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  • Nanocrystalline BaTiO was synthesized through hydrothermal methods using titanium isopropoxide and barium hydroxide, focusing on optimizing conditions for small crystallites and fewer defects.
  • Higher synthesis temperatures and specific Ba/Ti precursor ratios influence the size and tetragonality of the BaTiO crystallites, with the best results achieved at 120 °C and a 2:1 ratio.
  • The optimal conditions produced BaTiO crystals with a minimum particle size of 107 nm and reduced defect concentrations at higher temperatures.

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In this study, the synthesis and structural evolution of pure BaTiO and BaTiO co-doped with La and Bi, produced using the ball milling method and heat treatment, were analyzed. The starting materials included chemically pure precursor powders of BaCO, TiO, LaO and BiO. Stoichiometric calculations were performed using the BaLaTiBiO mechanism with concentrations x = 0.

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Hydrogen production from water by piezocatalysis is very attractive owing to its high energy efficiency and novelty. BaTiO, a highly piezoelectric material, is particularly suitable for this application due to its high piezoelectric potential, non-toxic nature, and physicochemical stability. Owing to the critical role of morphology on properties, one-dimensional (1D) materials are expected to exhibit superior water-splitting performance and thus there is a need to optimise the processing conditions to develop outstanding piezocatalysts.

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Article Synopsis
  • Nanocrystalline BaTiO was synthesized through hydrothermal methods using titanium isopropoxide and barium hydroxide, focusing on optimizing conditions for small crystallites and fewer defects.
  • Higher synthesis temperatures and specific Ba/Ti precursor ratios influence the size and tetragonality of the BaTiO crystallites, with the best results achieved at 120 °C and a 2:1 ratio.
  • The optimal conditions produced BaTiO crystals with a minimum particle size of 107 nm and reduced defect concentrations at higher temperatures.
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Magnetic and dielectric property control in the multivalent nanoscale perovskite EuBaTiO.

Nanoscale

June 2021

The CUNY Energy Institute, City University of New York, Steinman Hall, 160 Convent Avenue, The City College of New York, New York, NY 10031, USA.

We report nanoscale EuBaTiO, a multiferroic in the bulk and candidate in the search to quantify the electric dipole moment of the electron. EuBaTiO, in the form of nanoparticles and other nanostructures is interesting for nanocomposite integration, biomedical imaging and fundamental research, based upon the prospect of polarizability, f-orbital magnetism and tunable optical/radio luminescence. We developed a [non-hydrolytic]sol-[HO-activated]gel route, derived from in-house metallic Ba/Eu alkoxide precursors and Ti{(OCH(CH)}.

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Silicon-based moieties were anchored in heterometallic alkoxide platforms to obtain molecular clusters based on the M-O-M'-O-Si motif for the generation of mixed-metal silicate materials. Single-source molecular precursors with structures [M{(μ-ddbfo)2Al(OSiPh3)2}2], where dbbfoH = 2,3-dihydro-2,2-dimethylbenzofuran-7-ol and M = Ba (1), Sr (2), [Sr4Ti2(μ6-O)(μ3,η2-OCH2CH2OMe)8(η-OCH2CH2OMe)2(OSiPh3)4] (3), [Sr4M'2(μ4-OH)(μ3,η2-OCH2CH2OMe)4(μ,η2-OCH2CH2OMe)6(μ-X)(OSiPh3)4] (4, with M' = Zr and X = Cl; 5 with M' = Hf and X = OH), [Sr3Hf2(μ5-O)(μ3,η2-OCH2CH2OMe)4(OCH2CH2OMe)4(OSiPh3)4] (6), and [Ca2M'2(μ3-OH)2(μ,η2-OCH2CH2OMe)4(η2-HOCH2CH2OMe)2(η-OCH2CH2OMe)2(OSiPh3)4] for M' = Zr (7), Hf (8), were prepared by substitution of methyl groups, using Ph3SiOH or chloride atoms with KOSiPh3, in [M{(μ-ddbfo)2AlMe2}2] (M = Sr, Ba) or [M4M'2(μ6-O)(μ3,η2-OCH2CH2OMe)8(OCH2CH2OMe)2(HOCH2CH2OMe)xCl4] (M = Ca, Sr, Ba, M' = Ti, Zr, Hf and x = 0, 4). The precursors were characterized by elemental analysis, NMR spectroscopy, and single-crystal X-ray structural analysis.

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