Mechanosynthesis, magnetic and Mössbauer characterization of pure and Ti4+-doped cubic phase BiFeO3 nanocrystalline particles

H. M. Widatallah, M. S. Al-Qayoudhi, A. Gismelseed, A. Al-Rawas, S. H. Al-Harthi, M. E H Khalafalla, M. Elzain, A. Yousif, I. Al-Omari

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Abstract

The mechanosynthesis of cubic γ-phase pure BiFeO3 and Ti4+-doped BiFeO3 nanocrystalline particles and their preliminary characterization with magnetic measurements and Mössbauer spectroscopy are reported. The BiFeO3 nanoparticles (5-40 nm) were prepared by heating a 48 h pre-milled 1:1 molar mixture of α-Bi2O3 and α-Fe2O3 at 400 °C for (1 h). Doping α-Fe2O3 in the initial mixture of reactants with Ti4+ was found to lead to the formation of Ti4+-doped BiFeO3 nanoparticles by milling the reactants for 32 h. The magnetization of the BiFeO3 nanoparticles is found to be tripled under a maximum external field of 1.35 T and their magnetic hardness increases by ∼15 times relative to those of the corresponding bulk. The Ti4+-doped BiFeO3 nanoparticles exhibit higher magnetization relative to the pure ones. These observations are related to the spiral modulated spin structure of the compound. The Mössbauer data show ∼12 % of the BiFeO3 nanocrystalline particles to be superparamagnetic having blocking temperatures of less than 78 K. The quadrupole shift values of the magnetic spectral component favor the cubic structural symmetry. These observations were mainly associated with possible collective magnetic excitations as well as transverse relaxation of canted surface spins. The Ti-doped BiFeO3 nanoparticles gave statistically-poor Mössbauer spectra with no signs of a superparamagnetic behavior.

Original languageEnglish
Pages (from-to)143-151
Number of pages9
JournalHyperfine Interactions
Volume226
Issue number1-3
DOIs
Publication statusPublished - 2014

Fingerprint

Nanoparticles
nanoparticles
Magnetization
magnetization
Magnetic variables measurement
magnetic measurement
hardness
quadrupoles
Hardness
Doping (additives)
Spectroscopy
Heating
heating
shift
symmetry
spectroscopy
excitation
Temperature
temperature

Keywords

  • Mössbauer spectroscopy
  • Multiferroics
  • Nanocrystalline materials
  • Perovskites

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Nuclear and High Energy Physics
  • Atomic and Molecular Physics, and Optics
  • Physical and Theoretical Chemistry

Cite this

@article{d56e1ce027354eaa91fbc8fbf980a1c1,
title = "Mechanosynthesis, magnetic and M{\"o}ssbauer characterization of pure and Ti4+-doped cubic phase BiFeO3 nanocrystalline particles",
abstract = "The mechanosynthesis of cubic γ-phase pure BiFeO3 and Ti4+-doped BiFeO3 nanocrystalline particles and their preliminary characterization with magnetic measurements and M{\"o}ssbauer spectroscopy are reported. The BiFeO3 nanoparticles (5-40 nm) were prepared by heating a 48 h pre-milled 1:1 molar mixture of α-Bi2O3 and α-Fe2O3 at 400 °C for (1 h). Doping α-Fe2O3 in the initial mixture of reactants with Ti4+ was found to lead to the formation of Ti4+-doped BiFeO3 nanoparticles by milling the reactants for 32 h. The magnetization of the BiFeO3 nanoparticles is found to be tripled under a maximum external field of 1.35 T and their magnetic hardness increases by ∼15 times relative to those of the corresponding bulk. The Ti4+-doped BiFeO3 nanoparticles exhibit higher magnetization relative to the pure ones. These observations are related to the spiral modulated spin structure of the compound. The M{\"o}ssbauer data show ∼12 {\%} of the BiFeO3 nanocrystalline particles to be superparamagnetic having blocking temperatures of less than 78 K. The quadrupole shift values of the magnetic spectral component favor the cubic structural symmetry. These observations were mainly associated with possible collective magnetic excitations as well as transverse relaxation of canted surface spins. The Ti-doped BiFeO3 nanoparticles gave statistically-poor M{\"o}ssbauer spectra with no signs of a superparamagnetic behavior.",
keywords = "M{\"o}ssbauer spectroscopy, Multiferroics, Nanocrystalline materials, Perovskites",
author = "Widatallah, {H. M.} and Al-Qayoudhi, {M. S.} and A. Gismelseed and A. Al-Rawas and Al-Harthi, {S. H.} and Khalafalla, {M. E H} and M. Elzain and A. Yousif and I. Al-Omari",
year = "2014",
doi = "10.1007/s10751-013-0978-3",
language = "English",
volume = "226",
pages = "143--151",
journal = "Hyperfine Interaction",
issn = "0304-3843",
publisher = "Springer Netherlands",
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}

