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Effects of dopant induced defects on structural, multiferroic and optical properties of Bi1−xPbxFeO3(0 ≤x≤ 0.3) ceramics
- Source :
- Materials Research Express. 5:016103
- Publication Year :
- 2018
- Publisher :
- IOP Publishing, 2018.
-
Abstract
- Bi1−x Pb x FeO3 (0 ≤ x ≤ 0.3) has been characterized in detail with an aim to identify role of defect such as dopant, various vacancies, grain boundaries etc, and their effect on structural, optical and multiferroic properties. Structural analysis revealed that Pb substitution transforms the rhombohedral phase of BiFeO3 to the pseudocubic phase for x ≥ 0.15, consistently all vibrational Raman modes associated with the rhombohedral phase are found disappeared. Optical response revealed weakening of the d–d transitions with Pb addition indicating change in the Fe atoms environment consistent with the transition from non-centrosymmetric to the centrosymmetric structure. Transport and dielectric responses are explained in terms of hopping due to the presence of defects like oxygen vacancies and grain boundary conduction. In the high temperature regime, grain boundary conduction led to decrease in resistivity with the presence of a hump that is associated with hopping conduction. Extrinsic contributions in the transport properties correlate well with dielectric response. Magnetic and ferroelectric responses are also presented where role of oxygen vacancies defects has been clearly identified.
- Subjects :
- 010302 applied physics
Materials science
Polymers and Plastics
Dopant
Condensed matter physics
Metals and Alloys
02 engineering and technology
Dielectric
021001 nanoscience & nanotechnology
01 natural sciences
Crystallographic defect
Surfaces, Coatings and Films
Electronic, Optical and Magnetic Materials
Biomaterials
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Electrical resistivity and conductivity
Phase (matter)
0103 physical sciences
symbols
Multiferroics
Grain boundary
0210 nano-technology
Raman spectroscopy
Subjects
Details
- ISSN :
- 20531591
- Volume :
- 5
- Database :
- OpenAIRE
- Journal :
- Materials Research Express
- Accession number :
- edsair.doi...........fac5758871dbbce1772c173cb03b273d