TUNING OF FERROELECTRIC PROPERTIES OF BiFeO3 CERAMICS BY CATION SUBSTITUTIONS AT Bi-SITE AND Fe-SITE
Аутори
Radojković, AleksandarLuković Golić, Danijela
JOVIĆ ORSINI, Nataša
Ćirković, Jovana
Nikolić, Nenad
Branković, Zorica
Branković, Goran
Конференцијски прилог (Објављена верзија)
Метаподаци
Приказ свих података о документуАпстракт
In this study, we tried various cation substitutions at Bi-site (La3+, Eu3+) and Fesite (Nb5+
, Zr4+
) to explore their possible synergism and improvement of the
ferroelectric properties of bismuth ferrite. The cations with higher valence ought to
suppress the formation of structural defects during syntheses, such as oxygen and
bismuth vacancies. These defects are responsible for high leakage currents and low
breakdown voltages characteristic of pure BiFeO3. On the other hand, rare earth
cations at the Bi-site usually enable densification of the ceramics at a broader range
of temperatures, preventing bismuth loss and formation of defects and secondary
phases during sintering. However, dopant concentrations above 10–15 mol% may
give rise to a transition from polar, rhombohedral (R3c) to non-polar, orthorhombic
(Pnma) symmetry.
Thus, we synthesized pure and selected compositions doped BiFeO3 by a hydroevaporation method and determined the optimal calcination temperature by th...ermal
analyses of the precursor powders. Then we characterized ceramics samples using
X-ray diffraction (XRD) analysis, scanning electron microscopy (SEM) and
polarization techniques. Although only 1 mol% Nb5+ decreased the leakage current,
it surprisingly deteriorated the ferroelectric properties of BiFeO3. Similar effect
exhibited the samples containing Zr4+ that showed no improvement compared with
undoped bismuth ferrite. On the contrary, La3+ and Eu3+ (incorporated at the Bi-site)
improved the ferroelectric properties as their concentrations increased, whereby the
samples doped with 15 mol% La exhibited higher remnant electric polarizations at
observed electric fields. The highest remnant electric polarization of 31.9 µC/cm2
at 150 kV/cm, was measured for Bi0.85La0.15Fe0.998Zr0.002O3, indicating the synergetic
effect of La3+ and Zr4+, which is limited to low Zr4+ concentrations.
Кључне речи:
multiferroics, bismuth ferrite, leakage current, remnant polarizationИзвор:
7th Conference of the Serbian Ceramic Society, 2023, 79-Издавач:
- Društvo za keramičke materijale Srbije
Финансирање / пројекти:
- Министарство науке, технолошког развоја и иновација Републике Србије, институционално финансирање - 200053 (Универзитет у Београду, Институт за мултидисциплинарна истраживања) (RS-MESTD-inst-2020-200053)
Институција/група
Institut za multidisciplinarna istraživanjaTY - CONF AU - Radojković, Aleksandar AU - Luković Golić, Danijela AU - JOVIĆ ORSINI, Nataša AU - Ćirković, Jovana AU - Nikolić, Nenad AU - Branković, Zorica AU - Branković, Goran PY - 2023 UR - http://rimsi.imsi.bg.ac.rs/handle/123456789/2386 AB - In this study, we tried various cation substitutions at Bi-site (La3+, Eu3+) and Fesite (Nb5+ , Zr4+ ) to explore their possible synergism and improvement of the ferroelectric properties of bismuth ferrite. The cations with higher valence ought to suppress the formation of structural defects during syntheses, such as oxygen and bismuth vacancies. These defects are responsible for high leakage currents and low breakdown voltages characteristic of pure BiFeO3. On the other hand, rare earth cations at the Bi-site usually enable densification of the ceramics at a broader range of temperatures, preventing bismuth loss and formation of defects and secondary phases during sintering. However, dopant concentrations above 10–15 mol% may give rise to a transition from polar, rhombohedral (R3c) to non-polar, orthorhombic (Pnma) symmetry. Thus, we synthesized pure and selected compositions doped BiFeO3 by a hydroevaporation method and determined the optimal calcination temperature by thermal analyses of the precursor powders. Then we characterized ceramics samples using X-ray diffraction (XRD) analysis, scanning electron microscopy (SEM) and polarization techniques. Although only 1 mol% Nb5+ decreased the leakage current, it surprisingly deteriorated the ferroelectric properties of BiFeO3. Similar