Phonons and relaxations in unfilled tetragonal tungsten-bronzes

Authors

  • Elena Buixaderas Institute of Physics, The Czech Academy of Sciences
  • Jan Dec Institute of Materials Science, University of Silesia, Pl-40-007, Katowice, Poland

Keywords:

PHONONS, DIELECTRIC RESPONSE, FERROELECTRIC OXIDES, RELAXOR MATERIALS, TETRAGONAL TUNGSTEN-BRONZES

Abstract

The lead-free unfilled tetragonal tungsten-bronzes SBN and CBN are investigated by Raman, infrared and high-frequency dielectric spectroscopies. The substitution in the different channels affects phonons as well as relaxations. Relaxations in SBN show similar qualitative behaviour on increasing Sr content and relaxor behaviour, but for the extreme relaxor samples all characteristic frequencies are higher with stronger contribution to the permittivity in the GHz-THz range is stronger. The presence of a soft anharmonic central mode in the THz range together with the slowing down of a relaxation from GHz to MHz ranges reveals the coexistence of displacive and order-disorder scenarios for the ferroelectric phase transition in this family.

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Published

2021-11-29

How to Cite

Buixaderas, E., & Dec, J. (2021). Phonons and relaxations in unfilled tetragonal tungsten-bronzes. OAJ Materials and Devices, 5(1). Retrieved from http://caip.co-ac.com/index.php/materialsanddevices/article/view/92

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