XPS Study of Superconducting LiTi_2O_4 and LiTi_{2-x}Cu_{x}O_4 Sol-Gel Derived Powders and Thin Films

• Authors: M. Łapinski , B. Kościelska , A. Winiarski , W. Sadowski
• Languages of publication: EN

Abstracts

EN

In this work X-ray photoelectron studies of lithium titanate and copper doped lithium titanate are presented. Both, powder and thin films samples were prepared by sol-gel method. After preparation, the samples were heated in argon atmosphere at various temperatures in a range from 500 °C to 600 °C for 20 h. The crystalline structure of the samples was investigated by X-ray diffraction, while the oxidation states of the elements were examined by X-ray photoelectron spectroscopy method. X-ray diffraction measurements confirmed spinel phase of all manufactured samples. However it is well known that electrical and superconducting properties of lithium titanate are strongly correlated not only with structure, but also with oxidation state of Ti ions. X-ray photoelectron spectroscopy investigations revealed mixture of Ti^{3+} and Ti^{4+} ions, although the Ti^{3+}/Ti^{4+} ratio is much smaller than 1/2 needed for superconductivity. In this work dependence between calcination temperature as well as amount of Cu dopant and Ti^{3+}/Ti^{4+} proportion are reported.

Keywords

EN

74.78.-w; 81.20.Fw

Discipline

• 74.78.-w: Superconducting films and low-dimensional structures
• 81.20.Fw: Sol-gel processing, precipitation(for reactions in sol-gels, see 82.33.Ln; for sol-gels as disperse system, see 82.70.Gg)

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2014
• Volume: 126
• Issue: 4a
• Pages: A-107-A-110

Dates

published

2014-10

Contributors

author

M. Łapinski

• Department of Solid State Physics, Gdańsk University of Technology, G. Narutowicza 11/12, 80-233 Gdańsk, Poland

author

B. Kościelska

• Department of Solid State Physics, Gdańsk University of Technology, G. Narutowicza 11/12, 80-233 Gdańsk, Poland

author

A. Winiarski

• A. Chełkowski Institute of Physics, University of Silesia, Uniwersytecka 4, 40-007 Katowice, Poland

author

W. Sadowski

• Department of Solid State Physics, Gdańsk University of Technology, G. Narutowicza 11/12, 80-233 Gdańsk, Poland

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Identifiers

DOI

10.12693/APhysPolA.126.A-107