, Volume 25, Issue 2, pp 887–890 | Cite as

Study of the dynamics of lattice of copper selenide by the NMR method

  • N. N. BikkulovaEmail author
  • K. N. Mikhalev
  • R. A. Yakshibaev
  • G. R. Akmanova
  • L. V. Tsygankova
  • A. R. Kurbangulov
  • A. Kh. Kutov
  • A. V. Bikkulova
Original Paper


The article presents the results of investigations of copper selenide Cu1.75Se using the NMR method. The 77Se NMR spectrum for Cu1.75Se is a single line with full width at half maximum (FWHM) of 4 kHz at the temperature of 250 K. Within the temperature range of 200–450 K, the rates of transverse and longitudinal relaxation are equal. This phenomenon is mainly typical of a liquid, where the homonuclear dipole-dipole interaction is effectively averaged due to the Brownian motion of molecules. In this case, the main mechanism that averages the dipole-dipole interaction is the motion of copper ions. Below 200 K, copper ions are partially localized due to the phase transition, and the behavior of the spin-spin and spin-lattice relaxation rates (as well as their values) are different.


Copper selenide Superionic conductor NMR Nonstoichiometric composition Ionic conductivity Phase transitions Activation energy Crystal structure Lattice dynamics Phonon spectrum Low-energy modes 


Funding information

This work was supported by the Russian State Program (issue “Spin”, No. AAA-A18-118020290104-2). K.N. Mikhalev acknowledges the partial support of the project of the Ural Branch of RAS (No. 18-10-2-37), grant of the Russian Foundation for Fundamental Research (No. 18-32-00675).


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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • N. N. Bikkulova
    • 1
    Email author
  • K. N. Mikhalev
    • 2
  • R. A. Yakshibaev
    • 3
  • G. R. Akmanova
    • 3
  • L. V. Tsygankova
    • 1
  • A. R. Kurbangulov
    • 1
  • A. Kh. Kutov
    • 1
  • A. V. Bikkulova
    • 4
  1. 1.Sterlitamak branch of the Bashkir State UniversitySterlitamakRussian Federation
  2. 2.Institute of Metal PhysicsBranch of the Russian Academy of SciencesYekaterinburgRussian Federation
  3. 3.Bashkir State UniversityUfaRussian Federation
  4. 4.Moscow State UniversityMoscowRussian Federation

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