Production of Nanometric Bi4Ti3O 12 Powders: from Synthesis to Optical and Dielectric Properties

Abstract

This paper aims to evaluate the synthesis and annealing parameters for production of nanometric Bi 4 Ti 3 O 12 and its properties. The powders were obtained through the solution combustion route and the impacts of annealing temperature on the materials' physicochemical features as well as their optical and electrical properties were investigated. Thus, the prepared powders were annealed at 600ºC, 700ºC and 800ºC and then characterized by several techniques. The results demonstrated that the combustion method was effective for production of nanocrystalline powders with high levels of purity. A trend for particle and crystallite growth was observed as the calcination temperature increased. X-Ray, HRTEM and Raman spectroscopy confirmed the crystalline nature of the powders, whereas impedance spectroscopy demonstrated a reduction of electrical resistance according to the calcination temperature applied. Optical properties were not highly influenced by annealing. The temperature of 600ºC was appropriate to produce crystalline particles with desirable low sizes for application.

Structural, optical, and magnetic properties of KBiFe2O5 synthesized by a sol‐gel method using PVP as additive

“…Diffuse reflectance measurements (R∞) can be converted into a magnitude proportional to the absorption by applying the Kubelka‐Munk function represented by F(R ∞ ) = [1 − (R ∞ )] 2 /(2R ∞ ) 24‐26 . From this function, it is possible to obtain the band gap of the material using a Tauc plot that consists of plotting the square (direct band gap) or the square root (indirect band gap) of the function [F(R∞)(ℎ v )] 2 vs the excitation energy of the emitted photon (ℎ v ), where ℎ is the Planck's constant and v is the frequency.…”

Yb/Ho Codoped Layered Perovskite Bismuth Titanate Microcrystals with Upconversion Luminescence: Fabrication, Characterization, and Application in Optical Fiber Ratiometric Thermometry

“…The Bi 4 Ti 3 O 12 host was further investigated by Raman spectroscopy under 532 nm excitation, and the results are shown in Figure b. The modes at 228, 304, 360, and 396 cm –1 can be attributed to the bending vibration of O–Ti–O bonds, while the modes at 458 and 658 cm –1 can be assigned to the symmetric stretching of Ti–O bonds. , The modes at 571 and 606 cm –1 can be ascribed to the opposing excursions of the external apical oxygen atoms of [TiO 6 ] and the O–Ti–O into (Bi 2 Ti 3 O 10 ) 2– blocks, respectively . In addition, the modes around 851 cm –1 are due to [TiO 6 ] octahedron.…”

Growth Process and CQDs-modified Bi4Ti3O12 Square Plates with Enhanced Photocatalytic Performance

“…The strong peak at 477 cm −1 and weak peak at 586 cm −1 are characterized as the Ti–O stretching vibration. The characteristic stretching vibration of Bi–O is observed at 819 cm −1 [63,64]. This implies the formation of the Bi 4 Ti 3 O 12 orthorhombic phase and its crystal structure undergoes no destruction when decorated with CQDs.…”