Structure and optical properties of nanocrystalline yttria doped ceria thin films

Journal Article · Sat Jun 20 04:00:00 EDT 1998 · International Journal of Modern Physics B

DOI:https://doi.org/10.1142/S0217979298000855· OSTI ID:638391

Hartridge, A; Krishna, M G; Bhattacharya, A K ^[1]

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1. Univ. of Warwick, Coventry (United Kingdom)

Substituted ceria solid solutions have been shown as prime electrolytes in solid oxide fuel cell applications. There have been extensive studies on the ionic conductivity of these materials and the mechanisms driving the conductivity are now well understood. Yttria doped ceria compounds are of the highest ionically conducting compounds within the group and have been investigated in great detail over the last few years. Here, thin films of Ce{sub 1{minus}x}Y{sub x}O{sub 2{minus}y} where x ranges from 0 to 0.5 have been coated onto glass substrates using an inorganic sol-gel approach at low temperature. The lattice parameters from powder diffraction measurements were calculated and shown to be very close to those previously reported. Crystallite size measurements indicated that the films were nanocrystalline, the size deceasing as a function of dopant concentration. The films are transparent in the region 500 to 1,500 nm with very low optical losses. The film refractive index is dependent on the dopant concentration and peaks at an yttria concentration of x = 0.25 after treatment at 450 C, with a value of 1.79, which on increasing the yttria concentration to x = 0.50 deceases to 1.65 in the dispersion free region. The optical band gap is also dependent on the dopant concentration and is in the range 3.2 to 3.0 eV.

• OSTI ID: 638391
• Journal Information: International Journal of Modern Physics B, Journal Name: International Journal of Modern Physics B Journal Issue: 15 Vol. 12; ISSN IJPBEV; ISSN 0217-9792
• Country of Publication: United States
• Language: English

Related Subjects

30 DIRECT ENERGY CONVERSION
36 MATERIALS SCIENCE
CERIUM OXIDES
CRYSTAL STRUCTURE
DOPED MATERIALS
OPTICAL PROPERTIES
SOLID ELECTROLYTE FUEL CELLS
YTTRIUM OXIDES