Nanoscale Piezoelectric Properties and Phase Separation in Pure and La-Doped BiFeO3 Films Prepared by Sol–Gel Method
<span style="color: windowtext;">Pure BiFeO<sub>3</sub> (BFO) and doped Bi<sub>0.9</sub>La<sub>0.1</sub>FeO<sub>3</sub> (BLFO) thin films were prepared on Pt/TiO<sub>2</sub>/SiO<sub>2</sub>/Si substrates by a mo...
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| Online Access: | https://www.mdpi.com/1996-1944/14/7/1694 |
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doaj-8731e51b5f004b44b19c54b5f797baea2021-03-30T23:03:23ZengMDPI AGMaterials1996-19442021-03-01141694169410.3390/ma14071694Nanoscale Piezoelectric Properties and Phase Separation in Pure and La-Doped BiFeO3 Films Prepared by Sol–Gel MethodAlina V. Semchenko0Vitaly V. Sidsky1Igor Bdikin2Vladimir E. Gaishun3Svitlana Kopyl4Dmitry L. Kovalenko5Oleg Pakhomov6Sergei A. Khakhomov7Andrei L. Kholkin8Faculty of Physics and Information Technology, Francisk Skorina Gomel State University, 246019 Gomel, BelarusFaculty of Physics and Information Technology, Francisk Skorina Gomel State University, 246019 Gomel, BelarusTEMA, Department of Mechanical Engineering, University of Aveiro, 3810-193 Aveiro, PortugalFaculty of Physics and Information Technology, Francisk Skorina Gomel State University, 246019 Gomel, BelarusCICECO-Aveiro Institute of Materials, Department of Physics, University of Aveiro, 3810-193 Aveiro, PortugalFaculty of Physics and Information Technology, Francisk Skorina Gomel State University, 246019 Gomel, BelarusLaboratory for “Electro-and Magnetocaloric Materials and Structures”, ITMO University, 197101 St. Petersburg, RussiaFaculty of Physics and Information Technology, Francisk Skorina Gomel State University, 246019 Gomel, BelarusCICECO-Aveiro Institute of Materials, Department of Physics, University of Aveiro, 3810-193 Aveiro, Portugal <span style="color: windowtext;">Pure BiFeO<sub>3</sub> (BFO) and doped Bi<sub>0.9</sub>La<sub>0.1</sub>FeO<sub>3</sub> (BLFO) thin films were prepared on Pt/TiO<sub>2</sub>/SiO<sub>2</sub>/Si substrates by a modified sol–gel technique using a separate hydrolysis procedure. The effects of final crystallization temperature and La doping on the phase structure, film morphology, and nanoscale piezoelectric properties were investigated. La doping and higher crystallization temperature lead to an increase in the grain size and preferred (102) texture of the films. Simultaneously, a decrease in the average effective piezoelectric coefficient (about 2 times in La-doped films) and an increase in the area of surface non-polar phase (up to 60%) are observed. Phase separation on the films’ surface is attributed to either a second phase or to a non-polar perovskite phase at the surface. As compared with undoped BFO, La-doping leads to an increase in the average grain size and self-polarization that is important for future piezoelectric applications. It is shown that piezoelectric activity is directly related to the films’ microstructructure, thus emphasizing the role of annealing conditions and La-doping that is frequently used to decrease the leakage current in BFO-based materials.</span> https://www.mdpi.com/1996-1944/14/7/1694bismuth ferriteLa-dopingpiezoelectricitysol–gel |
| collection |
DOAJ |
| language |
English |
| format |
Article |
| sources |
DOAJ |
| author |
Alina V. Semchenko Vitaly V. Sidsky Igor Bdikin Vladimir E. Gaishun Svitlana Kopyl Dmitry L. Kovalenko Oleg Pakhomov Sergei A. Khakhomov Andrei L. Kholkin |
| spellingShingle |
Alina V. Semchenko Vitaly V. Sidsky Igor Bdikin Vladimir E. Gaishun Svitlana Kopyl Dmitry L. Kovalenko Oleg Pakhomov Sergei A. Khakhomov Andrei L. Kholkin Nanoscale Piezoelectric Properties and Phase Separation in Pure and La-Doped BiFeO3 Films Prepared by Sol–Gel Method Materials bismuth ferrite La-doping piezoelectricity sol–gel |
| author_facet |
Alina V. Semchenko Vitaly V. Sidsky Igor Bdikin Vladimir E. Gaishun Svitlana Kopyl Dmitry L. Kovalenko Oleg Pakhomov Sergei A. Khakhomov Andrei L. Kholkin |
| author_sort |
Alina V. Semchenko |
| title |
Nanoscale Piezoelectric Properties and Phase Separation in Pure and La-Doped BiFeO3 Films Prepared by Sol–Gel Method |
| title_short |
Nanoscale Piezoelectric Properties and Phase Separation in Pure and La-Doped BiFeO3 Films Prepared by Sol–Gel Method |
| title_full |
Nanoscale Piezoelectric Properties and Phase Separation in Pure and La-Doped BiFeO3 Films Prepared by Sol–Gel Method |
| title_fullStr |
Nanoscale Piezoelectric Properties and Phase Separation in Pure and La-Doped BiFeO3 Films Prepared by Sol–Gel Method |
| title_full_unstemmed |
Nanoscale Piezoelectric Properties and Phase Separation in Pure and La-Doped BiFeO3 Films Prepared by Sol–Gel Method |
| title_sort |
nanoscale piezoelectric properties and phase separation in pure and la-doped bifeo3 films prepared by sol–gel method |
| publisher |
MDPI AG |
| series |
Materials |
| issn |
1996-1944 |
| publishDate |
2021-03-01 |
| description |
<span style="color: windowtext;">Pure BiFeO<sub>3</sub> (BFO) and doped Bi<sub>0.9</sub>La<sub>0.1</sub>FeO<sub>3</sub> (BLFO) thin films were prepared on Pt/TiO<sub>2</sub>/SiO<sub>2</sub>/Si substrates by a modified sol–gel technique using a separate hydrolysis procedure. The effects of final crystallization temperature and La doping on the phase structure, film morphology, and nanoscale piezoelectric properties were investigated. La doping and higher crystallization temperature lead to an increase in the grain size and preferred (102) texture of the films. Simultaneously, a decrease in the average effective piezoelectric coefficient (about 2 times in La-doped films) and an increase in the area of surface non-polar phase (up to 60%) are observed. Phase separation on the films’ surface is attributed to either a second phase or to a non-polar perovskite phase at the surface. As compared with undoped BFO, La-doping leads to an increase in the average grain size and self-polarization that is important for future piezoelectric applications. It is shown that piezoelectric activity is directly related to the films’ microstructructure, thus emphasizing the role of annealing conditions and La-doping that is frequently used to decrease the leakage current in BFO-based materials.</span> |
| topic |
bismuth ferrite La-doping piezoelectricity sol–gel |
| url |
https://www.mdpi.com/1996-1944/14/7/1694 |
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