Influence of the Nd3+ ions content on the FTIR and the visible up-conversion luminescence properties of nano-structure BaTiO3, prepared by sol–gel technique

Darwish, Abdelfattah; Badr, Y.; Shaarawy, M. El; Shash, N.M.; Battisha, I. K.

doi:10.1016/j.jallcom.2009.09.021

Cited by 46 publications

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“…This peak is due to the vibration of the bond between titanium and oxygen (Ti-O bond) [30][31][32][33]. Region ii, corresponds to a peak at 450 cm -1 approximately, which is caused by vibrations between metal atoms and oxygen (Ti-O and Ba-O bonds) [30,32,34]. Both previous referred regions are not clearly visible in Figure 3 as from their nature these peaks are difficult to be detected [34].…”

Section: X-ray Diffraction (Xrd) Characterizationmentioning

confidence: 99%

“…Region i, is the most important peak for barium titanate and corresponds to wavelength range between 530-700 cm -1 (usually between 560-680 cm -1 ). This peak is due to the vibration of the bond between titanium and oxygen (Ti-O bond) [30][31][32][33]. Region ii, corresponds to a peak at 450 cm -1 approximately, which is caused by vibrations between metal atoms and oxygen (Ti-O and Ba-O bonds) [30,32,34].…”

Section: X-ray Diffraction (Xrd) Characterizationmentioning

confidence: 99%

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Barium titanate/polyester resin nanocomposites: Development, structure-properties relationship and energy storage capability

Asimakopoulos¹,

Psarras²,

Zoumpoulakis³

2014

Express Polym. Lett.

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Abstract. Nanocomposite materials based on two different types of polyester matrix (a commercial type and a laboratory produced one) with embedded barium titanate nano-particles were developed and characterized. Structural and morphological characteristics of the produced composite specimens were studied via X-ray diffraction, Fourier transformation infra red spectroscopy, and scanning electron microscopy. Thermal, mechanical and electrical performance was examined via differential scanning calorimetry, bending and shear strength tests, and broadband dielectric spectroscopy, respectively. Mechanical strength appears to reduce with the increase of filler content. Commercial polyester's composites exhibit brittle behaviour, while laboratory polyester's composites exhibit an elastomeric performance. Dielectric data reveal the presence of four relaxation processes, which are attributed to motion of small parts of the polymer chain (!-mode), re-arrangement of polar side groups ("-mode), glass to rubber transition of the polymer matrix (#-mode) and Interfacial Polarization between the systems' constituents. Finally, the energy storing efficiency of the systems was examined by calculating the density of energy. Vol.8, No.9 (2014) 692-707 Available online at www.expresspolymlett.com DOI: 10.3144/expresspolymlett.2014.72 * Corresponding author, e-mail: G.C.Psarras@upatras.gr © BME-PT An outstanding position in the group of electroceramics is given to composite materials based on barium titanate. Barium titanate is a wide band gap semiconductive ferroelectric material with perovskite structure which has been of practical importance for over 60 years due to its specific electrical properties. Barium titanate's great significance is expressed in its applications, which include ceramic capacitors, PTCR thermistors (positive temperature coefficient resistors/thermistors or posistors), piezoelectric sensors, optoelectronic devices, transducers, actuators etc. [4][5][6][7][8][9][10]. Furthermore, it is being applied as a capacitive material in dynamic random access memories (DRAM) in integrated circuits. DRAM applications require both high dielectric constant and good insulating properties [10]. Semiconductor memories such as dynamic random access memories (DRAM's) and static random access memories (SRAM's) currently dominate the market. However, the disadvantage of these memories is that they are volatile, i.e. the stored information is lost when the power fails. The non-volatile memories available at this time include complementary metal oxide semiconductors (CMOS) with battery backup and electrically erasable read only memories (EEPROM's). These non-volatile memories are very expensive. The main advantages offered by ferroelectric random access memories (FRAM's) include non-volatility and radiation hardened compatibility with CMOS and GaAs circuitry, high speed (30ns cycle time for read/erase/rewrite) and high density (4 (µm) 2 /cell size) [11]. Up to now, the most important utility of BaTiO 3 / polymer composites is ...

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Section: X-ray Diffraction (Xrd) Characterizationmentioning

confidence: 99%

Section: X-ray Diffraction (Xrd) Characterizationmentioning

confidence: 99%

Barium titanate/polyester resin nanocomposites: Development, structure-properties relationship and energy storage capability

Asimakopoulos¹,

Psarras²,

Zoumpoulakis³

2014

Express Polym. Lett.

