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Featured researches published by B.K. Rai.


ieee international magnetics conference | 2015

Effect of RE ion valency variation in Tb and Dy doped magnetic SrFe 10−x RE x O 19 hexaferrite

B.K. Rai; L. Wang; Sanjay R. Mishra

M-type hexaferrites are focused of much research because of its outstanding properties such as high saturation magnetism (Ms), high coercivity (Hc), high permeability and low conductive looses, excellent chemical stability, and corrosion resistivity. Because of these properties M-type ferrite find wide industrial applications ranging from microwave devices to recording media [1]. The magnetic and electric properties of these ferrites can be tuned by replacing Fe3+ or Sr2+/Ba2+ with magnetic or non-magnetic ion. The result of these substitutions is to alter magnetocrystalline anisotropy and magnetization to suite particular application. Recent reports have shown the effect of high concentration of RE3+ doping in the M-type of ferrite [2, 3, 4, 5]. The work by Wang [5], the magnetism reduced from 64 emu/g to 64 emu/g with doping of lanthanum (La) with x=0.25at 1200°C while the coercivity was increased greatly from 1.95 kOe to 3.4 kOe. Karimis group [6] showed that the small amount of Ce doping in ferrite leads to variation in the lattice parameter due to dual valence Ce3+/4+. In the present study we have synthesized SrRExFe12-xO19 (RE=Tb or Dy) where RE ions are known display multivalence. Consequently it is important to understand the concomitant structural and magnetic changes resulting from variation in RE valency. The valency changes in turn changes their ionic radii and anisotropy.


Journal of Magnetism and Magnetic Materials | 2012

Physical and magnetic properties of highly aluminum doped strontium ferrite nanoparticles prepared by auto-combustion route

H. Luo; B.K. Rai; Sanjay R. Mishra; Van Vuong Nguyen; J. P. Liu


Journal of Alloys and Compounds | 2013

Synthesis and characterization of high coercivity rare-earth ion doped Sr0.9RE0.1Fe10Al2O19 (RE: Y, La, Ce, Pr, Nd, Sm, and Gd)

B.K. Rai; Sanjay R. Mishra; Van Vuong Nguyen; J. P. Liu


Journal of Nanoscience and Nanotechnology | 2014

Synthesis and magnetic properties of hard-soft SRFe10Al2O19/NiZnFe2O4 ferrite nanocomposites.

B.K. Rai; L. Wang; Sanjay R. Mishra; Van Vuong Nguyen; J. P. Liu


Nanoscale | 2012

Synthesis and properties of near infrared-absorbing magnetic–optical nanopins

Saheel Bhana; B.K. Rai; Sanjay R. Mishra; Yongmei Wang; Xiaohua Huang


Materials Research Bulletin | 2015

Structural and magnetic study of Al3+ doped Ni0.75Zn0.25Fe2−xAlxO4 nanoferrites

L. Wang; B.K. Rai; Sanjay R. Mishra


Journal of Alloys and Compounds | 2013

Influence of RE3+ co-substitution on the structure and magnetic properties of Sr0.82RE0.18Fe12O19 (RE: La0.18−xPrx) ferrites

B.K. Rai; Sanjay R. Mishra; Van Vuong Nguyen; J. P. Liu


Journal of Magnetism and Magnetic Materials | 2013

Magnetically enhanced hard–soft SmCo5–FeNi composites obtained via high energy ball milling and heat treatment

B.K. Rai; Sanjay R. Mishra


MRS Online Proceedings Library Archive | 2013

Structural and Magnetic study of Al 3+ doped Ni 0.75 Zn 0.25 Fe 2-x Al x O 4 nanoferrites

L. Wang; B.K. Rai; Sanjay R. Mishra


Journal of Magnetism and Magnetic Materials | 2014

A structural, magnetic, and Mössbauer study of the Dy2Fe17−xNbx solid solutions

B.K. Rai; K.S. Syed Ali; Sanjay R. Mishra; S. Khanra; K. Ghosh

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J. P. Liu

University of Texas at Arlington

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L. Wang

University of Memphis

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Van Vuong Nguyen

University of Texas at Arlington

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K. Ghosh

Missouri State University

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S. Khanra

Missouri State University

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A. Wilson

University of Memphis

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Chaunbing Rong

University of Texas at Arlington

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H. Luo

University of Memphis

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R.K. Gupta

Pittsburg State University

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