Nanoporous BaTiO3 Crystallites

authors	Hou, RZ; Ferreira, P; Vilarinho, PM
nationality	International
journal	CHEMISTRY OF MATERIALS
keywords	SOFT-MODE SPECTROSCOPY; X-RAY-DIFFRACTION; BARIUM-TITANATE; THIN-FILMS; PARTICLES; FERROELECTRICITY; CONSTANTS; CERAMICS; OXIDES; MERIT
abstract	Morphology modification of ferroelectric materials at the nanoscale is an important aspect for further development of ferroelectrics. In this work, the synthesis of nanoporous barium titanate prepared under the assistance of Pluronic PE 10300 block copolymer is reported. Nanopores reside inside the BaTiO3 crystallites that exhibit a specific BET surface area around 70 m(2)/g and nanopore volume fraction of 44.7%. X-ray diffraction of nanoporous BaTiO3 indicates an average cubic structure while Raman spectra suggest local structural distortions of the lattice. With Landauer-Bruggeman effective medium approximation (LB-EMA), the dielectric constant (at 1 MHz) of nanoporous BaTiO3 and solid BaTiO3 (excluding all porosity) was estimated as 112 and 706, respectively, implying,in effective way to manipulate the dielectric constant of materials by introducing nanopores.
publisher	AMER CHEMICAL SOC
issn	0897-4756
year published	2009
volume	21
issue	15
beginning page	3536
ending page	3541
digital object identifier (doi)	10.1021/cm803318n
web of science category	Chemistry, Physical; Materials Science, Multidisciplinary
subject category	Chemistry; Materials Science
unique article identifier	WOS:000268523300011