effect exhibited the samples containing Zr4+ that showed no improvement compared with undoped bismuth ferrite. On the contrary, La3+ and Eu3+ (incorporated at the Bi-site) improved the ferroelectric properties as their concentrations increased, whereby the samples doped with 15 mol% La exhibited higher remnant electric polarizations at observed electric fields. The highest remnant electric polarization of 31.9 µC/cm2 at 150 kV/cm, was measured for Bi0.85La0.15Fe0.998Zr0.002O3, indicating the synergetic effect of La3+ and Zr4+, which is limited to low Zr4+ concentrations. PB - Društvo za keramičke materijale Srbije C3 - 7th Conference of the Serbian Ceramic Society T1 - TUNING OF FERROELECTRIC PROPERTIES OF BiFeO3 CERAMICS BY CATION SUBSTITUTIONS AT Bi-SITE AND Fe-SITE SP - 79 UR - https://hdl.handle.net/21.15107/rcub_rimsi_2386 ER -
@conference{ author = "Radojković, Aleksandar and Luković Golić, Danijela and JOVIĆ ORSINI, Nataša and Ćirković, Jovana and Nikolić, Nenad and Branković, Zorica and Branković, Goran", year = "2023", abstract = "In this study, we tried various cation substitutions at Bi-site (La3+, Eu3+) and Fesite (Nb5+ , Zr4+ ) to explore their possible synergism and improvement of the ferroelectric properties of bismuth ferrite. The cations with higher valence ought to suppress the formation of structural defects during syntheses, such as oxygen and bismuth vacancies. These defects are responsible for high leakage currents and low breakdown voltages characteristic of pure BiFeO3. On the other hand, rare earth cations at the Bi-site usually enable densification of the ceramics at a broader range of temperatures, preventing bismuth loss and formation of defects and secondary phases during sintering. However, dopant concentrations above 10–15 mol% may give rise to a transition from polar, rhombohedral (R3c) to non-polar, orthorhombic (Pnma) symmetry. Thus, we synthesized pure and selected compositions doped BiFeO3 by a hydroevaporation method and determined the optimal calcination temperature by thermal analyses of the precursor powders. Then we characterized ceramics samples using X-ray diffraction (XRD) analysis, scanning electron microscopy (SEM) and polarization techniques. Although only 1 mol% Nb5+ decreased the leakage current, it surprisingly deteriorated the ferroelectric properties of BiFeO3. Similar effect exhibited the samples containing Zr4+ that showed no improvement compared with undoped bismuth ferrite. On the contrary, La3+ and Eu3+ (incorporated at the Bi-site) improved the ferroelectric properties as their concentrations increased, whereby the samples doped with 15 mol% La exhibited higher remnant electric polarizations at observed electric fields. The highest remnant electric polarization of 31.9 µC/cm2 at 150 kV/cm, was measured for Bi0.85La0.15Fe0.998Zr0.002O3, indicating the synergetic effect of La3+ and Zr4+, which is limited to low Zr4+ concentrations.", publisher = "Društvo za keramičke materijale Srbije", journal = "7th Conference of the Serbian Ceramic Society", title = "TUNING OF FERROELECTRIC PROPERTIES OF BiFeO3 CERAMICS BY CATION SUBSTITUTIONS AT Bi-SITE AND Fe-SITE", pages = "79", url = "https://hdl.handle.net/21.15107/rcub_rimsi_2386" }
Radojković, A., Luković Golić, D., JOVIĆ ORSINI, N., Ćirković, J., Nikolić, N., Branković, Z.,& Branković, G.. (2023). TUNING OF FERROELECTRIC PROPERTIES OF BiFeO3 CERAMICS BY CATION SUBSTITUTIONS AT Bi-SITE AND Fe-SITE. in 7th Conference of the Serbian Ceramic Society Društvo za keramičke materijale Srbije., 79. https://hdl.handle.net/21.15107/rcub_rimsi_2386
Radojković A, Luković Golić D, JOVIĆ ORSINI N, Ćirković J, Nikolić N, Branković Z, Branković G. TUNING OF FERROELECTRIC PROPERTIES OF BiFeO3 CERAMICS BY CATION SUBSTITUTIONS AT Bi-SITE AND Fe-SITE. in 7th Conference of the Serbian Ceramic Society. 2023;:79. https://hdl.handle.net/21.15107/rcub_rimsi_2386 .
Radojković, Aleksandar, Luković Golić, Danijela, JOVIĆ ORSINI, Nataša, Ćirković, Jovana, Nikolić, Nenad, Branković, Zorica, Branković, Goran, "TUNING OF FERROELECTRIC PROPERTIES OF BiFeO3 CERAMICS BY CATION SUBSTITUTIONS AT Bi-SITE AND Fe-SITE" in 7th Conference of the Serbian Ceramic Society (2023):79, https://hdl.handle.net/21.15107/rcub_rimsi_2386 .