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Regulate the microstructure and band gap of La2Ti2O7

  • Yueyi Li
  • Laiming Jiang
  • Qiang Chen
  • Jianguo ZhuEmail author
Article

Abstract

La2Ti2O7 (LTO) dry gel was obtained according to sol–gel technology. Considering that processing temperature could have effect on the microstructure and band gap of LTO, four temperature points, 500 °C, 850 °C, 1000 °C and 1200 °C were selected to dispose gel to acquire LTO powder. The results indicate that except the sample disposed at 500 °C, other three samples are univocal monoclinic structure with space group P21 which corresponds to the standard card 1950-ICSD. The crystallinity of LTO powders increases with the increase of processing temperature. The distortions of the LTO unit cell at ab projection plane first decrease and then increase. Adopting the UV–visible reflection spectrums analysis, the band gaps of LTO powders disposed at 500 °C, 850 °C, 1000 °C and 1200 °C are 3.82 eV, 3.99 eV, 4.08 eV and 3.94 eV, respectively.

Notes

Acknowledgements

This work was supported by the National Natural Science Foundation of China (No. 51332003) and Sichuan Science and Technology Program (2018G20140). The authors are grateful to Ms Wang Hui for SEM measurement.

Supplementary material

10854_2019_877_MOESM1_ESM.docx (19 kb)
Supplementary material 1 (DOCX 18 KB)

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© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  1. 1.College of Materials Science and EngineeringSichuan UniversityChengduChina

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