Dielectric properties of Bismuth Titanate densified by Spark Plasma Sintering and Pressureless Sintering

Robles, Joel O. Herrera; González, Claudia A. Rodríguez; Torre, S.D. De la; Cobas, Luis Edmundo Fuentes; García-Casillas, Perla E.; Camacho‐Montes, H.

doi:10.1016/j.jallcom.2012.01.053

Cited by 13 publications

(6 citation statements)

References 17 publications

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“…Bismuth titanate compounds (BTOs), such as Bi 4 Ti 3 O 12 and Bi 2 Ti 2 O 7 , are the simplest members of the Aurivillius family, which consist of (Bi 2 O 2 ) 2+ sheets alternating with (Bi 2 Ti 3 O 10 ) 2− pseudo-perovskite layers [1,2]. Due to this particular structure, BTO compounds exhibit interesting physical properties such as ferroelectricity, high Curie temperature (675 • C) [2][3][4][5][6][7], and a band gap of 3.08 eV, depending on the morphology and synthesis route [8,9], among others. These properties enable a wide spectrum of technological applications, e.g., in catalysis [8][9][10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Bi4Ti3O12 Nanoparticles Obtained via Pulsed Laser Ablation in Liquids

García-Quiñonez,

Colorado-Garrido,

Collado-Hernández

et al. 2023

Materials

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Bismuth titanate (BTO) nanoparticles were obtained by pulsed laser ablation in liquid media (PLAL). Distilled water, ethanol, isopropanol, and acetone were used as media for laser ablation experiments, in which the colloidal solutions were obtained. Laser ablation was carried out using the second harmonic and fundamental wavelength of a pulsed Nd:YAG laser (532 nm and 1064 nm, respectively) with laser fluences of 25 and 12 mJ/cm2, respectively. Transmission electron microscopy was utilized for morphological characterization. BTO nanoparticles obtained have spherical shapes with orthorhombic structure and the average size distribution depended on the liquid media nature. In alcohols, BTO NPs were spherical with a carbon layer around them. X-ray diffraction, UV-Vis absorption spectra, and X-ray photoelectron spectroscopy were used to confirm the structural, optical, and elemental properties of the ablated products. The presented results show that PLAL is a viable technique for the synthesis of high-quality BTO nanoparticles with enhanced optical properties for possible applications in photocatalysis.

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Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Bi4Ti3O12 Nanoparticles Obtained via Pulsed Laser Ablation in Liquids

García-Quiñonez,

Colorado-Garrido,

Collado-Hernández

et al. 2023

Materials

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“…SPS has been often used for processing dielectric ceramics, although it may cause structural disorder [13] that can also affect the dielectric properties [12,14]. The SPS process is fast (usually completed within minutes) and can successfully hinder grain growth in dielectric ceramics [15]. By applying mechanical pressure during an appropriate thermal cycle, fully dense ceramics with fine grain size between 50 and 100 nm can be obtained [16].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Pressure-Assisted Sintering of CaCu3Ti4O12 Dielectrics

et al. 2021

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In this paper, we examined the dielectric properties of CaCu3Ti4O12 (CCTO) ceramics fabricated by various routes and discussed the most important conditions affecting their dielectric behavior. We prepared feedstock powder using a molten salt route and compared it with a commercial powder. Both powders were sintered using SPS. For some samples, annealing was applied after sintering. Other samples were obtained by high-pressure forming and conventional sintering, using both powders. Phase composition, porosity and microhardness were evaluated in comparison with the literature. The results showed that a sintering temperature just below or equal to 1000 °C should be set for the SPS process. However, the best dielectric characteristics were obtained in samples prepared by high-pressure forming and conventional sintering, which showed a relative permittivity of 22,000 and a loss tangent of 0.13 at 1 MHz.

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“…The textured bismuth titanate (BiT) has better electrical properties along axis, i.e., in the direction of the preferred orientation [13]. Spark plasma sintering (SPS) allows very fast heating rates, very short holding time, and the possibility to obtain high dense samples at lower temperatures than the most sintering techniques [14]. Therefore, it is expected that the application of SPS technique in BNKT ceramics could suppress the volatilization of Bi during sintering [15,16].…”

Section: Introductionmentioning

confidence: 99%

Effect of the sintering technique on the ferroelectric and d33 piezoelectric coefficients of Bi0.5(Na0.84K0.16)0.5TiO3 ceramic

et al. 2019

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In the search of lead-free piezoelectric materials, ceramic processing techniques offer potential tools to increase the piezoelectric and ferroelectric properties in addition to new chemical compositions. Powders of pure BNKT16 (Bi 0.5 (Na 0.84 K 0.16 ) 0.5 TiO 3 ) phase were synthesized by sol-gel method with a low crystallization temperature (750 ℃ ). Ceramic samples were sintered by pressureless sintering (PLS), sinter-forging (SF), and spark plasma sintering (SPS) techniques. Structural, morphological, and chemical characterizations were performed by XRD, Raman, EDS, and SEM. Sintered samples by PLS and SF exhibit rod-like grains associated to bismuth volatility. The highest remanent polarization (11.05 µC/cm 2 ), coercive field (26.2 kV/mm), and piezoelectric coefficient (165 pC/N) were obtained for SF sample. The piezoresponse force microscopy (PFM) analysis shows that the crystallites at the nanoscale exhibit piezoelectric phenomenon and the highest piezoelectric response is reported for PLS sample. The presence of the rhombohedral phase, the increase in grain and crystallite size, and the oriented rod-like inclusions favoring the crystallographic texture are facts that enhance the piezoelectric coefficient for BNKT16 piezoceramics.

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Dielectric properties of Bismuth Titanate densified by Spark Plasma Sintering and Pressureless Sintering

Cited by 13 publications

References 17 publications

Synthesis and Characterization of Bi4Ti3O12 Nanoparticles Obtained via Pulsed Laser Ablation in Liquids

Synthesis and Characterization of Bi4Ti3O12 Nanoparticles Obtained via Pulsed Laser Ablation in Liquids

Synthesis and Pressure-Assisted Sintering of CaCu3Ti4O12 Dielectrics

Effect of the sintering technique on the ferroelectric and d33 piezoelectric coefficients of Bi0.5(Na0.84K0.16)0.5TiO3 ceramic

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