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Synthesis and characterization of bismuth zinc niobate pyrochlore nanopowders
| Content Provider | Scilit |
|---|---|
| Author | Zanetti, Sonia Maria Silva, Sandra Andréia da |
| Copyright Year | 2007 |
| Description | Bismuth zinc niobate pyrochlores Bi1.5ZnNb1.5O7 (alpha-BZN), and Bi2(Zn1/3Nb2/3)2O 7 (beta-BZN) have been synthesized by chemical method based on the polymeric precursors. The pyrochlore phase was investigated by differential scanning calorimetry, infrared spectroscopy, and X ray diffraction. Powder and sintered pellets morphology was examined by scanning electron microscopy. The study of alpha-BZN phase formation reveals that, at 500 °C, the pyrochlore phase was already present while a single-phased nanopowder was obtained after calcination at 700 °C. The crystallization mechanism of the beta-BZN is quite different, occurring through the crystallization of alpha-BZN and BiNbO4 intermediary phases. Both compositions yielded soft agglomerated powders. alpha-BZN pellets, sintered at 800 °C for 2 hours, presented a relative density of 97.3% while those of beta-BZN, sintered at 900 °C for 2 hours, reached only 91.8%. Dielectric constant and dielectric loss, measured at 1 MHz, were 150 and 4 x/10-4 for a-BZN, and 97 and 8 x 10-4 for beta-BZN |
| Related Links | http://www.scielo.br/scielo.php?script=sci_pdf&pid=S1516-14392007000300008&lng=en&nrm=iso&tlng=en |
| Ending Page | 266 |
| Page Count | 6 |
| Starting Page | 261 |
| ISSN | 15161439 |
| e-ISSN | 19805373 |
| DOI | 10.1590/s1516-14392007000300008 |
| Journal | Materials Research |
| Issue Number | 3 |
| Volume Number | 10 |
| Language | English |
| Publisher | FapUNIFESP (SciELO) |
| Publisher Date | 2007-09-01 |
| Access Restriction | Open |
| Subject Keyword | Materials Research Zinc Niobate Niobate Pyrochlore Pyrochlore Nanopowders Bismuth Zinc |
| Content Type | Text |
| Resource Type | Article |
| Subject | Mechanics of Materials Condensed Matter Physics Materials Science Mechanical Engineering |
