Fabrication of Monodispersed 5‐nm BaTiO₃ Nanocrystals with Narrow Size Distribution via One‐Step Solvothermal Route

Abstract

A convenient one-step solvothermal route has been developed to synthesize monodispersed barium titanate with narrow size distributions. The key point of this method is the controlling of hydrolysis of Ti(OC 4 H 9 ) 4 with Diethylene glycol. The asprepared BaTiO 3 nanoparticles were characterized by X-ray diffraction, transmission electron microscopy (TEM), highresolution TEM, BET-specific surface area measurement and Raman spectrum. The monodispersed BaTiO 3 nanoparticles obtained by this method have an average size of 5 nm with a narrow size distribution and a lattice tetragonality of 1.0069 ± 0.0010, which is promising for the ferroelectric science and its industry application.

Significant increase of Curie temperature in nano-scale BaTiO3

“…The grain size was further reduced to 5 nm in 2011. 15 Raman spectra and dielectric investigations showed the coexistence of various phases, suggesting that ferroelectricity remains in BaTiO 3 ceramics with grain size as small as only a few nanometers. 27 The reported works show that size has significant influences on phase structure, phase transition temperature including T c , and thus on dielectric and ferroelectric properties for BaTiO 3 .…”

“…Thanks to the development of nanotechnology, particles with size down to 5 nm were prepared. 15 Multi-phase coexistence was then found in BaTiO 3 nanoparticles in the range from 5 nm to 100 nm by using high resolution synchrotron x-ray diffraction. 16 The same phenomenon was further confirmed by Han in 2013 (Ref.…”

“…15 The nanoparticles were then dispersed on the DENSsolutions' consumable EMheaterchipTM 34 for subsequent in-situ TEM observation. In our experiment, the EMheaterchipTM was heated up to 600 C inside the DENSsolutions single tilt holder by the sample heating system.…”

Innovative architectures in ferroelectric multi-materials: Chemistry, interfaces and strain

“…[4][5][6][7] Ferroelectric nanopowders with a grain size below 20 nm are now available but the processing routes used are mainly focused on barium titanate (BT). [8][9][10] Producing well-crystallized sub-50 nm grains of narrow size distribution and over a whole solid solution is still a challenge. In addition, several works in literature, underline the spreading of the permittivity values and highlight the strong influence of both synthesis and sintering methods.…”

Investigation on the synthesis procedure of ultrafine monodispersed BaTiO₃ powders by solvothermal method

“…1. Combined with the XRD patterns, shown in the supporting information, 13) all samples are well crystallized in perovskite structure and no other miscellaneous peaks exist. As concentration decreasing, the particle size of BaTiO 3 decreases correspondingly and becomes more uniform, which can be confirmed by the TEM images as well as the broadening of the XRD peaks.…”