ISSN 0862-5468 (Print), ISSN 1804-5847 (online)

 Information
Home
Publisher
Publication policy
Editorial board
Editors
Impact factor

Online submission
Author guidelines
Instruction for reviewers
Download instructions
 List of Content
Volume 59, 2015
  - Issue 1
  -
Issue 2
  - Issue 3
  - Issue 4
Volume 58, 2014
  - Issue 1
  -
Issue 2
  - Issue 3
  - Issue 4
Volume 57, 2013
  - Issue 1
  -
Issue 2
  - Issue 3
  - Issue 4
Previous Issues
  - 1995 - 2012

Ceramics-Silikáty 49 (3) 188-194 (2005)


SEMI-CONDUCTING BARIUM TITANATE CONTAINING B2O3

H. Erkalfa, R. Cesmeci, B. YUksel, T. O. Ozkan

The effects of the grain boundary modifiers H3BO3 and SiO2 before and after the calcination steps on the microstructure and on the positive temperature coefficient of resistivity (PTCR) of Sb2O3 donor-doped Ti-excess barium titanate (BT) were investigated. The additions before calcination resulted in coarse porosity between the grains and the additions after calcination gave rounded, uniform grains with a pronounced decrease in porosity. The Sb2O3 donor-doped BT became conductive when sintered at 1300°C giving a room temperature resistivity (rRT) of 400 Ohm cm. The rRT values of the B2O3 and SiO2 contained samples decreased when modifiers were added after the calcination step. The Sb2O3 donor-doped BT showed a PTCR effect of 4.2 orders of magnitude and a range of 4.5-5.0 orders of magnitude were obtained for the B2O3 and SiO2 added samples.

Keywords: Semiconduction, Barium titanate, Boron sintering aid

 Download the full version (PDF, 567K)

[Back]

 Webmaster l Journal Contact l Server Statistics l Last updated 11/15/15 l