TY - JOUR
T1 - Investigations on structural, Mossbauer, dielectric, and ferroelectric properties of La doped barium hexaferrite
AU - Nishkala, K. R.
AU - Rao, Rajat Radhakrishna
AU - Mutalik, Srinivas
AU - Murari, M. S.
AU - Daivajna, Mamatha D.
N1 - Funding Information:
The authors (Nishkala K.R.) are grateful to the Manipal Academy of Higher Education, Manipal, for financial assistance; Dr.V. R. Reddy (UGC-DAE CSR Indore) for Mössbauer, dielectric and ferroelectric measurements; Dr. Sudhindra Rayaprol (UGC-DAE CSR Mumbai) for XRD measurements; Dr. Sudha D. Kamath (Dept. of Physics, M.I.T, Manipal) for Density measurements; Mr. Vipin Cyriac (Dept. of Physics, M.I.T. Manipal) for insights on analysis of dielectric spectroscopy.
Funding Information:
The authors (Nishkala K.R.) are grateful to the Manipal Academy of Higher Education, Manipal, for financial assistance; Dr.V. R. Reddy (UGC-DAE CSR Indore) for Mössbauer, dielectric and ferroelectric measurements; Dr. Sudhindra Rayaprol (UGC-DAE CSR Mumbai) for XRD measurements; Dr. Sudha D. Kamath (Dept. of Physics, M.I.T, Manipal) for Density measurements; Mr. Vipin Cyriac (Dept. of Physics, M.I.T., Manipal) for insights on analysis of dielectric spectroscopy.
Publisher Copyright:
© 2023 Elsevier B.V.
PY - 2023/9/1
Y1 - 2023/9/1
N2 - La substituted Barium hexaferrite, Ba(1-x)La(x)Fe12O19, (x = 0, 0.1, 0.15, 0.20) was synthesized using ball milling followed by heat treatment. Rietveld analysis of X-Ray diffraction patterns reveals the formation of a single-phase magnetoplumbite structure of barium hexaferrite for all prepared samples. Morphological studies using FESEM shows the formation of hexagonal plate-like grains with different grain size, and the average grain size decreases with La doping. Elemental analysis using EDS confirms that the observed elemental composition for all the samples is within the expected range within the experimental error. Density measurements observed that porosity decreases up to La content x = 0.15 and then slightly increases for x = 0.20. Mössbauer spectroscopy studies reveal no formation of Fe2+ ions but delocalization of electrons after La doping. There is not much variation in the hyperfine structure with La doping. It is observed from the dielectric spectroscopy that the highest dielectric constant and low loss are observed for La content x = 0.20. The P-E loop of the pristine sample shows small polarisation but leaky behavior, whereas La substitution shows both leaky and resistor circuit-type behavior but large polarization.
AB - La substituted Barium hexaferrite, Ba(1-x)La(x)Fe12O19, (x = 0, 0.1, 0.15, 0.20) was synthesized using ball milling followed by heat treatment. Rietveld analysis of X-Ray diffraction patterns reveals the formation of a single-phase magnetoplumbite structure of barium hexaferrite for all prepared samples. Morphological studies using FESEM shows the formation of hexagonal plate-like grains with different grain size, and the average grain size decreases with La doping. Elemental analysis using EDS confirms that the observed elemental composition for all the samples is within the expected range within the experimental error. Density measurements observed that porosity decreases up to La content x = 0.15 and then slightly increases for x = 0.20. Mössbauer spectroscopy studies reveal no formation of Fe2+ ions but delocalization of electrons after La doping. There is not much variation in the hyperfine structure with La doping. It is observed from the dielectric spectroscopy that the highest dielectric constant and low loss are observed for La content x = 0.20. The P-E loop of the pristine sample shows small polarisation but leaky behavior, whereas La substitution shows both leaky and resistor circuit-type behavior but large polarization.
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U2 - 10.1016/j.physb.2023.414954
DO - 10.1016/j.physb.2023.414954
M3 - Article
AN - SCOPUS:85160647267
SN - 0921-4526
VL - 664
JO - Physica B: Condensed Matter
JF - Physica B: Condensed Matter
M1 - 414954
ER -