Relaxor behavior of Barium Bismuth Titanate
Апстракт
Bi-based Aurivillius family of compounds have received considerable attention as the materials for ferroelectric random access memory (FRAM) because of their low operating voltage, fast switching speed, large remnant polarization, low coercive field, superior polarization fatigue resistant characteristics and high. Relaxor ferroelectrics are attractive for a wide range of applications owing to their high dielectric and piezoelectric responses over a wide range of temperaturea.
BaBi4Ti4O15 [BBiT] was prepared by solid state reaction from different starting oxides.The microstructure of is BaBi4Ti4O15 dominated by the presence of rounded edges platelet-like grains up to 1 μm size and 0.2 μm thickness. The rounded edges of grains could be attributed to liquid phase sintering. The dielectric measurements results give an evidence of a diffuse phase transition accompanied by a relaxation of the permittivity in frequency interval from 1.21 kHz to 1 MHz. This behavior is typical for relaxor... ferroelectric. A modified Curie - Weiss relationship is used to study the diffuseness behavior of a ferroelectric phase transition. The value of γ is found to be 1.88, which reveals the near-relaxor nature of BBiT ceramics. An empirical Vogel - Fülcher relationship is used to account the dielectric relaxation nature in relaxor ferroelectrics. According to that model, it is considered that relaxor behavior of BBiT could attribute to the disorder of Ba2+ from perovskite slabs ((BaBi2)Ti4O13)2- with Bi3+ from the (Bi2O2)2+ layer.
In the present impedance investigations, only a single semicircle with a high frequency side passing through the origin is observed in the 700-1050 K temperature range. The semicircle can be ascribing to the grain component for all investigation temperature. At the higher temperatures, along with the semicircle a small tail is present in the low frequency side which could indicate the electrode-grain interface which serves as traps for space charges. The conductivity data follow the Arhenius law quite well in temperature regions 700-1050 K. The calculated values of activation energy Ea, by linear fitting of the data points is 1.02 eV. The value of Ea for conduction suggested possibility that the conduction in the high temperature range was ionic due to oxygen vacancies.
Кључне речи:
Aurivillius family of compounds / Relaxor ferroelectrics / Vogel - Fülcher relationship / Curie - Weiss relationship / activation energyИзвор:
Joint Workshop of the COST MP0904 Action, 12 August, 2010, Edinburgh, United Kingdom, Programme and book of abstracts, p 25, 2010Издавач:
- Joint Workshop of the COST MP0904 Action, 12 August, 2010, Edinburgh, United Kingdom, Programme and book of abstracts, p 25
Институција/група
Institut za multidisciplinarna istraživanjaTY - CONF AU - Bobić, Jelena AU - Vijatović Petrović, Mirjana AU - Greičius, Simonas AU - Banys, Juras AU - Stojanović, Biljana PY - 2010 UR - http://rimsi.imsi.bg.ac.rs/handle/123456789/2886 AB - Bi-based Aurivillius family of compounds have received considerable attention as the materials for ferroelectric random access memory (FRAM) because of their low operating voltage, fast switching speed, large remnant polarization, low coercive field, superior polarization fatigue resistant characteristics and high. Relaxor ferroelectrics are attractive for a wide range of applications owing to their high dielectric and piezoelectric responses over a wide range of temperaturea. BaBi4Ti4O15 [BBiT] was prepared by solid state reaction from different starting oxides.The microstructure of is BaBi4Ti4O15 dominated by the presence of rounded edges platelet-like grains up to 1 μm size and 0.2 μm thickness. The rounded edges of grains could be attributed to liquid phase sintering. The dielectric measurements results give an evidence of a diffuse phase transition accompanied by a relaxation of the permittivity in frequency interval from 1.21 kHz to 1 MHz. This behavior is typical for relaxor ferroelectric. A modified Curie - Weiss relationship is used to study the diffuseness behavior of a ferroelectric phase transition. The value of γ is found to be 1.88, which reveals the near-relaxor nature of BBiT ceramics. An empirical Vogel - Fülcher relationship is used to account the dielectric relaxation nature in relaxor ferroelectrics. According to that model, it is considered that relaxor behavior of BBiT could attribute to the disorder of Ba2+ from perovskite slabs ((BaBi2)Ti4O13)2- with Bi3+ from the (Bi2O2)2+ layer. In the present impedance investigations, only a single semicircle with a high frequency side passing through the origin is observed in the 700-1050 K temperature range. The semicircle can be ascribing to the grain component for all investigation