A surfactant-free route to synthesize Ba x Sr1−x TiO3 nanoparticles at room temperature, their dielectric and microwave absorption properties

Abstract

Perovskite materials, such as BaxSr1−xTiO3 (BST), have been continuously receiving attentions due to their unique ferroelectric, pyroelectric, dielectric, piezoelectric and electric-optic properties. Here, we report a facile route for the synthesis of BST nanocrystalline materials by fast mixing of MCl2 (M = Ba, Sr) aqueous solution and titanium isopropoxide ethanol solution at room temperature without using any surfactants or structure-directing templates. The molar ratio of Ba/Sr was controlled by adjusting the original molar ratio of BaCl2·2H2O and SrCl2·6H2O. The dielectric properties and microwave absorption capability of the BST nanocrystalline were studied. The results indicate that the BST nanocrystalline material has the best dielectric and microwave absorption properties in the case of Ba0.7Sr0.3TiO3. The present strategy is facile, low cost and high yield, which may provide a new route for the synthesis of other perovskite materials.

Ba4M(CO3)2(BO3)2 (M=Ba, Sr): two borate-carbonates synthesized by open high temperature solution method

“…For the CO 3 triangles, the C-O bond lengths are in the range of 1.298(7)-1.327(9) Å, the O-C-O bond angles are within 2°of the 3-fold symmetrical 120°angle (Table S2). These results are consistent with those observed in other compounds [62][63][64][65]. ] layers, which makes them adopt their own symmetry and ar-rangement without affecting each other.…”

Hydrogenated TiO2/SrTiO3 porous microspheres with tunable band structure for solar-light photocatalytic H2 and O2 evolution

“…The synergistic effects of the two related half-reactions, i.e., photoinduced electron reduction and hole oxidation, are very important for H2 and O2 evolution from water splitting, and inherently determine photocatalysis efficiency [5]. Since the pioneering work by Fujishima and Honda on water splitting to produce H2 and O2 under UV illumination utilizing TiO2 photoelectrodes, many photocatalysts, such as TiO2 and SrTiO3, have been widely investigated for water splitting applications owing to their non-toxicity, low cost, chemical and optical stability, and biocompatibility [6][7][8][9]. However, rapid recombination of photogenerated charge carriers and low visible-light utilization because of their wide band gap have limited their practical application.…”

Pengaruh Penggantian Kation-A/Sr oleh Ba pada Morfologi Partikel BaxSr(1-x)TiO3 (x = 0; 0,2; 0,4; 0,6; 0,8) Hasil Sintesis dengan Metode Lelehan Garam

“…Khare dan Chauhan (2015) juga melaporkan bahwa keberadaan logam Ba dapat meningkatkan ukuran partikel dari SrTiO3, akan tetapi gambar yang diperoleh dari karakterisasi dengan menggunakan scanning electron microscopy (SEM) masih belum jelas menggambarkan morfologi partikelnya. Wu et al (2016) juga melaporkan pengaruh dopan Barium pada senyawa SrTiO3 (BaxSr(1-x)TiO3 (x = 0; 0,1; 0,2; 0,3; 0,4; 0,5; 0,6; 0,7; 0,8; 0,9 dan 1)) yang disintesis dengan pencampuran sederhana prekusor BaCl2•2H2O, SrCl2•6H2O dan Titanium Isopropoksi dalam larutan air/etanol selama 6 jam dan dilaporkan bahwa keberadaan doping Ba mengubah morfologi partikel dari kubus menjadi sphere. Kenaikan konsentrasi dopan Ba juga dilaporkan menyebabkan penurunan ukuran partikelnya.…”