Back to Search
Start Over
Origin of low dielectric loss and giant dielectric response in (Nb+Al) co‐doped strontium titanate.
- Source :
- Journal of the American Ceramic Society; Nov2018, Vol. 101 Issue 11, p5089-5097, 9p, 1 Diagram, 8 Graphs
- Publication Year :
- 2018
-
Abstract
- Abstract: (Nb+Al) co‐doped SrTiO<subscript>3</subscript> ceramics with a nominal composition of Sr(Nb<subscript>0.5</subscript>Al<subscript>0.5</subscript>)<subscript>x</subscript>Ti<subscript>1‐</subscript><subscript>x</subscript>O<subscript>3</subscript> (x = 0, 0.02, 0.04, and 0.06) were fabricated using the conventional solid‐state reaction method; giant permittivity (10500) and low dielectric loss (0.03) were obtained at x = 0.06. Dielectric and impedance spectroscopy, X‐ray photoelectron spectroscopy, and Raman spectroscopy, were employed to study why the dielectric property improved. The results indicate that the giant dielectric response occurs because of the combined effects of the off‐center Ti<superscript>3+</superscript> reorientation and conduction of electrons with the polar ordering structure Ti<superscript>3+</superscript>/Ti<superscript>4+</superscript>. In contrast, the low dielectric loss can be attributed to electron localization that occurs because of the defect dipole Ti 4 + · e − V o · · − Ti 4 + · e. These fundamental understandings will benefit the design of doped SrTiO<subscript>3</subscript> ceramics with desired performance. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00027820
- Volume :
- 101
- Issue :
- 11
- Database :
- Complementary Index
- Journal :
- Journal of the American Ceramic Society
- Publication Type :
- Academic Journal
- Accession number :
- 131662461
- Full Text :
- https://doi.org/10.1111/jace.15762