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Heterometallic lead-titanium oxyalkoxide precursors to lead titanate thin films

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Abstract

Two lead titanium oxyalkoxides with composition Pb2Ti4O2(O2CCH3)2(OC2H5)14 and Pb2Ti2O2(O2CCH3)2(OCH(CH3)2)8 have been isolated and characterised by elemental analysis, IR, 207Pb NMR and molecular weight measurements. X-ray structural analysis of the 1:2 complex confirmed the presence of two Pb2Ti2O units which are linked by a common Pb···Pb edge and are held together by alkoxide and acetate bridges. The acetate groups have migrated from the Pb to the Ti centres during the reaction. Hydrolysis of the 1:1 Pb/Ti complex produced clear gels providing the H2O/complex ratio was less than 4. Heat treatment of the gel results in loss of residual organics below 400°C. The XRD pattern indicates the presence of the pyrochlore and perovskite phases after heating at 500°C but the sample is poorly crystalline. Complete conversion to the perovskite phase of lead titanate occurs on heating to 600°C for 1 hour. Thin films of lead titanate were deposited by dip-coating a solution of this complex in isopropanol. Analyses of the films, carried out using electron microprobe, Scanning Auger Spectroscopy and Rutherford Backscattering, indicated that they were of excellent quality, crystalline after heating at 600°C and with relatively sharp substrate-coating interface.

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Authors and Affiliations

  1. Centre for Chemical Synthesis and Department of Chemistry, Monash University, 3168, Clayton, Vic., Australia

    J. Bates, Q. Zhang, L. Spiccia & B. O. West

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  1. J. Bates
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  2. Q. Zhang
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  3. L. Spiccia
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  4. B. O. West
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Bates, J., Zhang, Q., Spiccia, L. et al. Heterometallic lead-titanium oxyalkoxide precursors to lead titanate thin films. J Sol-Gel Sci Technol 2, 29–34 (1994). https://doi.org/10.1007/BF00486209

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