One-Dimensional Piezoelectric BaTiO₃ Polycrystal of Topochemical Mesocrystal Conversion from Layered H₂Ti₄O₉·H₂O Single Crystal

Abstract

A one-dimensional (1D) piezoelectric BaTiO3(BT) polycrystal with a tetragonal system was controllably prepared using a one-step hydrothermal soft chemical process. A layered H2Ti4O9­·H2O (HTO) single crystal was used as the precursor. Interestingly, the obtained polycrystalline BT constructed from oriented BT nanoparticles shows a set of single-crystalline diffraction points, implying that the BT polycrystal is a mesocrystal. The [010] and [001] directions of the obtained mesocrystalline BT correspond to the [001] and [010] directions of the original HTO crystal, respectively, and the [010] direction of the mesocrystalline BT corresponds to the direction along the length of a 1D rod matrix. An in situ topochemical mesocrystal conversion of mesocrystalline BT grown on the HTO substrate occurred not only on the substrate surface but also in the interlayers owing to the unique TiO6 octahedral layers of HTO. In addition, the piezoelectric response of the 1D mesocrystal was captured for the first time. The piezoelectric property of BT mesocrystals hinges on its nanostructure. It is a challenge to develop a special process to prepare highly 1D anisotropic perovskite titanate polycrystals with high crystallinity and piezoelectric response. This novel strategy can be utilized to develop piezoelectric mesocrystalline materials.

Monolithic SrTiO₃/titanate nanotube/TiO₂ nanocomposite toward enhanced photocatalytic activity

“…Similar peak shift attributed to perovskite (BaTiO 3 ) toward lower angle was reported in H 2 Ti 4 O 9 •H 2 O/BaTiO 3 system. 43) The conversion from protonated titanate into SrTiO 3 is considered to take place via a two-step solvothermal topochemical process as reported so far. 50), 51) In the first step, Sr 2+ are intercalated into the interlayer space of protonated titanate by the cation-exchange process from H + into Sr 2+ .…”

Topochemical synthesis of Mn2O3/TiO2 and MnTiO3/TiO2 nanocomposites as lithium-ion battery anodes with fast Li+ migration and giant pseudocapacitance via the mesocrystalline effect

“…In our previous studies, mesocrystalline titanium oxides and titanates, such as TiO 2 , BaTiO 3 , BaTiO 3 /SrTiO 3 nanocomposites, and BaTiO 3 /(Bi 0.5 Na 0.5 )TiO 3 nanocomposites were synthesized from layered titanate precursors by topochemical structure transformation reaction. 24–27 Furthermore, we have synthesized mesocrystalline MTiO 3 /TiO 2 (M = Co, Ni) nanocomposites from M 2+ ion-exchanged layered titanates and demonstrated that the mesocrystalline MTiO 3 /TiO 2 nanocomposites can provide a short distance for charge transport and efficient Li + immigrating passage for Li + insertion/extraction reactions, which results in an enhanced specific charge–discharge capacity. 28,29 However, to the best of our knowledge, the study on the Li + insertion/extraction reaction of mesocrystalline Mn 2 O 3 in LIBs has not been reported.…”

Stabilization of Size-Controlled BaTiO3 Nanocubes via Precise Solvothermal Crystal Growth and Their Anomalous Surface Compositional Reconstruction

“…Barium titanate (BaTiO 3 ) is widely used in ceramic capacitors because of its ferroelectric and piezoelectric properties. , In addition, it exhibits high relative permittivity, enabling its use in sensors, actuators, power transmission devices, memory devices, and high energy storage devices. , However, further improvements to BaTiO 3 particles are necessary in order to enhance their dielectric constant. BaTiO 3 is generally synthesized at temperatures greater than 1000 °C via a solid-phase reaction although such a reaction makes controlling the morphology of the obtained powders difficult.…”