Regulate the microstructure and band gap of La2Ti2O7

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


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.



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)


  1. 1.
    L. Sun, J.F. Hu, F. Gao, X.W. Kong, H.W. Qin, M.H. Jiang, Room-temperature ferromagnetism and ferroelectricity of nanocrystalline La2Ti2O7. J. Alloys Compd. 502, 176–179 (2010)CrossRefGoogle Scholar
  2. 2.
    H.P. Ning, H.X. Yan, M.J. Reece, Piezoelectric strontium niobate and calcium niobate ceramics with super-high curie points. J. Am. Ceram. Soc. 93(5), 1409–1413 (2010)Google Scholar
  3. 3.
    H. Cheng, Z.G. Lu, Y. Liu, H.H. Yang, Y.Y. Gu, W. Li, Y.G. Tang, Sol-gel synthesis and photoluminescence characterization of La2Ti2O7: Eu3+ nanocrystals. Rare Met. 30(6), 602–606 (2011)CrossRefGoogle Scholar
  4. 4.
    Z.M. Shao, S. Saitzek, P. Roussel, O. Mentré, F.P. Gheorghiu, L. Mitoseriu, R. Desfeux, Structural and dielectric/ferroelectric properties of (La1 − xNdx)2Ti2O7 synthesized bysol-gelroute. J. Solid State Chem. 183, 1652–1662 (2010)CrossRefGoogle Scholar
  5. 5.
    G. Herrera, J. Jiménez-Mier, E. Chavira, Layered-structural monoclinic–orthorhombic perovskite La2Ti2O7 to orthorhombic LaTiO3 phase transition and their microstructure characterization. Mater. Charact. 89, 13–22 (2014)CrossRefGoogle Scholar
  6. 6.
    C. Bohnke, B. Regrag, F. Le Berre, J.L. Fourquet, N. Randrianantoandro, Comparison of pH sensitivity of lithium lanthanum titanate obtained by sol-gel synthesis and solid state chemistry. Solid State Ionics. 176, 73–80 (2005)CrossRefGoogle Scholar
  7. 7.
    Z.J. Ma, K.C. Wu, R.J. Sa, Q.H. Li, C. He, Z.G. Yi, Mechanism of enhanced photocatalytic activities on N-doped La2Ti2O7: an insight from density functional calculations. Int. J. Hydrog. Energy. 40, 980–989 (2015)CrossRefGoogle Scholar
  8. 8.
    R. Talebi, S. Safazade, Auto-combustion preparation and characterization of lanthanum titanate nanoparticles by using tyrosine as fuel and its photocatalyst application. J. Mater. Sci. Mater. Electron. 27, 8294–8298 (2016)CrossRefGoogle Scholar
  9. 9.
    P. Liu, J. Nisar, B. Pathak, R. Ahuja, Cationic–anionic mediated charge compensation on La2Ti2O7 for visible light photocatalysis. Phys. Chem. Chem. Phys. 15, 17150–17157 (2013)CrossRefGoogle Scholar
  10. 10.
    B.T. Yost, S.K. Cushing, F. Meng, J. Bright, D.A. Bas, N. Wu, A.D. Bristow, Investigation of band gap narrowing in nitrogen doped La2Ti2O7 with transient absorption spectroscopy. Phys. Chem. Chem. Phys. 17, 31039–31043 (2015)CrossRefGoogle Scholar
  11. 11.
    X.Y. Cai, J.Y. Zhang, M. Fujitsuka, T. Majima, Graphitic-C3N4 hybridized N-doped La2Ti2O7 two-dimensional layered composites as efficient visible-light-driven photocatalyst. Appl. Catal. B 202, 191–198 (2017)CrossRefGoogle Scholar
  12. 12.
    J.G. Zhu, Y.Y. Li, S.M. Bao, Preparation method of ultrahigh-Curie-temperature piezoelectric ceramic material. [P] Chinese. Public account: CN108046802A. Application account: CN201810011358Google Scholar
  13. 13.
    W.J. Zhang, Z. Ma, L. Du, L.L. Yang, X.J. Chen, H.B. He, Effects of calcination temperature on characterization and photocatalytic activity of La2Ti2O7 supported on HZSM-5 zeolite. J. Alloys Compd. 695, 3541–3546 (2017)CrossRefGoogle Scholar
  14. 14.
    Y.F. Zhang, J. Yuan, H.H. Gong, Y. Cao, K.W. Liu, H.M. Cao, H.J. Yan, J.G. Zhu, (00l)-facet-exposed planelike ABi2Nb2O9 (A = Ca, Sr, Ba) powders with a single-crystal grain for enhancement of photocatalytic activity. ACS Sustain. Chem. Eng. 6, 3840–3852 (2018)CrossRefGoogle Scholar

Copyright information

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

Authors and Affiliations

  1. 1.College of Materials Science and EngineeringSichuan UniversityChengduChina

Personalised recommendations