SpringerOpen Newsletter

Receive periodic news and updates relating to SpringerOpen.

Open Access Nano Express

Influences of phase transition and microstructure on dielectric properties of Bi0.5Na0.5Zr1-xTixO3 ceramics

Panupong Jaiban1, Ampika Rachakom1, Sukanda Jiansirisomboon12 and Anucha Watcharapasorn12*

Author Affiliations

1 Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand

2 Materials Science Research Center, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand

For all author emails, please log on.

Nanoscale Research Letters 2012, 7:45  doi:10.1186/1556-276X-7-45

Published: 5 January 2012

Abstract

Bismuth sodium zirconate titanate ceramics with the formula Bi0.5Na0.5Zr1-xTixO3 [BNZT], where x = 0.3, 0.4, 0.5, and 0.6, were prepared by a conventional solid-state sintering method. Phase identification was investigated using an X-ray diffraction technique. All compositions exhibited complete solubility of Ti4+ at the Zr4+ site. Both a decrease of unit cell size and phase transition from an orthorhombic Zr-rich composition to a rhombohedral crystal structure in a Ti-rich composition were observed as a result of Ti4+ substitution. These changes caused dielectric properties of BNZT ceramics to enhance. Microstructural observation carried out employing SEM showed that average grain size decreased when addition of Ti increased. Grain size difference of BNZT above 0.4 mole fraction of Ti4+ displayed a significant increase of dielectric constant at room temperature.

Keywords:
ceramics; X-ray diffraction; electron microscopy; crystal structure; electrical properties