction, neutron diffraction and magnetic measurements. Rietveld refinements of the diffraction data indicate that all the samples crystallize in the rhombohedral Th₂Zn₁₇-type structure. For a given Ti content, the a-axis and the unit cell volume V of Nd₂Fe_17-x-yTi_xSi_y decrease linearly with increasing silicon content, while the c-axis behaves complicatedly dependent on different Ti content. The site occupancies of Ti and Si in the crystallographic sites significantly change compared to what is observed in the corresponding singly substituted compounds. The T_C of doubly substituted Nd₂Fe_16.5-yTi_0.8Si_y and Nd₂Fe_16.5-yTi_0.5Si_y is higher than that of singly substituted Nd₂Fe_16-ySi_y for a lower Si content while the converse behavior is observed for a higher Si content. For a given Ti content, the T_C of Nd₂Fe_17-x-yTi_xSi_y compounds increases with increasing Si content and the M_s first increases and then decreases. The M_s of Nd₂Fe_17-x-yTi_xSi_y decreases with the increase of Ti content.

• Periodical: Applied Mechanics and Materials (Volumes 644-650)
• Pages: 4950-4955
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.644-650.4950
• Online since: September 2014
• Authors: Li Mei Sun*, Song Bai Han, Yun Tao Liu, Dong Feng Chen, Xiang Feng Liu
• Keywords: Magnetic Property, Neutron Diffraction, Rare Earth-Transition Metal Intermetallic Compounds, Site Occupancy

References

[1] Rim Guetari, Riadh Bez, Cizmas Bazil Cizmas, Najeh Mliki, Lotfi Bessais. Magnetic properties and magneto-caloric effect in pseudo-binary intermetallic (Pr, Dy)2Fe17[J]. Journal of Alloys and Compounds, 2013(579): 156-159.

DOI: 10.1016/j.jallcom.2013.04.167

[2] L. Bessais, K. Younsi, S. Khazzan, N. Mliki. X-ray and intrinsic magnetic properties of nanocrystalline Sm2(Fe, M)17 (M = Si, Ga, Co, Cr, Zr or Mo) [J]. Intermetallics, 2011 19 (7): 997-1004.

DOI: 10.1016/j.intermet.2011.03.001

[3] D. Sanavi Khoshnoud, N. Tajabor, F. Pourarian. Thermal expansion anomaly and magnetostriction of Nd2Fe14Si3 intermetallic compound [J]. Journal of Alloys and Compounds, 2012(537): 106-110.

DOI: 10.1016/j.jallcom.2012.05.035

[4] W. B. Yelon, H. Xie, G. J. Long, O. A. Pringle, F. Grandjean, K. H. J. Buschow. Neutron diffraction and Mossbauer effect study of several Nd2Fe17-xAlx solid solutions [J]. Journal of Applied Physics, 1993 73(10): 6029-6031.

DOI: 10.1063/1.353459

[5] N. X. Shen, T. K. Daeubler, J. I. Budnick, W. A. Hines, Y. D. Zhang, D. P. Yang, B. G. Shen, Z. H. Cheng. X-ray diffraction, magnetization and nuclear magnetic resonance study of Y2Fe17-xGax [J]. J. Phys.: Condence. Matter, 1998 10(32): 7133-7144.

DOI: 10.1088/0953-8984/10/32/005

[6] Y. P. Shen, X. Y. Yin, N. Tang, J. L. Wang, D. Yang, W. H. Wang, G. H. Wu, F. M. Yang, X. P. Zhong. Structure and magnetic properties of ErFe11-xGaxTi [J]. J. Phys.: Condence. Matter, 2000 12(50): 10571-10578.

DOI: 10.1088/0953-8984/12/50/317

[7] G. J. Long, G. K. Marasinghe, S. Mishra, O. A. Pringle, Z. Hu, W. N. Yelon, D. P. Middleton, K. H. J. Buschow, F. Grandjean. A magnetic, neutron diffraction, and Mössbauer spectral study of the Nd2Fe17−xAlx solid solutions [J]. Journal of Applied Physics, 1994 76(10): 5383-5393.

DOI: 10.1063/1.357193

[8] E. Girt, M. Guillot, I. P. Swainson, K. M. Krishnan, Z. Altounian, G. Thomas. Structural and magnetic properties of Nd2Fe17-δGaδ [J]. Journal of Applied Physics, 2000 87 (9): 5323-5325.

DOI: 10.1063/1.373335

[9] G. J. Long, G. K. Marasinghe, S. Mishra, O. A. Pringle, F. Grandjean, K. H. J. Buschow, D. P. Middleton, W. B. Yelon, F. Pourarian, O. Isnard O. A neutron diffraction and Mössbauer effect study of the Nd2Fe17−xSix solid solutions [J]. Solid State Communications, 1993 88(10): 761-764.

DOI: 10.1016/0038-1098(93)90872-k

[10] W. B. Yelon, Z. Hu, W. J. James, G. K. Marasinghe. Site affinity of substituents in Nd2Fe17-xTx (T=Cu, Zr, Nb, Ti, V) alloys[J]. Journal of Applied Physics, 1996 79 (8): 5939-5941.

DOI: 10.1063/1.362113

[11] Er Girt, Z. Altounian, M. Mao, I. P. Swainson, R. L. Donaberger. Neutron diffraction study of Fe substitutions in Nd2Fe17-δGaδ (δ=Al, Si, Ga, Mo, W) [J]. Journal of Magnetism and Magnetic Materials, 1996 163(3): L251-L256.

[12] J. Rodriguez-Carjaval. An Introduction to the Program FULLPROF2000, Version July2001, France.

[13] D. P. Middieton, S. R. Mishra, G. J. Long, O. A. Pringle, Z. Hu, W. B. Yelon, F. Grandjean, K. H. J. Buschow. A magnetic, neutrondiffraction, and Mössbauer spectral study of the Ce2Fe17-x Six solid solutions [J]. Journal of Applied Physics, 1995 78(9): 5568-5576.

DOI: 10.1063/1.359678

[14] Z. Hu, W. B. Yelon. Neutron diffraction and magnetic studies of Nd2Fe17−x−z AlxSiz [J]. Journal of Applied Physics, 1994 76(10): 6162-6164.

DOI: 10.1063/1.358432

[15] Z. Hu, W. B. Yelon, W. J. James. Neutron diffraction studies of NdnFem-x-yVxAly [(n, m)=(1, 12), (2, 17), (3, 29)] [J]. Journal of Applied Physics 1996 79(8): 6315-6317.

DOI: 10.1063/1.362704

[16] Er Girt, Z. Altounian,I. P. Swainson. The influence of the enthalpy of mixing on the Fe-substitution in Nd2Fe16. 5X0. 5 (X = Al, Ti, Nb, W) [J]. Physica B, 1997 234-236: 637-639.

DOI: 10.1016/s0921-4526(96)01068-x

[17] W. B. Yelon, Z. Hu, E. W. Singleton, G. C. Hadjipanayis. Neutron diffraction study of lattice changes in Nd2Fe17-xSix(Cy) [J]. Journal of Applied Physics, 1995 78(12): 7196-7201.

DOI: 10.1063/1.360726