Low-temperature synthesis of solid-solution BaxSr1-xTiO3 nanocrystals

被引:45
作者
Beier, Christopher W. [1 ]
Cuevas, Marie A. [1 ]
Brutchey, Richard L. [1 ]
机构
[1] Univ So Calif, Dept Chem, Los Angeles, CA 90089 USA
基金
美国国家科学基金会;
关键词
FERROELECTRIC PHASE-TRANSITION; BARIUM-TITANATE; DIELECTRIC-PROPERTIES; STRONTIUM-TITANATE; CRYSTALLINE BATIO3; NANOPARTICLES; CERAMICS; SRTIO3; STRATEGY; NANORODS;
D O I
10.1039/c0jm00845a
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The very low-temperature synthesis (20-80 degrees C) of sub-15 nm BaxSr1-xTiO3 (0 <= x <= 1) nanocrystals and characterization of their dielectric properties as a function of composition are reported. A series of BaxSr1-xTiO3 nanocrystals were synthesized under ultrabenign conditions (i.e., low temperatures, ambient pressure and neutral pH) using a vapor diffusion sol-gel technique, whereby water is slowly diffused into a mixture of bimetallic alkoxides to yield the solid-solution nanocrystals in quantitative yield on the gram scale. The unsintered 12 nm Ba0.69Sr0.31TiO3 nanocrystals synthesized at 20 degrees C possess a maximized dielectric constant (epsilon' = 341 at 1 kHz) for the solid solution series, and is more than an order of magnitude greater than the dielectric constant for SrTiO3 (epsilon' = 11.0 at 1 kHz). The observed non-monotonic dependence of the dielectric constant on solid solution composition for these small nanocrystals is consistent with theoretical and empirical studies for bulk BaxSr1-xTiO3 ceramics, proving this dielectric effect holds for small nanocrystals.
引用
收藏
页码:5074 / 5079
页数:6
相关论文
共 36 条
[1]   Solution-Based Growth of Monodisperse Cube-Like BaTiO3 Colloidal Nanocrystals [J].
Adireddy, Shiva ;
Lin, Cuikun ;
Cao, Baobao ;
Zhou, Weilie ;
Caruntu, Gabriel .
CHEMISTRY OF MATERIALS, 2010, 22 (06) :1946-1948
[2]   Synthesis, characterization and dielectric properties of nanometersized barium strontium titanates prepared by the polymeric citrate precursor method [J].
Arya, PR ;
Jha, P ;
Ganguli, AK .
JOURNAL OF MATERIALS CHEMISTRY, 2003, 13 (02) :415-423
[3]   Effect of Surface Modification on the Dielectric Properties of BaTiO3 Nanocrystals [J].
Beier, Christopher W. ;
Cuevas, Marie A. ;
Brutchey, Richard L. .
LANGMUIR, 2010, 26 (07) :5067-5071
[4]   Room-Temperature Synthetic Pathways to Barium Titanate Nanocrystals [J].
Beier, Christopher W. ;
Cuevas, Marie A. ;
Brutchey, Richard L. .
SMALL, 2008, 4 (12) :2102-2106
[5]   The perovskite structure - a review of its role in ceramic science and technology [J].
Bhalla, AS ;
Guo, RY ;
Roy, R .
MATERIALS RESEARCH INNOVATIONS, 2000, 4 (01) :3-26
[6]   Positive temperature coefficient of resistivity in donor-doped BaTiO3 ceramics derived from nanocrystals synthesized at low temperature [J].
Brutchey, Richard L. ;
Cheng, Guosheng ;
Gu, Qian ;
Morse, Daniel E. .
ADVANCED MATERIALS, 2008, 20 (05) :1029-+
[7]   Template-free, low-temperature synthesis of crystalline barium titanate nanoparticles under bio-inspired conditions [J].
Brutchey, Richard L. ;
Morse, Daniel E. .
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, 2006, 45 (39) :6564-6566
[8]   PROPERTIES OF BARIUM-STRONTIUM TITANATE DIELECTRICS [J].
BUNTING, EN ;
SHELTON, GR ;
CREAMER, AS .
JOURNAL OF THE AMERICAN CERAMIC SOCIETY, 1947, 30 (04) :114-125
[9]   SYNTHESIS, STRUCTURAL PRINCIPLES, AND REACTIVITY OF HETEROMETALLIC ALKOXIDES [J].
CAULTON, KG ;
HUBERTPFALZGRAF, LG .
CHEMICAL REVIEWS, 1990, 90 (06) :969-995
[10]   CHEMICAL ASPECTS OF SOLUTION ROUTES TO PEROVSKITE-PHASE MIXED-METAL OXIDES FROM METAL-ORGANIC PRECURSORS [J].
CHANDLER, CD ;
ROGER, C ;
HAMPDENSMITH, MJ .
CHEMICAL REVIEWS, 1993, 93 (03) :1205-1241