Crystal structure and magnetic properties of Bi0.8A0.2FeO3 (A = La, Ca, Sr, Ba) multiferroics using neutron diffraction and Mossbauer spectroscopy
Bi0.8A0.2FeO3 (A = La, Ca, Sr, Ba) multiferroics were studied using x-ray, neutron diffraction and magnetization techniques. All the samples crystallized in rhombohedral structure with space group R3c. The compounds exhibit antiferromagnetic (AFM) ordering at 300 K and no evidence of further structu...
| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
AIP Publishing LLC
2014-08-01
|
| Series: | AIP Advances |
| Online Access: | http://dx.doi.org/10.1063/1.4893241 |
| _version_ | 1818469890651062272 |
|---|---|
| author | Manisha Rangi Ashish Agarwal Sujata Sanghi Ripandeep Singh S. S. Meena A. Das |
| author_facet | Manisha Rangi Ashish Agarwal Sujata Sanghi Ripandeep Singh S. S. Meena A. Das |
| author_sort | Manisha Rangi |
| collection | DOAJ |
| description | Bi0.8A0.2FeO3 (A = La, Ca, Sr, Ba) multiferroics were studied using x-ray, neutron diffraction and magnetization techniques. All the samples crystallized in rhombohedral structure with space group R3c. The compounds exhibit antiferromagnetic (AFM) ordering at 300 K and no evidence of further structural or magnetic transition was observed on lowering of temperature below it. The magnetic structure of these substituted compounds are found to be collinear G-type AFM structure as against the non collinear incommensurate magnetic structure reported in the case of parent compound. The moments on Fe at 6 K are aligned along the a-axis in the case of Ca-doped sample. With increase in the ionic radii of dopant, the moments are found to be aligned in the ac plane and the angle of tilt away from the a-axis increases. The observed change in the magnetic structure with substitution is attributed to the intrinsic structural distortion as evidenced by the change in the bond angle (Fe-O-Fe) and bond distances (Bi-O, Fe-O). It has been found that heterovalent substitution A2+ results in the formation of oxygen vacancies in the parent lattices as the possibility of Fe4+ ruled out by Mössbauer spectra recorded at room temperature. Higher value of remnant magnetization (0.4187 emu/g) and coercivity (4.7554kOe) is observed in Bi0.8Ba0.2FeO3 sample in comparison to other substituted samples revealing a strong correlation between ionic radii and magnetization. |
| first_indexed | 2024-04-13T21:30:44Z |
| format | Article |
| id | doaj.art-6ecc31295bf94ae8923d6b989e4bbaa7 |
| institution | Directory Open Access Journal |
| issn | 2158-3226 |
| language | English |
| last_indexed | 2024-04-13T21:30:44Z |
| publishDate | 2014-08-01 |
| publisher | AIP Publishing LLC |
| record_format | Article |
| series | AIP Advances |
| spelling | doaj.art-6ecc31295bf94ae8923d6b989e4bbaa72022-12-22T02:29:10ZengAIP Publishing LLCAIP Advances2158-32262014-08-0148087121087121-1110.1063/1.4893241016408ADVCrystal structure and magnetic properties of Bi0.8A0.2FeO3 (A = La, Ca, Sr, Ba) multiferroics using neutron diffraction and Mossbauer spectroscopyManisha Rangi0Ashish Agarwal1Sujata Sanghi2Ripandeep Singh3S. S. Meena4A. Das5Department of Applied Physics, Guru Jambheshwar University of Science & Technology, Hisar-125001 (Haryana) IndiaDepartment of Applied Physics, Guru Jambheshwar University of Science & Technology, Hisar-125001 (Haryana) IndiaDepartment of Applied Physics, Guru Jambheshwar University of Science & Technology, Hisar-125001 (Haryana) IndiaSolid State Physics Division, Bhabha Atomic Research Centre, Mumbai-400 085, IndiaSolid State Physics Division, Bhabha Atomic Research Centre, Mumbai-400 085, IndiaSolid State Physics