Sol-gel synthesis and characterization of PZT-PFN thin films

STACHIOTTI, MARCELO; IMHOFF, LUCIA; BAROLIN, SEBASTIAN; PELLEGRI, NORA

Foz do Iguazu

Congreso; 7th International Congress on Ceramics ? ICC7; 2018

(1-x)PZT-xPFN thin films were prepared by a chelate route based on the use of acetoin (3-Hydroxy 2-butanone) as chelating agent. This material has perovskite structure and consists of a solid solution betweenPbZr0,52Ti0,48O3 and PbFe0,5Nb0,5O3, considering that adding magnetic Fe3+ ions to the PZT-structure was proved to be a good strategy to develop room-temperature multiferroic ceramics [1,2]. In previous works an optimized chelate route for the fabrication of pyrochlore-free PZT was developed [3], and a similar approach was used to obtain the PFN precursor solution. Both precursors were mixed to obtain the differentcompositions and then deposited onto platinized silicon substrates Pt/Ti/SiO2/Si by spin coating and dried at 200 oC on a hot plate. Two different thermal treatments were applied: Conventional Furnace Annealing(CFA) and Rapid Thermal Annealing (RTA) at 650oC. Structural and morphologic characterizations were made by DRX and AFM finding coexistence between perovskite and pyrochlore, a secondary non-ferroelectric phase. It was also found that rapid thermal annealing favors the perovskite formation. Dielectric properties were measured and ferroelectric cycles were obtained at different frequencies. Finally, a weak magnetic response was found in the films, especially at those samples with high concentration of Fe3+. References: [1] A. Kumar, R.S. Katiyar, J.F. Scott, J. Appl. Phys., 108 (2010), 064105. [2] A. Kumar, I. Rivera, R.S. Katiyar, J.F. Scott, Appl. Phys. Lett., 92 (2008), 132913. [3] L. Imhoff, S. Barolin, N. Pellegri, M. Stachiotti, J. Sol-Gel Sci. Technol. (2017) 83:375-381.