Stability and physical properties of the K, Na and Nb doped BiFeO3 lead-free system synthesized by the solid state route
Por:
Sharma, Subhash, Reygadas, M. U., Kumar, Manish, Cruz, M. P., Siqueiros, J. M., Herrera, O. Raymond
Publicada:
1 sep 2023
Resumen:
A study of the structural, dielectric, and optical properties of the
lead-free ceramic compound (1-x)BiFeO3-(x) (K0.5Na0.5)NbO3
[(1-x)BFO-(x)KNN] prepared by the solid-state reaction method is
presented. The structural analysis was carried out by performing
Rietveld refinement on the X-ray diffraction data showing a distorted
rhombohedral structure of the R3c space group for all samples. The
presence of all active Raman modes confirms this result. The effect of
K, Na, and Nb incorporation in the BFO structure is clearly seen in the
scanning electron microscopy micrographs of the samples, and energy
dispersive x-ray spectroscopy (EDS) confirms the existence of all
elements. Piezoelectric force microscopy analysis reveals a well-defined
domain structure for the higher concentrations of KNN as well as
ferroelectric switching behavior. The room temperature dielectric
response increases with KNN doping. A small hump in the dielectric
permittivity vs. temperature plots is observed near 350 degrees C and is
ascribed to a para-antiferromagnetic phase transition at the Ne`el
temperature. An optical ab-sorption study revealed that tuning of the
bandgap energy is possible through controlled doping, as shown in the
present case, where the bandgap varies from 2.16 eV for x = 0.0 to 1.93
eV for x = 0.08. The results of this investigation demonstrate that K,
Na, and Nb doping is an effective way to enhance the dielectric and
optical properties of BFO.
Filiaciones:
Sharma, Subhash:
CONAHCyT- Centro de Nanociencias y Nanotecnología, Universidad Nacional Autónoma de México, Km 107 Carretera Tijuana-Ensenada, AP 14, Ensenada, B.C. 22860, Mexico
Centro de Nanociencias y Nanotecnología, Universidad Nacional Autónoma de México, Km 107 Carretera Tijuana-Ensenada, AP 14, Ensenada, B.C. 22860, Mexico
Univ Nacl Autonoma Mexico, CONAHCyT Ctr Nanociencias & Nanotecnol, Km 107 Carretera Tijuana Ensenada,AP 14, Ensenada 22860, BC, Mexico
Univ Nacl Autonoma Mexico, Ctr Nanociencias & Nanotecnol, Km 107 Carretera Tijuana Ensenada,AP 14, Ensenada 22860, BC, Mexico
Reygadas, M. U.:
Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional, Unidad Querétaro, Mexico
Inst Politecn Nacl, Ctr Invest & Estudios Avanzados, Unidad Queretaro, Mexico City, DF, Mexico
Kumar, Manish:
Experimental Research Laboratory, Department of Physics, ARSD College, University of Delhi, New Delhi, India
Univ Delhi, ARSD Coll, Dept Phys, Expt Res Lab, New Delhi, India
Cruz, M. P.:
Centro de Nanociencias y Nanotecnología, Universidad Nacional Autónoma de México, Km 107 Carretera Tijuana-Ensenada, AP 14, Ensenada, B.C. 22860, Mexico
Univ Nacl Autonoma Mexico, Ctr Nanociencias & Nanotecnol, Km 107 Carretera Tijuana Ensenada,AP 14, Ensenada 22860, BC, Mexico
Siqueiros, J. M.:
Centro de Nanociencias y Nanotecnología, Universidad Nacional Autónoma de México, Km 107 Carretera Tijuana-Ensenada, AP 14, Ensenada, B.C. 22860, Mexico
Univ Nacl Autonoma Mexico, Ctr Nanociencias & Nanotecnol, Km 107 Carretera Tijuana Ensenada,AP 14, Ensenada 22860, BC, Mexico
Herrera, O. Raymond:
Centro de Nanociencias y Nanotecnología, Universidad Nacional Autónoma de México, Km 107 Carretera Tijuana-Ensenada, AP 14, Ensenada, B.C. 22860, Mexico
Univ Nacl Autonoma Mexico, Ctr Nanociencias & Nanotecnol, Km 107 Carretera Tijuana Ensenada,AP 14, Ensenada 22860, BC, Mexico
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