Raman Spectra of Bismuth Titanate Ceramics

Bismuth titanate is a typical layer-structured ferroelectric material and belongs to the Aurivilius type-structure compounds family. A bismuth titanate ceramic material could be obtained by mechanically activated synthesis after thermal treatment at a temperature slightly lower than in conventional solid-state reaction. In this case bismuth titanate was prepared through mechanochemical synthesis starting from bismuth oxide and titanium oxide in rutile form. The mixture of oxides was milled in a zirconium oxide jar in a planetary ball-mill in intervals from 1 to 12 hours. The ratio of powders to zirconium oxide balls during milling was 1:20. Bismuth titanate was formed after 1 h. The Raman spectroscopy analysis was performed.

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Mechanochemical Synthesis of Bi4Ti3O12

Materials Science Forum ◽

10.4028/www.scientific.net/msf.518.125 ◽

2006 ◽

Vol 518 ◽

pp. 125-130 ◽

Cited By ~ 2

Author(s):

Z.Ž. Lazarević ◽

B.D. Stojanović ◽

José Arana Varela

Keyword(s):

Mechanochemical Synthesis ◽

Bismuth Titanate ◽

Crystal Form ◽

High Energy ◽

X Ray Diffraction ◽

Conventional Solid State Reaction ◽

Powder Morphology ◽

Air Atmosphere ◽

Energy Ball ◽

Titanate Ceramics

Our efforts were directed to the preparation of bismuth titanate – Bi4Ti3O12 (BIT) by mechanically assisted synthesis. The mechanical activation was applied to prepare bismuth titanate, Bi4Ti3O12, from bismuth oxide, Bi2O3, and titanium oxide, TiO2 (in an anatase crystal form). Mechanochemical synthesis was performed in a planetary ball mill in air atmosphere. Bismuth titanate ceramics was obtained by sintering at 1000 oC. The formation of Bi4Ti3O12 in the sintered samples was confirmed by X-ray diffraction analysis. Scanning electron microscopy, SEM, was used to study the particle size and powder morphology. The obtained results indicate that Bi4Ti3O12 from the powder synthesized by high-energy ball milling exhibits good sinterability, showing advantage of the mechanochemical process over conventional solid-state reaction.

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ELECTROMECHANICAL CHARACTERIZATION OF LANTHANUM-DOPED SODIUM BISMUTH TITANATE CERAMICS

Modern Physics Letters B ◽

10.1142/s0217984906010664 ◽

2006 ◽

Vol 20 (09) ◽

pp. 475-480 ◽

Cited By ~ 1

Author(s):

M. APARNA ◽

M. RAGHAVENDER ◽

G. PRASAD ◽

G. S. KUMAR

Keyword(s):

Electromechanical Coupling ◽

Bismuth Titanate ◽

Coupling Coefficients ◽

Electromechanical Properties ◽

Sodium Bismuth Titanate ◽

Resonant Frequencies ◽

Lanthanum Doping ◽

Titanate Ceramics ◽

Titanate Ceramic

The effect of lanthanum doping on the electromechanical properties of lanthanum-doped sodium bismuth titanate was studied. The ferroelectric system under investigation was Na 1/2( La x Bi 1-x)1/2 TiO 3 ceramics, with x=0, 0.1, 0.15 and 0.2. Admittance measurements were carried out in the frequency range of 100 Hz to 13 MHz and in the temperature range from room temperature to 550°C. Combined impedance and admittance spectroscopy was used to analyze admittance data. The electromechanical parameters were calculated from the resonant and anti-resonant frequencies obtained from vector admittance plots. The electromechanical coefficients for pure sodium bismuth titanate ceramic samples were found to be much larger than the reported values. Also, it was observed that lanthanum-doping decreased the values of electromechanical coupling coefficients.

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Negative Resistance Behavior of Ferroelectric Bismuth Titanate Ceramics at Low Field

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.492.234 ◽

2011 ◽

Vol 492 ◽

pp. 234-237 ◽

Cited By ~ 3

Author(s):

X.A. Mei ◽

M. Chen ◽

R. F. Liu ◽

Y.H. Sun ◽

J. Liu

Keyword(s):

Electrical Transport ◽

Bismuth Titanate ◽

Differential Resistance ◽

Negative Resistance ◽

Voltage Characteristic ◽

Current Voltage Characteristic ◽

Conventional Solid State Reaction ◽

Low Field ◽

Current Voltage ◽

Titanate Ceramics

Ferroelectric Bi4Ti3O12ceramics are fabricated by conventional solid-state reaction process. The current-voltage characteristic of Bi4Ti3O12sample exhibits a voltage-controlled negative differential resistance behavior at low field (E≤100V/mm), and an obvious PTC effect appears at around 100°C on the resistance-temperature curve. Based on conducting filament model about electrical transport, instead of Heywang-Jonker model, the experimental results of Bi4Ti3O12ceramics are suitably explained.