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“…The BaTiO 3 phase is confirmed by the peak at 510 cm −1 , which is related to Ti-O absorption in the barium titanate lattice [45]. A strong absorption at 1450 cm −1 can be observed for the sample prepared with a CW : BT ratio of 25 : 2, which-as well as the ones at 1750 and 850 cm -is due to asymmetric stretching of the carbonate ions (CO 3 2− ) of BaCO 3 [45]. BaCO 3 could not be detected by XRD in the 25 : 2 sample.…”

Section: Resultsmentioning

confidence: 90%

An Eco-Friendly Method of BaTiO₃ Nanoparticle Synthesis Using Coconut Water

Gomes

Magalhães

Paschoal

et al. 2018

Journal of Nanomaterials

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BaTiO 3 nanoparticles were successfully synthesized by a new coconut water-based sol-gel method using Ba(CH 3 COO) 2 and TiCl 3 as the starting salts. The influence of the amount of coconut water and calcination conditions on the barium titanate crystallization was investigated. The resulting nanoparticles were characterized by thermogravimetric and differential thermal analysis, X-ray diffraction, scanning electron microscopy, and Raman and Fourier transform infrared (FTIR) spectroscopies. The ferroelectric tetragonal single phase of BaTiO 3 was obtained in samples prepared with a ratio of coconut water volume (mL)/BaTiO 3 mass (g) of 25 : 2 and 30 : 2, calcined at 1100°C, which was confirmed by XRD measurements. Crystallites with an average size of about 31 nm for both samples were obtained, and microscopy images revealed the presence of particles in the range of 40 to 60 nm. Raman and FTIR spectra confirmed the dominant tetragonal phase of BaTiO 3 , meanwhile traces of BaCO 3 were identified in FTIR spectra.

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“…On the other hand, it is known that all the above mentioned properties are basically influenced by the temperature and the frequency in perovskite structure-type materials. Therefore, the temperature dependence of the dielectric permittivity for some frequencies has been widely studied and reported as an important feature in order to determine the temperatures and character of the phase transition in ferroelectric materials [14][15][16]. To the best of our knowledge, no works focusing on the study of the dielectric properties in the BSxT system in a very wide frequency interval, and for different temperatures of measure, have been reported in the literature, but only for few frequencies.…”

Section: Introductionmentioning

confidence: 99%

Complex impedance, dielectric relaxation and electrical conductivity studies of Ba_1-xSr_xTiO₃ceramics

Elbasset

S²,

Abdi

et al. 2017

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. In this work, we prepared series of Ba 1-x Sr x TiO 3 (BS x T) powders, with different strontium concentrations (x = 0, 0.025, 0.75, 0.10, 0.125 and 0.15), by the sol-gel method. The variation of structure in the Ba1-xSrxTiO3 system was analyzed using XRD and Raman techniques. The field dependence of dielectric relaxation and conductivity was measured over a wide frequency range from room temperature to 400 °C. The activation energy, calculated from the thermal variation of the conductivity for different frequencies, showed that the Sr has significant effects on the properties of BaTiO 3 . Relaxation times extracted using the imaginary part of the complex impedance (Z''(ω)) and the modulus (M''(ω)) were also found to follow the Arrhenius law and showed an anomaly around the phase transition temperature.

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Influence of the Nd3+ ions content on the FTIR and the visible up-conversion luminescence properties of nano-structure BaTiO3, prepared by sol–gel technique

Cited by 46 publications

References 20 publications

Barium titanate/polyester resin nanocomposites: Development, structure-properties relationship and energy storage capability

Barium titanate/polyester resin nanocomposites: Development, structure-properties relationship and energy storage capability

An Eco-Friendly Method of BaTiO₃ Nanoparticle Synthesis Using Coconut Water

Complex impedance, dielectric relaxation and electrical conductivity studies of Ba_1-xSr_xTiO₃ceramics

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Influence of the Nd3+ ions content on the FTIR and the visible up-conversion luminescence properties of nano-structure BaTiO3, prepared by sol–gel technique

Cited by 46 publications

References 20 publications

Barium titanate/polyester resin nanocomposites: Development, structure-properties relationship and energy storage capability

Barium titanate/polyester resin nanocomposites: Development, structure-properties relationship and energy storage capability

An Eco-Friendly Method of BaTiO3 Nanoparticle Synthesis Using Coconut Water

Complex impedance, dielectric relaxation and electrical conductivity studies of Ba1-xSrxTiO3ceramics

Contact Info

Product

Resources

About

An Eco-Friendly Method of BaTiO₃ Nanoparticle Synthesis Using Coconut Water

Complex impedance, dielectric relaxation and electrical conductivity studies of Ba_1-xSr_xTiO₃ceramics