Perovskite phase formation in the PbMg1/3Nb2/3 O3-PbZrO3-PbTiO3 system by the columbite route
- 66 Downloads
The reaction mechanism of PbMg1/3Nb2/3O3-PbZrO3-PbTiO3 (PMN-PZT) perovskite phase prepared by the columbite route has been studied in the temperature range from 600 to 800 °C. The effects of heating and cooling rate during the calcination of 3PbO +MgNb2O6+PZT powder mixtures have also been investigated. Nearly pure perovskite phase, 0.9 PMN-0.1 PZTsolid solution with no pyrochlore phase, as determined by X-ray diffraction, could be prepared at 800 °C for 2 H. From DTA/TGA, dilatometry and XRD data the reaction mechanism of PMN-PZT solid solution formation could be divided into three steps: (i) decomposition of columbite (MgNb2O6) by reacting with PbO at 350 to 600 °C (ii) the formation of a B-site-deficient pyrochlore phase Pb2Nb1.33Mg0.17O5.50 at close to 650 °C, and (iii) the formation of perovskite phase PMN-PZT solid solution from the reaction of Pb2Nb1.33Mg0.17O5.50 pyrochlore phase with MgO and PZT above 650 °C.
KeywordsPolymer Cool Rate Calcination Perovskite Reaction Mechanism
Unable to display preview. Download preview PDF.
- 1.M. Inada, Natl. Tech. Rep. (Matsushita Elect. Ind. Co.) 27 (1) (1977) 95.Google Scholar
- 7.J. P. Guha and H. U. Anderson, J. Amer. Ceram. Soc. 69 (1986) C-287.Google Scholar
- 9.J. Chen, A. Gorton, H. M. Chan and P. Harmer, ibid. 69 (1986) C-303.Google Scholar
- 10.J. P. Guha and H. U. Anderson, Unpublished work.Google Scholar