temperature. At the higher temperatures, along with the semicircle a small tail is present in the low frequency side which could indicate the electrode-grain interface which serves as traps for space charges. The conductivity data follow the Arhenius law quite well in temperature regions 700-1050 K. The calculated values of activation energy Ea, by linear fitting of the data points is 1.02 eV. The value of Ea for conduction suggested possibility that the conduction in the high temperature range was ionic due to oxygen vacancies. PB - Joint Workshop of the COST MP0904 Action, 12 August, 2010, Edinburgh, United Kingdom, Programme and book of abstracts, p 25 C3 - Joint Workshop of the COST MP0904 Action, 12 August, 2010, Edinburgh, United Kingdom, Programme and book of abstracts, p 25 T1 - Relaxor behavior of Barium Bismuth Titanate UR - https://hdl.handle.net/21.15107/rcub_rimsi_2886 ER -
@conference{ author = "Bobić, Jelena and Vijatović Petrović, Mirjana and Greičius, Simonas and Banys, Juras and Stojanović, Biljana", year = "2010", abstract = "Bi-based Aurivillius family of compounds have received considerable attention as the materials for ferroelectric random access memory (FRAM) because of their low operating voltage, fast switching speed, large remnant polarization, low coercive field, superior polarization fatigue resistant characteristics and high. Relaxor ferroelectrics are attractive for a wide range of applications owing to their high dielectric and piezoelectric responses over a wide range of temperaturea. BaBi4Ti4O15 [BBiT] was prepared by solid state reaction from different starting oxides.The microstructure of is BaBi4Ti4O15 dominated by the presence of rounded edges platelet-like grains up to 1 μm size and 0.2 μm thickness. The rounded edges of grains could be attributed to liquid phase sintering. The dielectric measurements results give an evidence of a diffuse phase transition accompanied by a relaxation of the permittivity in frequency interval from 1.21 kHz to 1 MHz. This behavior is typical for relaxor ferroelectric. A modified Curie - Weiss relationship is used to study the diffuseness behavior of a ferroelectric phase transition. The value of γ is found to be 1.88, which reveals the near-relaxor nature of BBiT ceramics. An empirical Vogel - Fülcher relationship is used to account the dielectric relaxation nature in relaxor ferroelectrics. According to that model, it is considered that relaxor behavior of BBiT could attribute to the disorder of Ba2+ from perovskite slabs ((BaBi2)Ti4O13)2- with Bi3+ from the (Bi2O2)2+ layer. In the present impedance investigations, only a single semicircle with a high frequency side passing through the origin is observed in the 700-1050 K temperature range. The semicircle can be ascribing to the grain component for all investigation temperature. At the higher temperatures, along with the semicircle a small tail is present in the low frequency side which could indicate the electrode-grain interface which serves as traps for space charges. The conductivity data follow the Arhenius law quite well in temperature regions 700-1050 K. The calculated values of activation energy Ea, by linear fitting of the data points is 1.02 eV. The value of Ea for conduction suggested possibility that the conduction in the high temperature range was ionic due to oxygen vacancies.", publisher = "Joint Workshop of the COST MP0904 Action, 12 August, 2010, Edinburgh, United Kingdom, Programme and book of abstracts, p 25", journal = "Joint Workshop of the COST MP0904 Action, 12 August, 2010, Edinburgh, United Kingdom, Programme and book of abstracts, p 25", title = "Relaxor behavior of Barium Bismuth Titanate", url = "https://hdl.handle.net/21.15107/rcub_rimsi_2886" }
Bobić, J., Vijatović Petrović, M., Greičius, S., Banys, J.,& Stojanović, B.. (2010). Relaxor behavior of Barium Bismuth Titanate. in Joint Workshop of the COST MP0904 Action, 12 August, 2010, Edinburgh, United Kingdom, Programme and book of abstracts, p 25 Joint Workshop of the COST MP0904 Action, 12 August, 2010, Edinburgh, United Kingdom, Programme and book of abstracts, p 25.. https://hdl.handle.net/21.15107/rcub_rimsi_2886
Bobić J, Vijatović Petrović M, Greičius S, Banys J, Stojanović B. Relaxor behavior of Barium Bismuth Titanate. in Joint Workshop of the COST MP0904 Action, 12 August, 2010, Edinburgh, United Kingdom, Programme and book of abstracts, p 25. 2010;. https://hdl.handle.net/21.15107/rcub_rimsi_2886 .
Bobić, Jelena, Vijatović Petrović, Mirjana, Greičius, Simonas, Banys, Juras, Stojanović, Biljana, "Relaxor behavior of Barium Bismuth Titanate" in Joint Workshop of the COST MP0904 Action, 12 August, 2010, Edinburgh, United Kingdom, Programme and book of abstracts, p 25 (2010), https://hdl.handle.net/21.15107/rcub_rimsi_2886 .