Structural, dielectric and multiferroic properties of Er and La substituted BiFeO3 ceramics

Bulletin of materials science

Pragya Pandit⁴  S M Yusuf¹  V G Sathe²  Poorva Sharma⁴  S Satapathy³  P K Gupta⁴ 

[1] Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400 085, India$$Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400 085, IndiaSolid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400 085, India$$;UGC-DAE Consortium for Scientific Research, Indore 452 017, India$$UGC-DAE Consortium for Scientific Research, Indore 452 017, IndiaUGC-DAE Consortium for Scientific Research, Indore 452 017, India$$;Laser Materials Development & Devices Division, Raja Ramanna Centre for Advanced Technology, Indore 452 013, India$$UGC-DAE Consortium for Scientific Research, Indore 452 017, India$$Laser Materials Development & Devices Division, Raja Ramanna Centre for Advanced Technology, Indore 452 013, IndiaLaser Materials Development & Devices Division, Raja Ramanna Centre for Advanced Technology, Indore 452 013, India$$UGC-DAE Consortium for Scientific Research, Indore 452 017, India$$UGC-DAE Consortium for Scientific Research, Indore 452 017, IndiaLaser Materials Development & Devices Division, Raja Ramanna Centre for Advanced Technology, Indore 452 013, India$$UGC-DAE Consortium for Scientific Research, Indore 452 017, India$$;Laser Materials Development & Devices Division, Raja Ramanna Centre for Advanced Technology, Indore 452 013, India$$Laser Materials Development & Devices Division, Raja Ramanna Centre for Advanced Technology, Indore 452 013, IndiaLaser Materials Development & Devices Division, Raja Ramanna Centre for Advanced Technology, Indore 452 013, India$$

关键词: BiFeO3;    multiferroics;    magnetism;    ferroelectricity.;   

DOI  :  

学科分类：材料工程

来源: Indian Academy of Sciences

【 摘 要 】

Erbium (Er) and lanthanum (La) substituted BiFeO₃ (BFO) ceramics have been prepared through conventional solid solution route. X-ray diffraction data indicated a gradual phase transition from rhombohedral to monoclinic structure in Bi_{0.9â€�?�ð�?��?} La_0.1Er_ð‘�? FeO₃ (ð‘�? = 0.05, 0.07 and 0.1) (BLEFO_{ð‘�? = 0.05, 0.07,0.1}) ceramics. Differential thermal analysis (DTA) measurements of BFO samples showed a ferroelectric transition at 835°C, whereas it is shifted to 792°C for BLEFO_{ð‘�? = 0.1}. The Raman spectra of BLEFO_{ð‘�? = 0.05,0.07,0.1} samples showed the shift of Raman modes to higher wavenumbers and suppression of A₁ modes indicating decrease in ferroelectricity. The Raman spectra also indicated the structural transformation due to Er and La substitution in BFO. On subsequent erbium doping, the intrinsic dielectric constant is found to decrease from 68 (for pure BFO) to 52 for BLEFO_{ð‘�? = 0.05} to 43 for BLEFO_{ð‘�? = 0.07} but increased to 89 for BLEFO_{ð‘�? = 0.1} when compared to pure BFO. The increase in Er content resulted in the increase in spontaneous magnetization (0.1178 emu/g at 8T for BLEFO_{ð‘�? = 0.1}) due to collapse of spin cycloid structure. Ferroelectric remnant polarization of BLEFO_{ð‘�? = 0.05} and BLEFO_{ð‘�? = 0.07} decreases when compared to pure BFO while small remnant polarization (close to paraelectric behaviour) is evident for BLEFO_{ð‘�? = 0.1}.

【 授权许可】

Unknown