Structural and Electrical Properties of Sol-Gel-processed CdTiO3 Powders and Films

Angelo Montenero, Marco Canali, Guglielmina Gnappi, Danilo Bersani, Pier Paolo Lottici, Patrizia Nunziante, Enrico Traversa*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

29 Scopus citations

Abstract

Cadmium titanate, CdTiO3, was prepared by the sol-gel technique in bulk and in thin film form. The thermal evolution of the gels and the phase changes were studied by thermogravimetric analysis (TGA), X-ray diffractometry (XRD) and Raman and energy-dispersive (EDS) speetroscopies. The morphology of the samples was observed using scanning electron microscopy (SEM). Gels heated to 800°C gave rise to powders with only the ilmenite-like phase. The orthorhombic perovskite phase is the only crystalline phase observed after a 4 h heat-treatment at 1100°C. With respect to the conventional preparation method by solid-state reaction, by the sol-gel method it is possible to prepare the ilmenite phase at lower temperatures and the perovskite phase in a shorter time. Clear, homogeneous thin films were obtained by the dip-coating method. The refraction index and the thickness of the films were measured using ellipsometry. The humidity-sensitive electrical properties were measured for thin films deposited on alumina substrates with comb-type gold electrodes, heated to 200°C and 450°C. The films heated to 200°C, which still contained organics, showed a variation of the resistance of six orders of magnitude in the relative humidity (RH) range tested (4-87% RH). The films heated to 450°C, made of ilmenite-type CdTiO3, were nearly insensitive to RH.

Original languageEnglish (US)
Pages (from-to)137-146
Number of pages10
JournalApplied Organometallic Chemistry
Volume11
Issue number2
DOIs
StatePublished - Feb 1997

Keywords

  • CdTiO
  • Electrical properties
  • Humidity sensors
  • Powders
  • Raman spectroscopy
  • Scanning electron microscopy (SEM)
  • Sol-gel
  • Structural properties
  • Thin films
  • X-ray diffraction (XRD)

ASJC Scopus subject areas

  • Chemistry(all)
  • Inorganic Chemistry

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