Structural, Magnetic, and Electrical Properties of RE Doped Sr0.82RE0.18Fe12-xAlxO19 (RE = Gd, Pr, Sm) Compound - Advances in Materials Physics and Chemistry

AMPC > Vol.9 No.9, September 2019

Structural, Magnetic, and Electrical Properties of RE Doped Sr_0.82RE_0.18Fe_12-xAl_xO₁₉ (RE = Gd, Pr, Sm) Compound ()

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DOI: 10.4236/ampc.2019.99014 981 Downloads 2,410 Views Citations

Author(s)

Dom Lal Kunwar^1,2*, Dipesh Neupane^1,3, Jiba Nath Dahal^1,4, Sanjay R. Mishra¹

Affiliation(s)

¹Department of Physics and Material Science, The University of Memphis, Memphis, TN, USA.
²Department of Physics, Kent State University, Kent, OH, USA.
³Department of Engineering Technology, The University of Memphis, Memphis, TN, USA.
⁴Department of Physics, Truman State University, Kirksville, MO, USA.

ABSTRACT

Among the family of ferrites, M-type hexaferrites has many industrial applications ranging from simple magnets to microwave devices. Improvement in magnetic and dielectric properties of ferrites is of continuous interest. In this present work details study is done to observe the effect of co-doping of rare-earth (RE³⁺: Pr³⁺, Sm³⁺, and Gd³⁺) and aluminum in Sr_0.82RE_0.18Fe_12-xAl_xO₁₉ (x = 0.0, 0.5, 1.0, 1.5, 2.0). The adopted samples were synthesized via autocombustion technique. Detailed synthesis, structural, magnetic, and electrical measurements of samples were performed to understand structural-magnetic-electrical property relationship. The Al³⁺ substitution for Fe³⁺ brings in a significant enhancement in coercivity but reduces magnetization due to the magnetic dilution effect. Additional coercivity enhancement was possible with RE³⁺ doping without affecting the magnetization of samples. Among all RE³⁺ doped samples, Pr³⁺ doped samples showed the highest Curie temperature, (T_c ~ 465℃), while Gd³⁺ doped samples showed little variation in dielectric properties in GHz frequency range. This makes RE³⁺ doped samples as an ideal candidate for high-frequency microwave applications. Pr³⁺ with oblate charge distribution (negative Stevens constant) was observed to substitute well into the lattice consequently bringing in desired improvements in physical properties of Sr_0.82RE_0.18Fe_12-xAl_xO₁₉ ferrite.

KEYWORDS

Sr-Ferrite, Nanocomposite, Magnetization, Curie Temperature, Coercivity, Dielectric Constant

Share and Cite:

Kunwar, D. , Neupane, D. , Dahal, J. and Mishra, S. (2019) Structural, Magnetic, and Electrical Properties of RE Doped Sr_0.82RE_0.18Fe_12-xAl_xO₁₉ (RE = Gd, Pr, Sm) Compound. Advances in Materials Physics and Chemistry, 9, 175-198. doi: 10.4236/ampc.2019.99014.

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