Synthesis of highly tetragonal BaTiO3 nanopowders by a two-step alkoxide–hydroxide route

Joung, Mi Ri; Kim, Jin-Seong; Song, Myung Eun; Choi, Jae Hong; Nahm, Sahn; Choi, Choon-Gi; Sung, Tae Hyun

doi:10.1016/j.jallcom.2011.06.052

Cited by 15 publications

(19 citation statements)

References 16 publications

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“…The amplified XRD patterns in the 2h range of 44-46°show that the peaks at around 45°become broader and broader as the R Ba/Ti value increases from 0.7 to 2.0, indicating a higher Ba/Ti ratio is helpful to form a tetragonal BaTiO 3 phase according to JCPDF no. 05-0626, in agreement with the literature results (Joung et al 2011), but the proper Ba/Ti ratio is 1.2, larger than which the amount of tetragonal BaTiO 3 phase decreases (Table S1). The morphology and particle-size distribution of the BaTiO 3 samples synthesized with various R Ba/Ti values via hydrothermal treatment at 200°C for 10 h ([NaOH] = 2.0 mol L -1 ) is shown in Fig.…”

Section: Effects Of Molar Ba/ti Ratiossupporting

confidence: 90%

“…There are seven obvious peaks at around 22.12, 31.52, 38.81, 45.17, 50.80, 56.10, and 65.76°, corresponding to the (100), (110), (111), (200), (210), (211), and (220) reflections of the cubic BaTiO 3 phase, respectively, according to the literature (JCPDS card no. 31-0174) (Patel et al 2012;Joung et al 2011;Hoshina et al 2008). The cell parameter which was calculated using the Cell Unit program was estimated to be a = 0.40133(6) nm, very close to the literature data (a = 0.4031 nm, JCPDS card no.…”

Section: Resultsmentioning

confidence: 99%

“…Under low NaOH concentrations, the solubility of BaTiO 3 increases and the as-obtained Ba 2? ions can react with CO 2 dissolved in the solution to form BaCO 3 phase (Joung et al 2011). As the broadened XRD patterns in the 2h range of 44-46°( right in Fig.…”

Section: Effects Of Naoh Concentrationsmentioning

confidence: 94%

“…8g) at 44.9 and 45.3°, belonging to (200) and (002) reflections of tetragonal BaTiO 3 phase (JCPDS card no. 05-0626), respectively (Masuda et al 2008;Patel et al 2012;Joung et al 2011;Xie et al 2010). According to the XRD results, we can conclude that prolonging hydrothermal duration can promote the formation of tetragonal BaTiO 3 phase.…”

Section: Growth Mechanism Of Batio 3 Nanocrystals Under Static Hydrotmentioning

confidence: 98%

“…To achieve miniaturization of electronic devices, novel capacitors with smaller volumes are the requisites. In order to shrink large-capacitance MLCCs, the engineers have to decrease the thickness of the MLCCs dielectric layers (Masuda et al 2003), and therefore the BaTiO 3 -based materials with smaller particle sizes and well-defined spherical morphology are needed (Stawski et al 2012;Joung et al 2011;Paniagua et al 2014). When the thickness of the dielectric layers decreases to 0.5 lm, the sizes of the BaTiO 3 powders used should be controlled to be less than 100 nm, and tetragonal BaTiO 3 nanocrystals are needed (Shiratori et al 2007;Xia et al 1996).…”

Section: Introductionmentioning

confidence: 99%

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Factors influencing formation of highly dispersed BaTiO3 nanospheres with uniform sizes in static hydrothermal synthesis

et al. 2015

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Highly dispersed BaTiO 3 nanospheres with uniform sizes have important applications in micro/nanoscale functional devices. To achieve welldispersed spherical BaTiO 3 nanocrystals, we carried out as reported in this paper the systematic investigation on the factors that influence the formation of BaTiO 3 nanospheres by the static hydrothermal process, including the NaOH concentrations [NaOH], molar Ba/Ti ratios (R Ba/Ti ), hydrothermal temperatures, and durations, with an emphasis on understanding the related mechanisms. Barium nitrate and TiO 2 sols derived from tetrabutyl titanate were used as the starting materials. The as-synthesized BaTiO 3 samples were characterized by X-ray diffraction, scanning electron microscopy, energy-dispersive X-ray analysis, thermogravimetry, differential thermal analysis, and FT-IR spectra. The highly dispersed BaTiO 3 nanospheres (76 ± 13 nm) were achieved under the optimum hydrothermal conditions at 200°C for 10 h:[NaOH] = 2.0 mol L -1 and R Ba/Ti = 1.5. Higher NaOH concentrations, higher Ba/Ti ratios, higher hydrothermal temperatures, and longer hydrothermal durations are favorable in forming BaTiO 3 nanospheres with larger fractions of tetragonal phase and higher yields; but too long hydrothermal durations resulted in abnormal growth and reduced the uniformity in particle sizes. The possible formation mechanisms for BaTiO 3 nanocrystals under the static hydrothermal conditions were investigated.

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Section: Effects Of Molar Ba/ti Ratiossupporting

confidence: 90%

Section: Resultsmentioning

confidence: 99%

Section: Effects Of Naoh Concentrationsmentioning

confidence: 94%

Section: Growth Mechanism Of Batio 3 Nanocrystals Under Static Hydrotmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

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Factors influencing formation of highly dispersed BaTiO3 nanospheres with uniform sizes in static hydrothermal synthesis

et al. 2015

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Optimization of magnetic properties of BaTiO3/Li0.5Fe2.5O4 multiferroics prepared via modified low-temperature combustion

Imam

AbouHasswa

Ali

et al. 2022

J Mater Sci: Mater Electron

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Multiferroic (x)BaTiO3/(1 − x)Li0.5Fe2.5O4 (0.0 ≤ x ≤ 1) perovskite/spinel nanocomposite was synthesized using a modified citrate auto-combustion method. Both BaTiO3 (BTO) and Li0.5Fe2.5O4 (LFO) phases along with their composites were successfully characterized using X-ray diffraction, Fourier transformation infrared spectroscopy, and X-ray absorption fine structure spectroscopy. The nanoscale, morphology, and magnetic properties were imaged and acquired using high resolution transmission electron microscopy, atomic force microscopy, and vibrating sample magnetometer. Synchrotron radiation-based elemental selective XAFS technique was performed around Fe K-edge to obtain the selective and the detailed local structural information of Li0.5Fe2.5O4 nanoparticles (NPs). The main remarkable result in this work is the enhancement in the coercivity (HC) of LFO NPs after compositing with BTO particularly at x = 0.6, and at x = 0.8. Based on the collected results, BTO/LFO nanocomposite can be seen as a good candidate for different technological applications including magnetically modulated piezoelectric, safety rechargeable batteries, and multilayer ceramic capacitor.

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Microstructural variation and dielectric properties of KTiNbO5 and K3Ti5NbO14 ceramics

Kweon

Kim

et al. 2014

Ceramics International

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Synthesis of highly tetragonal BaTiO3 nanopowders by a two-step alkoxide–hydroxide route

Cited by 15 publications

References 16 publications

Factors influencing formation of highly dispersed BaTiO3 nanospheres with uniform sizes in static hydrothermal synthesis

Factors influencing formation of highly dispersed BaTiO3 nanospheres with uniform sizes in static hydrothermal synthesis

Optimization of magnetic properties of BaTiO3/Li0.5Fe2.5O4 multiferroics prepared via modified low-temperature combustion

Microstructural variation and dielectric properties of KTiNbO5 and K3Ti5NbO14 ceramics

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