TY - JOUR

T1 - Mechanosynthesis, magnetic and Mössbauer characterization of pure and Ti4+-doped cubic phase BiFeO3 nanocrystalline particles

AU - Widatallah, H. M.

AU - Al-Qayoudhi, M. S.

AU - Gismelseed, A.

AU - Al-Rawas, A.

AU - Al-Harthi, S. H.

AU - Khalafalla, M. E H

AU - Elzain, M.

AU - Yousif, A.

AU - Al-Omari, I.

PY - 2014

Y1 - 2014

N2 - The mechanosynthesis of cubic γ-phase pure BiFeO3 and Ti4+-doped BiFeO3 nanocrystalline particles and their preliminary characterization with magnetic measurements and Mössbauer spectroscopy are reported. The BiFeO3 nanoparticles (5-40 nm) were prepared by heating a 48 h pre-milled 1:1 molar mixture of α-Bi2O3 and α-Fe2O3 at 400 °C for (1 h). Doping α-Fe2O3 in the initial mixture of reactants with Ti4+ was found to lead to the formation of Ti4+-doped BiFeO3 nanoparticles by milling the reactants for 32 h. The magnetization of the BiFeO3 nanoparticles is found to be tripled under a maximum external field of 1.35 T and their magnetic hardness increases by ∼15 times relative to those of the corresponding bulk. The Ti4+-doped BiFeO3 nanoparticles exhibit higher magnetization relative to the pure ones. These observations are related to the spiral modulated spin structure of the compound. The Mössbauer data show ∼12 % of the BiFeO3 nanocrystalline particles to be superparamagnetic having blocking temperatures of less than 78 K. The quadrupole shift values of the magnetic spectral component favor the cubic structural symmetry. These observations were mainly associated with possible collective magnetic excitations as well as transverse relaxation of canted surface spins. The Ti-doped BiFeO3 nanoparticles gave statistically-poor Mössbauer spectra with no signs of a superparamagnetic behavior.

AB - The mechanosynthesis of cubic γ-phase pure BiFeO3 and Ti4+-doped BiFeO3 nanocrystalline particles and their preliminary characterization with magnetic measurements and Mössbauer spectroscopy are reported. The BiFeO3 nanoparticles (5-40 nm) were prepared by heating a 48 h pre-milled 1:1 molar mixture of α-Bi2O3 and α-Fe2O3 at 400 °C for (1 h). Doping α-Fe2O3 in the initial mixture of reactants with Ti4+ was found to lead to the formation of Ti4+-doped BiFeO3 nanoparticles by milling the reactants for 32 h. The magnetization of the BiFeO3 nanoparticles is found to be tripled under a maximum external field of 1.35 T and their magnetic hardness increases by ∼15 times relative to those of the corresponding bulk. The Ti4+-doped BiFeO3 nanoparticles exhibit higher magnetization relative to the pure ones. These observations are related to the spiral modulated spin structure of the compound. The Mössbauer data show ∼12 % of the BiFeO3 nanocrystalline particles to be superparamagnetic having blocking temperatures of less than 78 K. The quadrupole shift values of the magnetic spectral component favor the cubic structural symmetry. These observations were mainly associated with possible collective magnetic excitations as well as transverse relaxation of canted surface spins. The Ti-doped BiFeO3 nanoparticles gave statistically-poor Mössbauer spectra with no signs of a superparamagnetic behavior.

KW - Mössbauer spectroscopy

KW - Multiferroics

KW - Nanocrystalline materials

KW - Perovskites

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U2 - 10.1007/s10751-013-0978-3

DO - 10.1007/s10751-013-0978-3

M3 - Article

VL - 226

SP - 143

EP - 151

JO - Hyperfine Interaction

JF - Hyperfine Interaction

SN - 0304-3843

IS - 1-3

ER -