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Effect of synthesis route on the microstructure of SiO2 doped bismuth titanate ceramics

Processing and Application of Ceramics ◽

10.2298/pac0904171k ◽

2009 ◽

Vol 3 (4) ◽

pp. 171-175 ◽

Cited By ~ 3

Author(s):

Elena Kashchieva ◽

Milena Krapchanska ◽

Stanislav Slavov ◽

Yanko Dimitriev

Keyword(s):

Solid State ◽

Solid State Reaction ◽

Bismuth Titanate ◽

Batch Composition ◽

Melt Quenching ◽

Dense Microstructure ◽

Binary Sample ◽

Methods Of Synthesis ◽

Quenching Method ◽

Titanate Ceramics

Synthesis and characterization of SiO2 doped bismuth titanate ceramics were investigated. Four investigated compositions belonging to the system Bi2O3-TiO2-SiO2 are located in the section Bi4Ti3O12-SiO2, near by it and in the binary Bi2O3-TiO2 system. Melt quenching was applied for synthesis of SiO2 doped bismuth titanate ceramics and for the sample 40Bi2O3?60TiO2. The binary sample 70Bi2O3?30TiO2 is prepared by gradient heating of bulk materials near the liquidus temperature (modified solid state reaction). The influence of the thermal treatment on the phase formation and microstructure was evaluated using XRD, EDS and SEM. The binary samples prepared by solid state reaction at low temperature (1000?C) possess poly-phased dense microstructure, while secondary crystallization combined with porosity formation is typical for the sample obtained at high temperature (1150?C). The ternary Bi2O3-TiO2-SiO2 samples, obtained by supercooling of the melts down to room temperature, are thermally treated at 700, 800?C. They consist of elongated crystals in amorphous matrix. The crystals have lower Bi2O3-content and higher TiO2-content than the nominal batch composition. The XRD data show that the main crystalline phases in the ceramics produced by melt quenching method and solid state reaction are ?-Bi2O3, Bi4Ti3O12 and one unknown new phase. It is proved that the applied methods of synthesis are suitable for generation of different microstructures in the bulk SiO2 doped bismuth titanate ceramics, which is promising basis for modification of their electrical properties. .

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Raman spectroscopy analysis utilized to identify stress induced leakage from power and high speed technologies using deep trench isolation schemes

2017 40th International Convention on Information and Communication Technology, Electronics and Microelectronics (MIPRO) ◽

10.23919/mipro.2017.7966537 ◽

2017 ◽

Author(s):

Courtney Parker ◽

Thanas Budri

Keyword(s):

Raman Spectroscopy ◽

High Speed ◽

Spectroscopy Analysis ◽

Deep Trench ◽

Trench Isolation

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Synthesis and Na+ Ion Conductivity of Stoichiometric Na3Zr2Si2PO12 by Liquid-Phase Sintering with NaPO3 Glass

Materials ◽

10.3390/ma14143790 ◽

2021 ◽

Vol 14 (14) ◽

pp. 3790

Author(s):

Yongzheng Ji ◽

Tsuyoshi Honma ◽

Takayuki Komatsu

Keyword(s):

Solid State ◽

Liquid Phase ◽

Sintering Temperature ◽

Liquid Phase Sintering ◽

Ion Conductivity ◽

X Ray Diffraction ◽

Conventional Solid State Reaction ◽

X Ray ◽

Sintering Time ◽

Lower Activation

Sodium super ionic conductor (NASICON)-type Na3Zr2Si2PO12 (NZSP) with the advantages of the high ionic conductivity, stability and safety is one of the most famous solid-state electrolytes. NZSP, however, requires the high sintering temperature about 1200 °C and long sintering time in the conventional solid-state reaction (SSR) method. In this study, the liquid-phase sintering (LPS) method was applied to synthesize NZSP with the use of NaPO3 glass with a low glass transition temperature of 292 °C. The formation of NZSP was confirmed by X-ray diffraction analyses in the samples obtained by the LPS method for the mixture of Na2ZrSi2O7, ZrO2, and NaPO3 glass. The sample sintered at 1000 °C for 10 h exhibited a higher Na+ ion conductivity of 1.81 mS/cm at 100 °C and a lower activation energy of 0.18 eV compared with the samples prepared by the SSR method. It is proposed that a new LPE method is effective for the synthesis of NZSP and the NaPO3 glass has a great contribution to the Na+ diffusion at the grain boundaries.

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Use of WetSEM® capsules for convenient multimodal scanning electron microscopy, energy dispersive X-ray analysis, and micro Raman spectroscopy characterisation of technetium oxides

Journal of Radioanalytical and Nuclear Chemistry ◽

10.1007/s10967-021-07737-5 ◽

2021 ◽

Author(s):

D. J. Bailey ◽

M. C. Stennett ◽

J. Heo ◽

N. C. Hyatt

Keyword(s):

Raman Spectroscopy ◽

Low Cost ◽

Powder Materials ◽

Spectroscopy Analysis ◽

X Ray ◽

Micro Raman Spectroscopy ◽

Hazard And Risk ◽

Sem Imaging ◽

General User ◽

532 Nm

AbstractSEM–EDX and Raman spectroscopy analysis of radioactive compounds is often restricted to dedicated instrumentation, within radiological working areas, to manage the hazard and risk of contamination. Here, we demonstrate application of WetSEM® capsules for containment of technetium powder materials, enabling routine multimodal characterisation with general user instrumentation, outside of a controlled radiological working area. The electron transparent membrane of WetSEM® capsules enables SEM imaging of submicron non-conducting technetium powders and acquisition of Tc Lα X-ray emission, using a low cost desktop SEM–EDX system, as well as acquisition of good quality μ-Raman spectra using a 532 nm laser.

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