Structures and Role of the Intermediate Phases on the Crystallization of BaTiO3 from an Aqueous Synthesis Route

被引：8

作者：

Bakken, Kristine ^{[1
]}

Pedersen, Viviann H. ^{[1
]}

Blichfeld, Anders B. ^{[1
]}

Nylund, Inger-Emma ^{[1
]}

Tominaka, Satoshi ^{[2
]}

Ohara, Koji ^{[3
]}

Grande, Tor ^{[1
]}

Einarsrud, Mari-Ann ^{[1
]}

机构：

[1] NTNU Norwegian Univ Sci & Technol, Dept Mat Sci & Engn, N-7491 Trondheim, Norway

[2] Natl Inst Mat Sci, Int Ctr Mat Nanoarchitecton, Tsukuba, Ibaraki 3050044, Japan

[3] Japan Synchrotron Radiat Res Inst, Ctr Synchrotron Radiat Res, Diffract & Scattering Div, Sayo, Hyogo 6795198, Japan

来源：

ACS OMEGA | 2021年 / 6卷 / 14期

关键词：

SOL-GEL SYNTHESIS; IN-SITU; BARIUM-TITANATE; THIN-FILMS; THERMAL-DECOMPOSITION; POLYMERIZED COMPLEX; NANOCRYSTALS; CHEMISTRY; MECHANISM; EVOLUTION;

D O I：

10.1021/acsomega.1c00089

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Carbonate formation is a prevailing challenge in synthesis of BaTiO3, especially through wet chemical synthesis routes. In this work, we report the phase evolution during thermal annealing of an aqueous BaTiO3 precursor solution, with a particular focus on the structures and role of intermediate phases forming prior to BaTiO3 nucleation. In situ infrared spectroscopy, in situ X-ray total scattering, and transmission electron microscopy were used to reveal the decomposition, pyrolysis, and crystallization reactions occurring during thermal processing. Our results show that the intermediate phases consist of nanosized calcite-like BaCO3 and BaTi4O9 phases and that the intimate mixing of these along with their metastability ensures complete decomposition to form BaTiO3 above 600 degrees C. We demonstrate that the stability of the intermediate phases is dependent on the processing atmosphere, where especially enhanced CO2 levels is detrimental for the formation of phase pure BaTiO3.

引用

页码：9567 / 9576

页数：10

共 45 条

[1] BaTiO3-based piezoelectrics: Fundamentals, current status, and perspectives [J].