Division, Bhabha Atomic Research Centre, Mumbai-400 085, IndiaBi0.8A0.2FeO3 (A = La, Ca, Sr, Ba) multiferroics were studied using x-ray, neutron diffraction and magnetization techniques. All the samples crystallized in rhombohedral structure with space group R3c. The compounds exhibit antiferromagnetic (AFM) ordering at 300 K and no evidence of further structural or magnetic transition was observed on lowering of temperature below it. The magnetic structure of these substituted compounds are found to be collinear G-type AFM structure as against the non collinear incommensurate magnetic structure reported in the case of parent compound. The moments on Fe at 6 K are aligned along the a-axis in the case of Ca-doped sample. With increase in the ionic radii of dopant, the moments are found to be aligned in the ac plane and the angle of tilt away from the a-axis increases. The observed change in the magnetic structure with substitution is attributed to the intrinsic structural distortion as evidenced by the change in the bond angle (Fe-O-Fe) and bond distances (Bi-O, Fe-O). It has been found that heterovalent substitution A2+ results in the formation of oxygen vacancies in the parent lattices as the possibility of Fe4+ ruled out by Mössbauer spectra recorded at room temperature. Higher value of remnant magnetization (0.4187 emu/g) and coercivity (4.7554kOe) is observed in Bi0.8Ba0.2FeO3 sample in comparison to other substituted samples revealing a strong correlation between ionic radii and magnetization.http://dx.doi.org/10.1063/1.4893241 |
| spellingShingle | Manisha Rangi Ashish Agarwal Sujata Sanghi Ripandeep Singh S. S. Meena A. Das Crystal structure and magnetic properties of Bi0.8A0.2FeO3 (A = La, Ca, Sr, Ba) multiferroics using neutron diffraction and Mossbauer spectroscopy AIP Advances |
| title | Crystal structure and magnetic properties of Bi0.8A0.2FeO3 (A = La, Ca, Sr, Ba) multiferroics using neutron diffraction and Mossbauer spectroscopy |
| title_full | Crystal structure and magnetic properties of Bi0.8A0.2FeO3 (A = La, Ca, Sr, Ba) multiferroics using neutron diffraction and Mossbauer spectroscopy |
| title_fullStr | Crystal structure and magnetic properties of Bi0.8A0.2FeO3 (A = La, Ca, Sr, Ba) multiferroics using neutron diffraction and Mossbauer spectroscopy |
| title_full_unstemmed | Crystal structure and magnetic properties of Bi0.8A0.2FeO3 (A = La, Ca, Sr, Ba) multiferroics using neutron diffraction and Mossbauer spectroscopy |
| title_short | Crystal structure and magnetic properties of Bi0.8A0.2FeO3 (A = La, Ca, Sr, Ba) multiferroics using neutron diffraction and Mossbauer spectroscopy |
| title_sort | crystal structure and magnetic properties of bi0 8a0 2feo3 a la ca sr ba multiferroics using neutron diffraction and mossbauer spectroscopy |
| url | http://dx.doi.org/10.1063/1.4893241 |
| work_keys_str_mv | AT manisharangi crystalstructureandmagneticpropertiesofbi08a02feo3alacasrbamultiferroicsusingneutrondiffractionandmossbauerspectroscopy AT ashishagarwal crystalstructureandmagneticpropertiesofbi08a02feo3alacasrbamultiferroicsusingneutrondiffractionandmossbauerspectroscopy AT sujatasanghi crystalstructureandmagneticpropertiesofbi08a02feo3alacasrbamultiferroicsusingneutrondiffractionandmossbauerspectroscopy AT ripandeepsingh crystalstructureandmagneticpropertiesofbi08a02feo3alacasrbamultiferroicsusingneutrondiffractionandmossbauerspectroscopy AT ssmeena crystalstructureandmagneticpropertiesofbi08a02feo3alacasrbamultiferroicsusingneutrondiffractionandmossbauerspectroscopy AT adas crystalstructureandmagneticpropertiesofbi08a02feo3alacasrbamultiferroicsusingneutrondiffractionandmossbauerspectroscopy |