Structural Characteristics & Dielectric Properties of Tantalum Oxide Doped Barium Titanate Based Materials
|
| Title | Structural Characteristics & Dielectric Properties of Tantalum Oxide Doped Barium Titanate Based Materials |
| Authors | |
| Abstract | In this research, the causal relationship between the dielectric properties and the structural characteristics of 0.5 & 1.0 mol% Ta2O5 doped BaTiO3 based ceramic materials were investigated under different sintering conditions. Dielectric properties and microstructure of BaTio3 ceramics were significantly influenced by the addition of a small amount of Ta2O5. Dielectric properties were investigated by measuring the dielectric constant (k) as a function of temperature and frequency. Percent theoretical density (%TD) above 90% was achieved for 0.5 and 1.0 mol% Ta2O5 doped BaTiO3. It was observed that the grain size decreased markedly above a doping concentration of 0·5 mol% Ta2O5. Although fine grain size down to 200-300nm was attained, grain sizes in the range of 1-1.8µm showed the most alluring properties. The fine-grain quality and high density of the Ta2O5 doped BaTiO3 ceramic resulted in tenfold increase of dielectric constant. Stable value of dielectric constant as high as 13000-14000 was found in the temperature range of 55 to 80°C, for 1.0 mol% Ta2O5 doped samples with corresponding shift of Curie point to ~82°C. Experiments divulged that incorporation of a proper content of Ta2O5 in BaTiO3 could control the grain growth, shift the Curie temperature and hence significantly improve the dielectric property of the BaTiO3 ceramics. |
| Publisher | Faculty of Mechanical Engineering University of Zilina, Slovak Republic |
| Date | 2012-11-13 |
| Source | Materials Engineering - Materiálové inžinierstvo (MEMI) Vol 20, No 1 (2013) |
| Rights | Articles published in this Open Acess Journal are licensing using Creative Commons License. Except where otherwise noted, individual articles in the Materials Engineering - Materiálové inžinierstvo journal are licensed under a CREATIVE COMMONS ATTRIBUTION-NON COMMERCIAL-NO DERIVS 3.0 UNPORTED LICENSE (for details please visit http://creativecommons.org/licenses/by-nc-nd/3.0/ ).Copyrights for articles published in Materials Engineering - Materiálové inžinierstvo (MEMI) journal are retained by the authors, with first publication rights granted to the journal. The journal/publisher is not responsible for subsequent uses of the work.Authors are permited to self-archive the final version of their published articles into institutional repositories. Authors can use the final version of published article for the non-exclusive distribution with an acknowledgement of its previous publication in this journal.Authors are allowed to post their work to institutional repositories prior to and during the submission (evaluation) process. |