Local structure of Ta-Re mixed oxide thin films studied by x-ray absorption spectroscopy

A. Kuzmin; R. Kalendarev; J. Purans

doi:10.1117/12.515709

8 August 2003 Local structure of Ta-Re mixed oxide thin films studied by x-ray absorption spectroscopy

A. Kuzmin, R. Kalendarev, J. Purans

Proceedings Volume 5122, Advanced Organic and Inorganic Optical Materials; (2003) https://doi.org/10.1117/12.515709
Event: 2003 Chapter books, 2003, Bellingham, WA, United States

Abstract

Mixed Ta-Re oxide thin films were synthesized for the first time by dc magnetron co-sputtering. Local environment around tantalum and rhenium atoms was studied by the Ta and Re L₃-edges x-ray absorption spectroscopy in pure Ta₂O₅ and mixed Ta-Re oxide thin films (Ta:Re = 50:50, 38:62, 20:80 as determined from the ratio of the Ta-to-Re absorption edges). It was found that rhenium atoms are four-fold coordinated by oxygen atoms with R(Re-O) = 1.74 ± 0.01 Å and the mean square relative displacement (MSRD) σ² = 0.0012 ± 0.0005 Å². In pure Ta₂O₅ thin film, tantalum ions are coordinated by six oxygen atoms at R(Ta-O) = 2.02 ± 0.01 Å with the MSRD σ² = 0.010 ± 0.001 Å². The addition of rhenium ions shortens the Ta-O distance by about 0.02 - 0.03 Å and makes the Ta-0 distances distribution slightly broader with the MSRD σ² approximately equals 0.013 ± 0.001 Å². The high frequency contribution in the Ta L₃-edge EXAFS signals, which is responsible in its Fourier transform for the peak beyond the first coordination shell, is due to the multiple-scattering effects within distorted [TaO₆] octahedron.

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A. Kuzmin, R. Kalendarev, and J. Purans "Local structure of Ta-Re mixed oxide thin films studied by x-ray absorption spectroscopy", Proc. SPIE 5122, Advanced Organic and Inorganic Optical Materials, (8 August 2003); https://doi.org/10.1117/12.515709

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